제출 #1245826

#제출 시각아이디문제언어결과실행 시간메모리
1245826vux2codeCities (BOI16_cities)C++20
100 / 100
1995 ms71652 KiB
#include <bits/stdc++.h> using namespace std; #define int long long typedef long long ll; typedef pair<ll,ll> pll; typedef pair<int, int> pii; typedef pair<ll,pll> lll; #define fi first #define se second void maxi (int &x, int y) {x = max (x, y);} void mini (int &x, int y) {x = min (x, y);} const ll maxN = 2e5 + 5, maxLog = 20, mod = 1e9 + 7, inf64 = 1e18, maxK = 5; class Compare { public: bool operator()(lll a, lll b) { if(a. se. se != b. se. se) return a. se. se > b. se. se; if(a. fi != b. fi) return a. fi > b. fi; return a. se. fi > b. se. fi; } }; ll n, k, m, a [maxK], dij [maxN] [1 << maxK]; vector <pii> adj [maxN]; priority_queue <lll, vector <lll>, greater <lll>> q; signed main () { ios::sync_with_stdio (0); cin. tie (0); cout. tie (0); #define task "untitled1" if (fopen (task".inp", "r")) { freopen (task".inp", "r", stdin); freopen (task".out", "w", stdout); } cin >> n >> k >> m; for (int i = 0; i < k; i ++) cin >> a [i]; for (int i = 1, u, v, w; i <= m; i ++) { cin >> u >> v >> w; adj [u]. push_back ({v, w}); adj [v]. push_back ({u, w}); } memset (dij, 0x3f, sizeof dij); for (int i = 0; i < k; i ++) { dij [a [i]] [1 << i] = 0; } for (int fk = 0; fk < (1 << k) - 1; fk ++) { for (int i = 1; i <= n; i ++) q. push ({dij [i][fk], {i, fk}}); while (!q. empty ()) { ll dis = q. top (). fi; pll pos = q. top (). se; q. pop (); if (dis != dij [pos. fi] [pos. se]) continue; for (pll i : adj [pos. fi]) { if (dij [i. fi] [pos. se] > dij [pos. fi] [pos. se] + i. se) { dij [i. fi] [pos. se] = dij [pos. fi] [pos. se] + i. se; q. push ({dij [i. fi] [pos. se], {i. fi, pos. se}}); } } } for (int i = 1; i <= n; i ++) { for (int msk = 0; msk < (1 << k); msk ++) { if (fk & msk) continue; mini (dij [i] [msk | fk], dij [i] [msk] + dij [i] [fk]); } } } ll ans = inf64; for (int i = 1; i <= n; i ++) mini (ans, dij [i] [(1 << k) - 1]); cout << ans; }

컴파일 시 표준 에러 (stderr) 메시지

cities.cpp: In function 'int main()':
cities.cpp:35:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
cities.cpp:36:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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