{"id":5112,"date":"2026-09-19T05:56:37","date_gmt":"2026-09-19T05:56:37","guid":{"rendered":"https:\/\/otus.ru\/journal\/?p=5112"},"modified":"2026-09-25T15:42:55","modified_gmt":"2026-09-25T15:42:55","slug":"mnozhestva-v-c","status":"publish","type":"post","link":"https:\/\/otus.ru\/journal\/mnozhestva-v-c\/","title":{"rendered":"HashSet \u0438 SortedSet \u0432 C#: \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430, \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0438 \u0441\u043b\u043e\u0436\u043d\u043e\u0441\u0442\u044c"},"content":{"rendered":"

HashSet<\/strong> — \u044d\u0442\u043e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 System.Collections.Generic<\/code>, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0445\u0440\u0430\u043d\u0438\u0442 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0431\u0435\u0437 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u043e\u0440\u044f\u0434\u043a\u0430. SortedSet<\/strong> \u0442\u043e\u0436\u0435 \u0445\u0440\u0430\u043d\u0438\u0442 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b, \u043d\u043e \u0432\u0441\u0435\u0433\u0434\u0430 \u0432 \u043e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043f\u043e\u0440\u044f\u0434\u043a\u0435. \u041e\u0431\u0435 \u0440\u0435\u0430\u043b\u0438\u0437\u0443\u044e\u0442 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441 ISet<T><\/code> \u0438 \u0434\u0430\u044e\u0442 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0439 \u043d\u0430\u0431\u043e\u0440 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u043d\u0430\u0434 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430\u043c\u0438 — \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u043f\u0435\u0440\u0435\u0441\u0435\u0447\u0435\u043d\u0438\u0435, \u0440\u0430\u0437\u043d\u043e\u0441\u0442\u044c. \u0414\u0430\u043b\u044c\u0448\u0435 \u0440\u0430\u0437\u0431\u0435\u0440\u0435\u043c, \u0447\u0435\u043c \u043e\u043d\u0438 \u043e\u0442\u043b\u0438\u0447\u0430\u044e\u0442\u0441\u044f \u043e\u0442 List<T><\/code>, \u043a\u0430\u043a\u0438\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0438 \u043a\u0430\u043a\u0430\u044f \u0443 \u043d\u0438\u0445 \u0441\u043b\u043e\u0436\u043d\u043e\u0441\u0442\u044c.<\/p>\n

\n

\u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435<\/strong><\/p>\n

    \n
  1. HashSet, SortedSet \u0438 List: \u0432 \u0447\u0435\u043c \u0440\u0430\u0437\u043d\u0438\u0446\u0430<\/a><\/li>\n
  2. \u0421\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430 \u0438 \u0431\u0430\u0437\u043e\u0432\u044b\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438<\/a><\/li>\n
  3. Add \u043d\u0435 \u0431\u0440\u043e\u0441\u0430\u0435\u0442 \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u043d\u0430 \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u0435<\/a><\/li>\n
  4. \u041e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u043d\u0430\u0434 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430\u043c\u0438: UnionWith, IntersectWith, ExceptWith, SymmetricExceptWith<\/a><\/li>\n
  5. \u041f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043e\u0442\u043d\u043e\u0448\u0435\u043d\u0438\u0439 \u043c\u0435\u0436\u0434\u0443 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430\u043c\u0438<\/a><\/li>\n
  6. \u0421\u043b\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439<\/a><\/li>\n
  7. SortedSet: \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u0435 \u043a \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430\u043c<\/a><\/li>\n
  8. \u0412\u044b\u0432\u043e\u0434\u044b<\/a><\/li>\n
  9. \u0413\u0434\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \/ \u0441\u0432\u044f\u0437\u044c \u0441 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u043e\u0439<\/a><\/li>\n
  10. FAQ<\/a><\/li>\n<\/ol>\n<\/div>\n

    HashSet, SortedSet \u0438 List: \u0432 \u0447\u0435\u043c \u0440\u0430\u0437\u043d\u0438\u0446\u0430<\/h2>\n

    \u0412\u0441\u0435 \u0442\u0440\u0438 — \u043e\u0431\u043e\u0431\u0449\u0435\u043d\u043d\u044b\u0435 \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u0438 \u0434\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u043d\u0430\u0431\u043e\u0440\u0430 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 \u043e\u0434\u043d\u043e\u0433\u043e \u0442\u0438\u043f\u0430, \u043d\u043e \u0441 \u0440\u0430\u0437\u043d\u044b\u043c\u0438 \u0433\u0430\u0440\u0430\u043d\u0442\u0438\u044f\u043c\u0438.<\/p>\n

    List<T><\/code> \u0445\u0440\u0430\u043d\u0438\u0442 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0432 \u043f\u043e\u0440\u044f\u0434\u043a\u0435 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438 \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u0435\u0442 \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u044b. \u041f\u043e\u0438\u0441\u043a \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043d\u0430 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u0438\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430 — \u043b\u0438\u043d\u0435\u0439\u043d\u044b\u0439 \u043f\u0435\u0440\u0435\u0431\u043e\u0440.<\/p>\n

    HashSet<T><\/code> \u0445\u0440\u0430\u043d\u0438\u0442 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0432\u043e \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0439 \u0445\u0435\u0448-\u0442\u0430\u0431\u043b\u0438\u0446\u0435. \u041f\u043e\u0440\u044f\u0434\u043e\u043a \u043d\u0435 \u0433\u0430\u0440\u0430\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d (\u043d\u0435 \u0441\u043e\u0432\u043f\u0430\u0434\u0430\u0435\u0442 \u043d\u0438 \u0441 \u043f\u043e\u0440\u044f\u0434\u043a\u043e\u043c \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044f, \u043d\u0438 \u0441 \u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u043a\u043e\u0439) \u0438 \u043c\u043e\u0436\u0435\u0442 \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c\u0441\u044f \u043f\u043e\u0441\u043b\u0435 \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044f \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432. \u0414\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u044b \u0437\u0430\u043f\u0440\u0435\u0449\u0435\u043d\u044b: \u043f\u043e\u0432\u0442\u043e\u0440\u043d\u043e\u0435 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0441\u0442\u043e \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u043c\u0435\u043d\u044f\u0435\u0442.<\/p>\n

    SortedSet<T><\/code> \u0445\u0440\u0430\u043d\u0438\u0442 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0432 \u0441\u0431\u0430\u043b\u0430\u043d\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u0434\u0435\u0440\u0435\u0432\u0435 (\u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 BCL — \u043a\u0440\u0430\u0441\u043d\u043e-\u0447\u0435\u0440\u043d\u043e\u0435 \u0434\u0435\u0440\u0435\u0432\u043e). \u0414\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u044b \u0442\u043e\u0436\u0435 \u0437\u0430\u043f\u0440\u0435\u0449\u0435\u043d\u044b, \u043d\u043e \u043f\u0440\u0438 \u043f\u0435\u0440\u0435\u0431\u043e\u0440\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0432\u0441\u0435\u0433\u0434\u0430 \u0438\u0434\u0443\u0442 \u0432 \u043e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043f\u043e\u0440\u044f\u0434\u043a\u0435.<\/p>\n\n\n\n\n\n\n\n\n\n
    \u041a\u0440\u0438\u0442\u0435\u0440\u0438\u0439<\/th>\nList\\<T><\/th>\nHashSet\\<T><\/th>\nSortedSet\\<T><\/th>\n<\/tr>\n<\/thead>\n
    \u0414\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u044b<\/td>\n\u0440\u0430\u0437\u0440\u0435\u0448\u0435\u043d\u044b<\/td>\n\u0437\u0430\u043f\u0440\u0435\u0449\u0435\u043d\u044b<\/td>\n\u0437\u0430\u043f\u0440\u0435\u0449\u0435\u043d\u044b<\/td>\n<\/tr>\n
    \u041f\u043e\u0440\u044f\u0434\u043e\u043a \u043f\u0440\u0438 \u043f\u0435\u0440\u0435\u0431\u043e\u0440\u0435<\/td>\n\u043f\u043e\u0440\u044f\u0434\u043e\u043a \u0432\u0441\u0442\u0430\u0432\u043a\u0438<\/td>\n\u043d\u0435 \u0433\u0430\u0440\u0430\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d<\/td>\n\u043e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439<\/td>\n<\/tr>\n
    \u0412\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0435 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e<\/td>\n\u043c\u0430\u0441\u0441\u0438\u0432<\/td>\n\u0445\u0435\u0448-\u0442\u0430\u0431\u043b\u0438\u0446\u0430<\/td>\n\u0434\u0435\u0440\u0435\u0432\u043e (\u0441\u0431\u0430\u043b\u0430\u043d\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0435)<\/td>\n<\/tr>\n
    \u041d\u0443\u0436\u0435\u043d \u043b\u0438 IComparable \u0443 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432<\/td>\n\u043d\u0435\u0442<\/td>\n\u043d\u0435\u0442 (\u043d\u0443\u0436\u043d\u044b Equals\/GetHashCode)<\/td>\n\u0434\u0430, \u043b\u0438\u0431\u043e \u0441\u0432\u043e\u0439 IComparer\\<T><\/td>\n<\/tr>\n
    \u041a\u043e\u0433\u0434\u0430 \u0431\u0440\u0430\u0442\u044c<\/td>\n\u0432\u0430\u0436\u0435\u043d \u043f\u043e\u0440\u044f\u0434\u043e\u043a \u0432\u0441\u0442\u0430\u0432\u043a\u0438, \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u044b \u043d\u0443\u0436\u043d\u044b<\/td>\n\u0432\u0430\u0436\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0438 \u0431\u044b\u0441\u0442\u0440\u0430\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430<\/td>\n\u043d\u0443\u0436\u043d\u0430 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0438 \u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u043a\u0430 \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u0421\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430 \u0438 \u0431\u0430\u0437\u043e\u0432\u044b\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438<\/h2>\n

    \u041a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0442\u043e\u0440 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0435\u0442 IEnumerable<T><\/code> — \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u044b \u0438\u0437 \u0438\u0441\u0445\u043e\u0434\u043d\u043e\u0439 \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u0438 \u0441\u0445\u043b\u043e\u043f\u043d\u0443\u0442\u0441\u044f \u0441\u0430\u043c\u0438.<\/p>\n

    using<\/span> <\/span>System<\/span>;<\/span>\nusing<\/span> <\/span>System.Collections.Generic<\/span>;<\/span>\n\nvar<\/span> <\/span>numbers<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span> { <\/span>3<\/span>, <\/span>1<\/span>, <\/span>4<\/span>, <\/span>1<\/span>, <\/span>5<\/span> };<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>numbers<\/span>.<\/span>Count<\/span>);       <\/span>\/\/ 4 - \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442 1 \u043d\u0435 \u0434\u043e\u0431\u0430\u0432\u0438\u043b\u0441\u044f \u043f\u043e\u0432\u0442\u043e\u0440\u043d\u043e<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>numbers<\/span>.<\/span>Contains<\/span>(<\/span>4<\/span>)); <\/span>\/\/ True<\/span>\nnumbers<\/span>.<\/span>Remove<\/span>(<\/span>4<\/span>);<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>numbers<\/span>.<\/span>Contains<\/span>(<\/span>4<\/span>)); <\/span>\/\/ False<\/span><\/code><\/pre>\n
    \u0412\u044b\u0432\u043e\u0434:<\/p>\n
    4\nTrue\nFalse\n<\/code><\/pre>\n
    Add<\/code>, Remove<\/code> \u0438 Contains<\/code> \u0443 HashSet<T><\/code> \u0432 \u0441\u0440\u0435\u0434\u043d\u0435\u043c \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0442 \u0437\u0430 O(1) — \u0445\u0435\u0448-\u0442\u0430\u0431\u043b\u0438\u0446\u0430 \u0441\u0440\u0430\u0437\u0443 \u0432\u044b\u0447\u0438\u0441\u043b\u044f\u0435\u0442 \u044f\u0447\u0435\u0439\u043a\u0443 \u043f\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044e. \u0412 \u0445\u0443\u0434\u0448\u0435\u043c \u0441\u043b\u0443\u0447\u0430\u0435, \u043f\u0440\u0438 \u0431\u043e\u043b\u044c\u0448\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0445\u0435\u0448-\u043a\u043e\u043b\u043b\u0438\u0437\u0438\u0439, \u0441\u043b\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0434\u0435\u0433\u0440\u0430\u0434\u0438\u0440\u0443\u0435\u0442 \u0434\u043e O(n), \u043d\u043e \u043d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435 \u0434\u043b\u044f \u0440\u0430\u0437\u0443\u043c\u043d\u043e \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e GetHashCode<\/code> \u044d\u0442\u043e \u0440\u0435\u0434\u043a\u0438\u0439 \u0441\u043b\u0443\u0447\u0430\u0439.<\/p>\n
    Add \u043d\u0435 \u0431\u0440\u043e\u0441\u0430\u0435\u0442 \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u043d\u0430 \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u0435<\/h2>\n
    \u0427\u0430\u0441\u0442\u0430\u044f \u043e\u0448\u0438\u0431\u043a\u0430 — \u0440\u0435\u0448\u0438\u0442\u044c, \u0447\u0442\u043e \u043f\u043e\u0432\u0442\u043e\u0440\u043d\u043e\u0435 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0435\u0433\u043e \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430 \u043f\u0440\u0438\u0432\u0435\u0434\u0435\u0442 \u043a \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044e, \u0438 \u043e\u0431\u0435\u0440\u043d\u0443\u0442\u044c Add<\/code> \u0432 try\/catch.<\/p>\n
    var<\/span> <\/span>seen<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span> { <\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span> };<\/span>\ntry<\/span>\n{<\/span>\n    <\/span>seen<\/span>.<\/span>Add<\/span>(<\/span>2<\/span>);<\/span>\n    <\/span>Console<\/span>.<\/span>WriteLine<\/span>(<\/span>\"\u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043e\"<\/span>);<\/span>\n}<\/span>\ncatch<\/span> (<\/span>InvalidOperationException<\/span>)<\/span>\n{<\/span>\n    <\/span>Console<\/span>.<\/span>WriteLine<\/span>(<\/span>\"\u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442, \u044d\u043b\u0435\u043c\u0435\u043d\u0442 \u0443\u0436\u0435 \u0435\u0441\u0442\u044c\"<\/span>);<\/span>\n}<\/span><\/code><\/pre>\n
    \u0424\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442: \u0432 \u043a\u043e\u043d\u0441\u043e\u043b\u044c \u0432\u0441\u0435\u0433\u0434\u0430 \u043f\u043e\u043f\u0430\u0434\u0430\u0435\u0442 «\u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043e» — \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435 \u043d\u0435 \u0431\u0440\u043e\u0441\u0430\u0435\u0442\u0441\u044f \u043d\u0438 \u0440\u0430\u0437\u0443, \u043c\u0435\u0442\u043e\u0434 Add<\/code> \u043d\u0430 \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u0435 \u043f\u0440\u043e\u0441\u0442\u043e \u043c\u043e\u043b\u0447\u0430 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 false<\/code> \u0438 \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u043c\u0435\u043d\u044f\u0435\u0442 \u0432 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0435.<\/p>\n
    \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 — \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0442\u044c \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 Add<\/code>, \u043e\u043d\u043e \u0442\u0438\u043f\u0430 bool<\/code>:<\/p>\n
    bool<\/span> <\/span>added<\/span> <\/span>=<\/span> <\/span>seen<\/span>.<\/span>Add<\/span>(<\/span>2<\/span>);<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>added<\/span> <\/span>?<\/span> <\/span>\"\u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043e\"<\/span> : <\/span>\"\u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442, \u044d\u043b\u0435\u043c\u0435\u043d\u0442 \u0443\u0436\u0435 \u0435\u0441\u0442\u044c\"<\/span>);<\/span><\/code><\/pre>\n
    \u0422\u043e \u0436\u0435 \u0441\u0430\u043c\u043e\u0435 \u0432\u0435\u0440\u043d\u043e \u0434\u043b\u044f SortedSet<T>.Add<\/code> — \u0441\u0438\u0433\u043d\u0430\u0442\u0443\u0440\u0430 \u0438 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u043f\u0440\u0438 \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u0435 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0435.<\/p>\n
    \u041e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u043d\u0430\u0434 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430\u043c\u0438: UnionWith, IntersectWith, ExceptWith, SymmetricExceptWith<\/h2>\n
    \u042d\u0442\u0438 \u043c\u0435\u0442\u043e\u0434\u044b \u043c\u0435\u043d\u044f\u044e\u0442 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e, \u043d\u0430 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u0432\u044b\u0437\u0432\u0430\u043d\u044b, «\u043d\u0430 \u043c\u0435\u0441\u0442\u0435» — \u0435\u0441\u043b\u0438 \u0438\u0441\u0445\u043e\u0434\u043d\u044b\u0435 \u043d\u0430\u0431\u043e\u0440\u044b \u043d\u0443\u0436\u043d\u043e \u0441\u043e\u0445\u0440\u0430\u043d\u0438\u0442\u044c, \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u043a\u043e\u043f\u0438\u0440\u0443\u044e\u0442 \u0438\u0445 \u0447\u0435\u0440\u0435\u0437 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0442\u043e\u0440.<\/p>\n
    using<\/span> <\/span>System<\/span>;<\/span>\nusing<\/span> <\/span>System.Collections.Generic<\/span>;<\/span>\nusing<\/span> <\/span>System.Linq<\/span>;<\/span>\n\nvar<\/span> <\/span>a<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span> { <\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span>, <\/span>4<\/span> };<\/span>\nvar<\/span> <\/span>b<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span> { <\/span>3<\/span>, <\/span>4<\/span>, <\/span>5<\/span>, <\/span>6<\/span> };<\/span>\n\nvar<\/span> <\/span>union<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span>(<\/span>a<\/span>);<\/span>\nunion<\/span>.<\/span>UnionWith<\/span>(<\/span>b<\/span>);<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>string<\/span>.<\/span>Join<\/span>(<\/span>\", \"<\/span>, <\/span>union<\/span>.<\/span>OrderBy<\/span>(<\/span>x<\/span> <\/span>=><\/span> <\/span>x<\/span>)));<\/span>\n\nvar<\/span> <\/span>intersection<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span>(<\/span>a<\/span>);<\/span>\nintersection<\/span>.<\/span>IntersectWith<\/span>(<\/span>b<\/span>);<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>string<\/span>.<\/span>Join<\/span>(<\/span>\", \"<\/span>, <\/span>intersection<\/span>.<\/span>OrderBy<\/span>(<\/span>x<\/span> <\/span>=><\/span> <\/span>x<\/span>)));<\/span>\n\nvar<\/span> <\/span>difference<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span>(<\/span>a<\/span>);<\/span>\ndifference<\/span>.<\/span>ExceptWith<\/span>(<\/span>b<\/span>);<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>string<\/span>.<\/span>Join<\/span>(<\/span>\", \"<\/span>, <\/span>difference<\/span>.<\/span>OrderBy<\/span>(<\/span>x<\/span> <\/span>=><\/span> <\/span>x<\/span>)));<\/span>\n\nvar<\/span> <\/span>symmetric<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span>(<\/span>a<\/span>);<\/span>\nsymmetric<\/span>.<\/span>SymmetricExceptWith<\/span>(<\/span>b<\/span>);<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>string<\/span>.<\/span>Join<\/span>(<\/span>\", \"<\/span>, <\/span>symmetric<\/span>.<\/span>OrderBy<\/span>(<\/span>x<\/span> <\/span>=><\/span> <\/span>x<\/span>)));<\/span><\/code><\/pre>\n
    \u0412\u044b\u0432\u043e\u0434 (\u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u043e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u044b \u0447\u0435\u0440\u0435\u0437 OrderBy<\/code> \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0434\u043b\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u0430 — \u0441\u0430\u043c HashSet<T><\/code> \u043f\u043e\u0440\u044f\u0434\u043e\u043a \u043d\u0435 \u0433\u0430\u0440\u0430\u043d\u0442\u0438\u0440\u0443\u0435\u0442):<\/p>\n
    1, 2, 3, 4, 5, 6\n3, 4\n1, 2\n1, 2, 5, 6\n<\/code><\/pre>\n
    UnionWith<\/code> — \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 (\u0432\u0441\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u0445\u043e\u0442\u044f \u0431\u044b \u043e\u0434\u043d\u043e\u0433\u043e \u043d\u0430\u0431\u043e\u0440\u0430). IntersectWith<\/code> — \u043f\u0435\u0440\u0435\u0441\u0435\u0447\u0435\u043d\u0438\u0435 (\u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b, \u043e\u0431\u0449\u0438\u0435 \u0434\u043b\u044f \u043e\u0431\u043e\u0438\u0445). ExceptWith<\/code> — \u0440\u0430\u0437\u043d\u043e\u0441\u0442\u044c (\u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b a<\/code>, \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043d\u0435\u0442 \u0432 b<\/code>; \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f \u043d\u0435\u0441\u0438\u043c\u043c\u0435\u0442\u0440\u0438\u0447\u043d\u0430\u044f, \u043f\u043e\u0440\u044f\u0434\u043e\u043a \u0432\u044b\u0437\u043e\u0432\u0430 \u0432\u0430\u0436\u0435\u043d). SymmetricExceptWith<\/code> — \u0441\u0438\u043c\u043c\u0435\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0440\u0430\u0437\u043d\u043e\u0441\u0442\u044c: \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0435\u0441\u0442\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u043e\u0434\u043d\u043e\u043c \u0438\u0437 \u0434\u0432\u0443\u0445 \u043d\u0430\u0431\u043e\u0440\u043e\u0432.<\/p>\n
    \u041f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043e\u0442\u043d\u043e\u0448\u0435\u043d\u0438\u0439 \u043c\u0435\u0436\u0434\u0443 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0430\u043c\u0438<\/h2>\n
    IsSubsetOf<\/code>, IsSupersetOf<\/code>, Overlaps<\/code> \u0438 SetEquals<\/code> \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u043c\u0435\u043d\u044f\u044e\u0442 \u0432 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u0435 — \u0442\u043e\u043b\u044c\u043a\u043e \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u044e\u0442 bool<\/code>.<\/p>\n
    var<\/span> <\/span>small<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span> { <\/span>1<\/span>, <\/span>2<\/span> };<\/span>\nvar<\/span> <\/span>big<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>HashSet<\/span><<\/span>int<\/span>><\/span> { <\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span>, <\/span>4<\/span> };<\/span>\n\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>small<\/span>.<\/span>IsSubsetOf<\/span>(<\/span>big<\/span>));           <\/span>\/\/ True<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>big<\/span>.<\/span>IsSupersetOf<\/span>(<\/span>small<\/span>));         <\/span>\/\/ True<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>small<\/span>.<\/span>Overlaps<\/span>(<\/span>new<\/span>[] { <\/span>2<\/span>, <\/span>99<\/span> })); <\/span>\/\/ True, \u043e\u0431\u0449\u0438\u0439 \u044d\u043b\u0435\u043c\u0435\u043d\u0442 - 2<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>small<\/span>.<\/span>SetEquals<\/span>(<\/span>new<\/span>[] { <\/span>2<\/span>, <\/span>1<\/span> })); <\/span>\/\/ True, \u043f\u043e\u0440\u044f\u0434\u043e\u043a \u0430\u0440\u0433\u0443\u043c\u0435\u043d\u0442\u0430 \u043d\u0435 \u0432\u0430\u0436\u0435\u043d<\/span><\/code><\/pre>\n
    SetEquals<\/code> \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435, \u0430 \u043d\u0435 \u043f\u043e\u0440\u044f\u0434\u043e\u043a \u0438 \u043d\u0435 \u0442\u0438\u043f \u043a\u043e\u043b\u043b\u0435\u043a\u0446\u0438\u0438 — HashSet<int><\/code> \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0440\u0430\u0432\u0435\u043d \u043e\u0431\u044b\u0447\u043d\u043e\u043c\u0443 \u043c\u0430\u0441\u0441\u0438\u0432\u0443 \u043f\u043e \u0441\u043e\u0441\u0442\u0430\u0432\u0443 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432.<\/p>\n
    \u0421\u043b\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439<\/h2>\n\n\n\n\n\n\n\n\n
    \u041e\u043f\u0435\u0440\u0430\u0446\u0438\u044f<\/th>\nHashSet\\<T><\/th>\nSortedSet\\<T><\/th>\nList\\<T> (\u0434\u043b\u044f \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044f)<\/th>\n<\/tr>\n<\/thead>\n
    Add<\/td>\nO(1) \u0432 \u0441\u0440\u0435\u0434\u043d\u0435\u043c<\/td>\nO(log n)<\/td>\nO(1) \u0430\u043c\u043e\u0440\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e \u0432 \u043a\u043e\u043d\u0435\u0446, O(n) \u0435\u0441\u043b\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0442\u044c \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442<\/td>\n<\/tr>\n
    Contains<\/td>\nO(1) \u0432 \u0441\u0440\u0435\u0434\u043d\u0435\u043c<\/td>\nO(log n)<\/td>\nO(n)<\/td>\n<\/tr>\n
    Remove<\/td>\nO(1) \u0432 \u0441\u0440\u0435\u0434\u043d\u0435\u043c<\/td>\nO(log n)<\/td>\nO(n)<\/td>\n<\/tr>\n
    \u041f\u0435\u0440\u0435\u0431\u043e\u0440 \u0432\u0441\u0435\u0445 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432<\/td>\nO(n)<\/td>\nO(n), \u0432 \u043e\u0442\u0441\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043f\u043e\u0440\u044f\u0434\u043a\u0435<\/td>\nO(n), \u0432 \u043f\u043e\u0440\u044f\u0434\u043a\u0435 \u0432\u0441\u0442\u0430\u0432\u043a\u0438<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \u0413\u0440\u0430\u043d\u0438\u0446\u0430 \u0443 HashSet: O(1) — \u044d\u0442\u043e \u0441\u0440\u0435\u0434\u043d\u0438\u0439 \u0441\u043b\u0443\u0447\u0430\u0439 \u043f\u0440\u0438 \u0440\u0430\u0432\u043d\u043e\u043c\u0435\u0440\u043d\u043e\u043c \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0438 \u0445\u0435\u0448\u0435\u0439. \u0415\u0441\u043b\u0438 \u0443 \u0442\u0438\u043f\u0430 \u043f\u043b\u043e\u0445\u043e \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d GetHashCode<\/code> (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043e\u043d \u0432\u0441\u0435\u0433\u0434\u0430 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u043e\u0434\u043d\u043e \u0438 \u0442\u043e \u0436\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435), \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0434\u0435\u0433\u0440\u0430\u0434\u0438\u0440\u0443\u044e\u0442 \u0434\u043e O(n) — \u0432\u0441\u0435 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u044b \u043f\u043e\u043f\u0430\u0434\u0430\u044e\u0442 \u0432 \u043e\u0434\u043d\u0443 \u044f\u0447\u0435\u0439\u043a\u0443.<\/p>\n
    SortedSet: \u0442\u0440\u0435\u0431\u043e\u0432\u0430\u043d\u0438\u0435 \u043a \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430\u043c<\/h2>\n
    SortedSet<T><\/code> \u043d\u0443\u0436\u043d\u043e \u0437\u043d\u0430\u0442\u044c, \u043a\u0430\u043a \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0442\u044c \u0434\u0432\u0430 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430, \u0447\u0442\u043e\u0431\u044b \u0434\u0435\u0440\u0436\u0430\u0442\u044c \u043f\u043e\u0440\u044f\u0434\u043e\u043a. \u0415\u0441\u043b\u0438 \u0442\u0438\u043f \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0443\u0435\u0442 IComparable<T><\/code> (\u043a\u0430\u043a \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u044b\u0435 int<\/code>, string<\/code>, DateTime<\/code>), \u043c\u043e\u0436\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e \u0431\u0435\u0437 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u043d\u0430\u0441\u0442\u0440\u043e\u0435\u043a. \u0415\u0441\u043b\u0438 \u043d\u0435\u0442 — \u043d\u0443\u0436\u043d\u043e \u043f\u0435\u0440\u0435\u0434\u0430\u0442\u044c IComparer<T><\/code> \u0432 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0442\u043e\u0440 \u044f\u0432\u043d\u043e.<\/p>\n
    public<\/span> <\/span>class<\/span> <\/span>Point<\/span>\n{<\/span>\n    <\/span>public<\/span> <\/span>int<\/span> <\/span>X<\/span>, <\/span>Y<\/span>;<\/span>\n    <\/span>public<\/span> <\/span>Point<\/span>(<\/span>int<\/span> <\/span>x<\/span>, <\/span>int<\/span> <\/span>y<\/span>) { <\/span>X<\/span> <\/span>=<\/span> <\/span>x<\/span>; <\/span>Y<\/span> <\/span>=<\/span> <\/span>y<\/span>; }<\/span>\n}<\/span>\n\nvar<\/span> <\/span>points<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>SortedSet<\/span><<\/span>Point<\/span>><\/span>();<\/span>\npoints<\/span>.<\/span>Add<\/span>(<\/span>new<\/span> <\/span>Point<\/span>(<\/span>1<\/span>, <\/span>1<\/span>));<\/span>\npoints<\/span>.<\/span>Add<\/span>(<\/span>new<\/span> <\/span>Point<\/span>(<\/span>2<\/span>, <\/span>2<\/span>));<\/span><\/code><\/pre>\n
    \u0424\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442: \u0432\u0442\u043e\u0440\u043e\u0439 Add<\/code> \u0437\u0430\u0432\u0435\u0440\u0448\u0438\u0442\u0441\u044f \u0438\u0441\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435\u043c ArgumentException<\/code> (\u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u043e \u0442\u043e\u043c, \u0447\u0442\u043e \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u043e\u0431\u044a\u0435\u043a\u0442\u044b \u0434\u043e\u043b\u0436\u043d\u044b \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u044b\u0432\u0430\u0442\u044c IComparable<\/code>) — Point<\/code> \u043d\u0435 \u0440\u0435\u0430\u043b\u0438\u0437\u0443\u0435\u0442 IComparable<Point><\/code>, \u0438 \u043a\u043e\u043c\u043f\u0430\u0440\u0430\u0442\u043e\u0440 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e Comparer<T>.Default<\/code> \u043d\u0435 \u043c\u043e\u0436\u0435\u0442 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u043f\u043e\u0440\u044f\u0434\u043e\u043a \u0434\u0432\u0443\u0445 \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432.<\/p>\n
    \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 — \u043f\u0435\u0440\u0435\u0434\u0430\u0442\u044c \u043a\u043e\u043c\u043f\u0430\u0440\u0430\u0442\u043e\u0440 \u0432 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0442\u043e\u0440:<\/p>\n
    var<\/span> <\/span>points<\/span> <\/span>=<\/span> <\/span>new<\/span> <\/span>SortedSet<\/span><<\/span>Point<\/span>><\/span>(<\/span>Comparer<\/span><<\/span>Point<\/span>><\/span>.<\/span>Create<\/span>((<\/span>p1<\/span>, <\/span>p2<\/span>) <\/span>=><\/span>\n{<\/span>\n    <\/span>int<\/span> <\/span>byX<\/span> <\/span>=<\/span> <\/span>p1<\/span>.<\/span>X<\/span>.<\/span>CompareTo<\/span>(<\/span>p2<\/span>.<\/span>X<\/span>);<\/span>\n    <\/span>return<\/span> <\/span>byX<\/span> <\/span>!=<\/span> <\/span>0<\/span> <\/span>?<\/span> <\/span>byX<\/span> : <\/span>p1<\/span>.<\/span>Y<\/span>.<\/span>CompareTo<\/span>(<\/span>p2<\/span>.<\/span>Y<\/span>);<\/span>\n}));<\/span>\n\npoints<\/span>.<\/span>Add<\/span>(<\/span>new<\/span> <\/span>Point<\/span>(<\/span>1<\/span>, <\/span>1<\/span>));<\/span>\npoints<\/span>.<\/span>Add<\/span>(<\/span>new<\/span> <\/span>Point<\/span>(<\/span>2<\/span>, <\/span>2<\/span>));<\/span>\nConsole<\/span>.<\/span>WriteLine<\/span>(<\/span>points<\/span>.<\/span>Count<\/span>); <\/span>\/\/ 2<\/span><\/code><\/pre>\n
    \u0412\u044b\u0432\u043e\u0434\u044b<\/h2>\n