結果

問題 No.2805 Go to School
ユーザー tnakao0123
提出日時 2024-07-15 15:08:49
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 270 ms / 2,000 ms
コード長 1,451 bytes
コンパイル時間 746 ms
コンパイル使用メモリ 63,668 KB
最終ジャッジ日時 2025-02-23 15:46:39
ジャッジサーバーID
(参考情報)
judge1 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 4
other AC * 35
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:60:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   60 |   scanf("%d%d%d%d%d", &n, &m, &l, &s, &e);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:64:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   64 |     scanf("%d%d%d", &u, &v, &t);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
main.cpp:70:36: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   70 |   for (int i = 0; i < l; i++) scanf("%d", ts + i), ts[i]--;
      |                               ~~~~~^~~~~~~~~~~~~~

ソースコード

diff #
プレゼンテーションモードにする

/* -*- coding: utf-8 -*-
*
* 2805.cc: No.2805 Go to School - yukicoder
*/
#include<cstdio>
#include<vector>
#include<queue>
#include<algorithm>
#include<utility>
using namespace std;
/* constant */
const int MAX_N = 200000;
const long long LINF = 1LL << 62;
/* typedef */
using ll = long long;
using pii = pair<int,int>;
using pli = pair<ll,int>;
using vpii = vector<pii>;
/* global variables */
vpii nbrs[MAX_N];
int ts[MAX_N];
ll ds0[MAX_N], ds1[MAX_N];
/* subroutines */
void dijkstra(int n, int st, ll ds[]) {
fill(ds, ds + n, LINF);
ds[st] = 0;
priority_queue<pli> q;
q.push({0, st});
while (! q.empty()) {
auto [ud, u] = q.top(); q.pop();
ud = -ud;
if (ds[u] != ud) continue;
for (auto [v, t]: nbrs[u]) {
ll vd = ud + t;
if (ds[v] > vd) {
ds[v] = vd;
q.push({-vd, v});
}
}
}
}
/* main */
int main() {
int n, m, l, s, e;
scanf("%d%d%d%d%d", &n, &m, &l, &s, &e);
for (int i = 0; i < m; i++) {
int u, v, t;
scanf("%d%d%d", &u, &v, &t);
u--, v--;
nbrs[u].push_back({v, t});
nbrs[v].push_back({u, t});
}
for (int i = 0; i < l; i++) scanf("%d", ts + i), ts[i]--;
dijkstra(n, 0, ds0);
dijkstra(n, n - 1, ds1);
ll mind = LINF;
for (int i = 0; i < l; i++)
if (ds0[ts[i]] < s + e) {
ll d = max(ds0[ts[i]] , (ll)s) + 1 + ds1[ts[i]];
mind = min(mind, d);
}
printf("%lld\n", (mind < LINF) ? mind : -1LL);
return 0;
}
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