Submission #967496

#TimeUsernameProblemLanguageResultExecution timeMemory
967496Neco_arcCities (BOI16_cities)C++17
100 / 100
1721 ms82944 KiB
#include <bits/stdc++.h> #define ll long long #define all(x) x.begin(), x.end() #define Neco "Cities" #define resp(x) sort(all(x)), x.resize(unique(all(x)) - x.begin()) #define getbit(x,i) ((x >> i)&1) #define _left id * 2, l, mid #define _right id * 2 + 1, mid + 1, r #define cntbit(x) __builtin_popcountll(x) #define fi(i, a, b) for(int i = a; i <= b; i++) #define fid(i, a, b) for(int i = a; i >= b; i--) #define maxn (int) 2e5 + 7 using namespace std; const ll mod = 1e9 + 7; //972663749 const ll base = 911382323; mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()); ll GetRandom(ll l, ll r) { return uniform_int_distribution<ll> (l, r)(rng); } int n, k, m; int imp[maxn]; ll dp[35][maxn]; vector<pair<int, ll>> edges[maxn]; void DJK(ll dp[maxn]) { priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>> > q; fi(i, 1, n) q.push({dp[i], i}); while(!q.empty()) { ll u = q.top().second, g = q.top().first; q.pop(); if(g > dp[u]) continue; for(auto [v, w] : edges[u]) { if(dp[u] + w < dp[v]) { dp[v] = dp[u] + w, q.push({dp[v], v}); } } } } void solve() { cin >> n >> k >> m; fi(i, 1, k) cin >> imp[i]; fi(i, 1, m) { int x, y, w; cin >> x >> y >> w; edges[x].push_back({y, w}), edges[y].push_back({x, w}); } memset(dp, 60, sizeof dp); fi(i, 1, k) dp[(1 << (i - 1))][imp[i]] = 0; fi(x, 1, (1 << k) - 1) { fi(i, 1, n) for(int y = x; y > 0; y = (y - 1) & x) dp[x][i] = min(dp[x][i], dp[x ^ y][i] + dp[y][i]); DJK(dp[x]); } cout << *min_element(dp[(1 << k) - 1] + 1, dp[(1 << k) - 1] + 1 + n); } int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if(fopen(Neco".inp", "r")) { freopen(Neco".inp", "r", stdin); freopen(Neco".out", "w", stdout); } int nTest = 1; // cin >> nTest; while(nTest--) { solve(); } return 0; }

Compilation message (stderr)

cities.cpp: In function 'int main()':
cities.cpp:84:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |         freopen(Neco".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
cities.cpp:85:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |         freopen(Neco".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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