Submission #976520

#TimeUsernameProblemLanguageResultExecution timeMemory
976520phcbakaRelay Marathon (NOI20_relaymarathon)C++17
0 / 100
3 ms6488 KiB
#include <bits/stdc++.h> using namespace std; #define int long long using ii = pair <int, int>; int n, m, k; void read() { cin >> n >> m >> k; } struct vet { int spec[510]={},a[510][510]; ii dp[510][510]; void calc() { memset(a, 0x3f3f, sizeof(a)); for (int i = 1; i <= n; ++i) a[i][i] = 0; for (int i = 1; i <= m; ++i) { int u, v, L; cin >> u >> v >> L; a[u][v] = min(a[u][v], L); a[v][u] = min(a[v][u], L); } for (int i = 1; i <= k; ++i) { int u; cin >> u; spec[u] = 1; } for (int k = 1; k <= n; ++k) for (int i = 1; i <= n; ++i) for (int j = 1; j <= n; ++j) a[i][j] = min(a[i][j], a[i][k]+a[k][j]); for (int i = 1; i <= n; ++i) { for (int j = 1; j <= n; ++j) if (spec[i] == 0 or spec[j] == 0 or i == j) { dp[i][j]={1e9,j}; } else dp[i][j]={a[i][j],j}; sort (dp[i]+1, dp[i]+n+1); } int ans = LLONG_MAX; for (int i = 1; i <= n; ++i) for (int j = 1; j <= n; ++j) for (int t = 1; t <= min(5ll, n); ++t) for (int c = 1; c <= min(5ll, n); ++c) if (i != j and i != dp[i][t].second and i != dp[j][c].second and j != dp[i][t].second and j != dp[j][c].second and dp[i][t].second != dp[j][c].second) { ans = min(ans, dp[i][t].first + dp[j][c].first); } cout << ans; exit(0); } }Vetcan; signed main() { cin.tie(0)->sync_with_stdio(0); #define task "cities" if (fopen(task ".inp", "r")) { freopen(task ".inp", "r", stdin); freopen(task ".out", "w", stdout); } read (); if (n <= 500 and m <= 500) { Vetcan.calc(); } return 0; }

Compilation message (stderr)

RelayMarathon.cpp: In function 'int main()':
RelayMarathon.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
RelayMarathon.cpp:83:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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