{"id":1092,"date":"2024-08-15T09:00:00","date_gmt":"2024-08-15T01:00:00","guid":{"rendered":"https:\/\/seanxd.com\/?p=1092"},"modified":"2024-07-31T10:57:57","modified_gmt":"2024-07-31T02:57:57","slug":"zerojudge-f677","status":"publish","type":"post","link":"https:\/\/seanxd.com\/zh\/zerojudge-f677\/","title":{"rendered":"ZeroJudge F677: \u4e26\u67e5\u96c6\u7df4\u7fd2"},"content":{"rendered":"\n\n\n

\u6709 N \u500b\u4eba\uff0c\u7de8\u865f 0\uff5eN-1\uff0c0 \u865f\u67d3\u4e0a\u4e86\u56b4\u91cd\u7684\u50b3\u67d3\u6027\u75be\u75c5\uff0c\u6709\u8207 0 \u76f4\u63a5\u6216\u9593\u63a5\u63a5\u89f8\u7684\u4eba\u90fd\u9700\u8981\u9694\u96e2\u3002\u8acb\u554f\u6709\u591a\u5c11\u4eba\u9700\u8981\u9694\u96e2?<\/p>\n\n\n\n

\u7bc4\u4f8b\u6e2c\u8cc7<\/h2>\n\n\n\n
\u7bc4\u4f8b\u8f38\u5165<\/th>\u7bc4\u4f8b\u8f38\u51fa<\/th><\/tr><\/thead>
\u7b2c\u4e00\u884c\u6709\u5169\u500b\u6578\u5b57 N \u548c M\uff0c\u63a5\u4e0b\u4f86\u6709 M \u884c\uff0c\u6bcf\u4e00\u884c\u6709 2 \u500b\u6578\u5b57 A \u548c B\uff0c\u4ee3\u8868 A \u548c B \u6709\u63a5\u89f8\u904e\u3002<\/td>\u8f38\u51fa\u6709\u591a\u5c11\u4eba\u9700\u8981\u9694\u96e2\u3002<\/td><\/tr>
5 3
1 0
0 3
2 4<\/td>		3<\/td><\/tr><\/tbody><\/table>
ZeroJudge F677 \u7bc4\u4f8b\u6e2c\u8cc7<\/figcaption><\/figure>\n\n\n\n

\u89e3\u984c\u601d\u8def<\/h2>\n\n\n\n

\u4f7f\u7528 Map \u4f86\u7d00\u9304\u6bcf\u4e00\u500b\u4eba\u7684\u6700\u5e95\u5c64\u63a5\u89f8\u8005\uff0c\u4e00\u958b\u59cb\u5c07\u6240\u6709\u4eba\u7684 Map \u503c\u90fd\u9810\u8a2d\u70ba -1\u3002<\/p>\n\n\n\n

\u5ba3\u544a\u4e00\u500b\u51fd\u5f0f findEnd\uff0c\u9700\u8981\u4e00\u500b\u53c3\u6578 N\uff0c\u5982\u679c N == -1 || Map[N] == -1\uff0creturn N\u3002\u5982\u679c Map[N] == N\uff0creturn N\u3002\u5426\u5247 return findEnd(Map[N])\u3002<\/p>\n\n\n\n

\u8f38\u5165\u8cc7\u6599\u6642\uff0c\u5982\u679c\u5169\u500b\u4eba\u90fd\u6c92\u6709\u63a5\u89f8\u53f2\uff0c\u5247\u8981\u5224\u65b7\u5176\u4e2d\u662f\u5426\u6709 0\uff0c\u5982\u679c\u6709\u7684\u8a71\u5c31\u8981\u5c07\u53e6\u4e00\u500b\u4eba\u7684 Map \u503c\u8a2d\u5b9a\u70ba 0\u3002\u5982\u679c\u5169\u500b\u4eba\u90fd\u6709\u63a5\u89f8\u53f2\uff0c\u5247\u8981\u5224\u65b7\u5176\u4e2d\u6709\u6c92\u6709 0\uff0c\u5982\u679c\u6709 0 \u7684\u8a71\u5c31\u5c07\u53e6\u4e00\u500b\u4eba\u7684 Map[findEnd(\u53e6\u4e00\u500b\u4eba)] \u8a2d\u70ba 0\uff0c\u5426\u5247\u5c31\u5c07\u5176\u8a2d\u70ba findEnd(\u53e6\u4e00\u500b\u4eba)\u3002\u5982\u679c\u662f\u4e00\u500b\u6709\u4e00\u500b\u6c92\u6709\uff0c\u5247\u5c07\u6c92\u6709\u7684\u4eba\u7684 Map \u503c\u8a2d\u5b9a\u6210 findEnd(\u53e6\u4e00\u500b\u4eba)\u3002<\/p>\n\n\n\n

\u6700\u5f8c\u8dd1\u4e00\u500b\u5f9e 0 \u5230 N-1 \u7684\u8ff4\u5708\uff0c\u5982\u679c findEnd(Map[\u76ee\u524d\u6578\u5b57]) == 0\uff0c\u5c31\u5c07\u7b54\u6848 +1\u3002<\/p>\n\n\n\n

\u7bc4\u4f8b\u7a0b\u5f0f\u78bc\uff0dZeroJudge F677: \u4e26\u67e5\u96c6\u7df4\u7fd2<\/a><\/h3>\n\n\n\n
#include <iostream>\n#include <map>\nusing namespace std;\n\nmap<int, int>MAP;\n\nvoid virus(const int a, const int b) {\n    if (MAP[a] == -1 && MAP[b] == -1) {\n        if (b == 0) {\n            MAP[a] = b;\n            MAP[b] = b;\n        }\n        else {\n            MAP[a] = a;\n            MAP[b] = a;\n        }\n    }\n    else if (MAP[a] != -1 && MAP[b] != -1) {\n        if (findEnd(MAP[b]) == 0) MAP[findEnd(a)] = 0;\n        else MAP[findEnd(b)] = findEnd(a);\n    }\n    else {\n        if (MAP[a] != -1) MAP[b] = findEnd(a);\n        else MAP[a] = findEnd(b);\n    }\n}\n\nint main() {\n    cin.sync_with_stdio(0);\n    cin.tie(0);\n    int N, M, ans = 0;\n    cin >> N >> M;\n    for (int i = 1; i<N; i++) MAP[i] = -1;\n    for (int i = 0; i<M; i++) {\n        int a, b;\n        cin >> a >> b;\n        virus(a, b);\n    }\n    for (int i = 0; i<N; i++) {\n        if (findEnd(MAP[i]) == 0) {\n            ans++;\n        }\n    }\n    cout << ans << "\\n";\n}\n\n\/\/ZeroJudge F677\n\/\/Dr. SeanXD<\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"
\u6709 N \u500b\u4eba\uff0c\u7de8\u865f 0\uff5eN-1\uff0c0 \u865f\u67d3\u4e0a\u4e86\u56b4\u91cd\u7684\u50b3\u67d3\u6027\u75be\u75c5\uff0c\u6709\u8207 0 \u76f4\u63a5\u6216\u9593\u63a5\u63a5\u89f8\u7684\u4eba […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","footnotes":""},"categories":[29],"tags":[14,8,9],"class_list":["post-1092","post","type-post","status-publish","format-standard","hentry","category-zerojudge-","tag-map","tag-8","tag-9"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/posts\/1092","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/comments?post=1092"}],"version-history":[{"count":7,"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/posts\/1092\/revisions"}],"predecessor-version":[{"id":1146,"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/posts\/1092\/revisions\/1146"}],"wp:attachment":[{"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/media?parent=1092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/categories?post=1092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/seanxd.com\/zh\/wp-json\/wp\/v2\/tags?post=1092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}