結果

問題 No.1320 Two Type Min Cost Cycle
ユーザー trineutron
提出日時 2020-12-17 11:17:59
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 312 ms / 2,000 ms
コード長 1,481 bytes
コンパイル時間 2,655 ms
コンパイル使用メモリ 207,696 KB
最終ジャッジ日時 2025-01-17 02:23:53
ジャッジサーバーID
(参考情報)
judge5 / judge3
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ファイルパターン 結果
sample AC * 3
other AC * 57
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
using weight = int64_t;
using edge = pair<int, weight>;
using vertice = vector<edge>;
using graph = vector<vertice>;
using cost = tuple<int64_t, int, int>;
int main() {
constexpr int64_t inf = 1e18;
int t, n, m;
cin >> t >> n >> m;
graph to(n);
for (int i = 0; i < m; i++) {
int u, v, w;
cin >> u >> v >> w;
u--; v--;
to.at(u).emplace_back(v, w);
if (t == 0) {
to.at(v).emplace_back(u, w);
}
}
int64_t ans = inf;
for (int i = 0; i < n; i++) {
vector<int64_t> d(n, inf);
priority_queue<cost, vector<cost>, greater<cost>> q;
q.emplace(0, i, -1);
while (not q.empty()) {
auto [dist, v, from] = q.top();
q.pop();
if (d.at(v) <= dist) continue;
if (dist) {
d.at(v) = dist;
}
for (auto next : to.at(v)) {
auto [next_v, next_w] = next;
if (next_v == from) continue;
int64_t next_dist = dist + next_w;
if (t == 0) {
ans = min(ans, d.at(next_v) + next_dist);
}
if (d.at(next_v) <= next_dist) continue;
q.emplace(next_dist, next_v, v);
}
}
ans = min(ans, d.at(i));
}
if (ans == inf) {
cout << -1 << endl;
} else {
cout << ans << endl;
}
}
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