結果
| 問題 |
No.1320 Two Type Min Cost Cycle
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2024-09-23 20:41:58 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 342 ms / 2,000 ms |
| コード長 | 1,520 bytes |
| コンパイル時間 | 1,992 ms |
| コンパイル使用メモリ | 200,972 KB |
| 最終ジャッジ日時 | 2025-02-24 11:44:38 |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 57 |
コンパイルメッセージ
main.cpp: In function ‘void undir()’:
main.cpp:32:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
32 | scanf("%d%d", &n, &m);
| ~~~~~^~~~~~~~~~~~~~~~
main.cpp:34:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
34 | scanf("%d%d%d", &x, &y, &z);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~
main.cpp: In function ‘void dir()’:
main.cpp:50:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
50 | scanf("%d%d", &n, &m);
| ~~~~~^~~~~~~~~~~~~~~~
main.cpp:52:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
52 | scanf("%d%d%d", &x, &y, &z);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~
main.cpp: In function ‘int main()’:
main.cpp:69:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
69 | scanf("%d", &cas);
| ~~~~~^~~~~~~~~~~~
ソースコード
#include <bits/stdc++.h>
typedef long long LL;
const int N = 2e3 + 7;
const LL INF = 0x3f3f3f3f3f3f3f3f;
int n, m, pre[N];
LL dis[N];
std::vector<std::pair<int, int>> g[N];
void dijkstra(int r) {
std::priority_queue<std::pair<LL, int>, std::vector<std::pair<LL, int>>, std::greater<>> q;
memset(pre, 0, sizeof pre);
memset(dis, 0x3f, sizeof dis);
dis[r] = 0, q.push({0, r});
while(!q.empty()) {
auto [d, u] = q.top();
q.pop();
if(d != dis[u])
continue;
for(auto &&[v, w]: g[u])
if(dis[v] > d + w) {
dis[v] = d + w;
pre[v] = u;
q.push({dis[v], v});
}
}
}
void undir() {
scanf("%d%d", &n, &m);
for(int i = 1, x, y, z; i <= m; ++i) {
scanf("%d%d%d", &x, &y, &z);
g[x].emplace_back(y, z);
g[y].emplace_back(x, z);
}
LL ans = INF;
for(int r = 1; r <= n; ++r) {
dijkstra(r);
for(int u = 1; u <= n; ++u)
for(auto &&[v, w]: g[u])
if(pre[u] != v && pre[v] != u)
ans = std::min(ans, dis[u] + dis[v] + w);
}
printf("%lld\n", ans == INF ? -1 : ans);
}
void dir() {
scanf("%d%d", &n, &m);
for(int i = 1, x, y, z; i <= m; ++i) {
scanf("%d%d%d", &x, &y, &z);
g[x].emplace_back(y, z);
}
LL ans = INF;
for(int r = 1; r <= n; ++r) {
dijkstra(r);
for(int u = 1; u <= n; ++u)
for(auto &&[v, w]: g[u])
if(v == r)
ans = std::min(ans, dis[u] + w);
}
printf("%lld\n", ans == INF ? -1 : ans);
}
int main() {
int cas;
scanf("%d", &cas);
if(cas == 0)
undir();
else
dir();
return 0;
}