結果
問題 | No.416 旅行会社 |
ユーザー |
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提出日時 | 2019-03-17 19:41:08 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 653 ms / 4,000 ms |
コード長 | 2,951 bytes |
コンパイル時間 | 931 ms |
コンパイル使用メモリ | 73,596 KB |
最終ジャッジ日時 | 2025-01-06 22:34:55 |
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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ファイルパターン | 結果 |
---|---|
other | AC * 21 |
コンパイルメッセージ
main.cpp: In function ‘int main()’: main.cpp:90:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 90 | scanf("%zu %zu %zu", &N, &M, &Q); | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:96:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 96 | scanf("%zu %zu", &p.first, &p.second); | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:104:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 104 | scanf("%zu %zu", &p.first, &p.second); | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ソースコード
#include <cstdio> #include <cstdint> #include <cassert> #include <vector> #include <utility> #include <algorithm> #include <set> #include <tuple> template <class Tp> class semi_persistent_array { using Node = std::pair<size_t, Tp>; // <timestamp, value> std::vector<std::vector<Node>> entity; size_t last = 0; public: semi_persistent_array(size_t n, Tp v=Tp()): entity(n, std::vector<Node>(1, {0, v})) {} void update(size_t i, Tp x, size_t t) { assert(last <= t); last = t; if (entity[i].back().first == t) { entity[i].back().second = x; } else { assert(entity[i].back().first < t); entity[i].emplace_back(t, x); } } Tp get(size_t i, size_t t=-1) const { if (entity[i].back().first <= t) { // most-frequent case return entity[i].back().second; } size_t lb = 0; size_t ub = entity[i].size(); while (ub-lb > 1) { size_t mid = (lb+ub)>>1; ((entity[i][mid].first <= t)? lb:ub) = mid; } return entity[i][lb].second; } }; class semi_persistent_union_find { semi_persistent_array<intmax_t> tree; size_t last = 0; size_t find_root(size_t v, size_t t) const { intmax_t pv = tree.get(v, t); while (pv >= 0) { v = pv; pv = tree.get(pv, t); } return v; } public: semi_persistent_union_find(size_t n): tree(n, -1) {} bool unite(size_t u, size_t v, size_t t=-1) { if (t+1 != 0) { assert(last <= t); last = t; } u = find_root(u, t); v = find_root(v, t); if (u == v) return false; size_t su = -tree.get(u, t); size_t sv = -tree.get(v, t); if (su == sv) { tree.update(v, -sv-1, t); } else if (su > sv) { std::swap(u, v); } tree.update(u, v, t); return true; } bool connected(size_t u, size_t v, size_t t=-1) const { return find_root(u, t) == find_root(v, t); } }; int main() { size_t N, M, Q; scanf("%zu %zu %zu", &N, &M, &Q); using edge = std::pair<size_t, size_t>; std::vector<edge> ab(M); for (auto& p: ab) { scanf("%zu %zu", &p.first, &p.second); --p.first; --p.second; } std::vector<edge> cd(Q); std::set<edge> es; for (auto& p: cd) { scanf("%zu %zu", &p.first, &p.second); --p.first; --p.second; es.emplace(p.first, p.second); } semi_persistent_union_find uf(N); for (const auto& p: ab) { size_t a, b; std::tie(a, b) = p; if (es.count({a, b})) continue; uf.unite(a, b, 0); } for (size_t i = Q; i--;) { size_t c, d; std::tie(c, d) = cd[i]; uf.unite(c, d, Q-i); } for (size_t i = 1; i < N; ++i) { if (!uf.connected(0, i, Q)) { puts("0"); continue; } if (uf.connected(0, i, 0)) { puts("-1"); continue; } size_t lb = 0; size_t ub = Q; while (ub-lb > 1) { size_t mid = (lb+ub) >> 1; (uf.connected(0, i, mid)? ub:lb) = mid; } printf("%zu\n", Q-lb); } }