Submission #1264432

#TimeUsernameProblemLanguageResultExecution timeMemory
1264432minggaToll (BOI17_toll)C++20
0 / 100
44 ms42312 KiB
// Author: caption_mingle #include "bits/stdc++.h" using namespace std; #define ln "\n" #define pb push_back #define fi first #define se second #define all(x) (x).begin(), (x).end() #define sz(x) ((int)(x).size()) #define ll long long const int mod = 1e9 + 7; const int inf = 2e9; const int N = 50005; int k, n, m, q; ll f[N][20][5]; vector<pair<int, int>> g[N]; signed main() { cin.tie(0) -> sync_with_stdio(0); #define task "" if(fopen(task ".INP", "r")) { freopen(task ".INP", "r", stdin); freopen(task ".OUT", "w", stdout); } cin >> k >> n >> m >> q; for(int i = 1; i <= m; i++) { int a, b, t; cin >> a >> b >> t; g[a].pb({b, t}); } for(int i = 0; i < n; i++) { for(int j = 0; j < 20; j++) { for(int t = 0; t < k; t++) { f[i][j][t] = inf; } } } for(int i = 0; i < n; i++) { for(auto [v, w] : g[i]) { f[i][0][v % k] = w; } } for(int j = 1; (1 << j) <= n / k; j++) { for(int i = 0; i < n; i++) { for(int x1 = 0; x1 < k; x1++) { int bl = (i / k) + (1 << (j - 1)); for(int x2 = 0; x2 < k; x2++) { f[i][j][x1] = min(f[i][j][x1], f[i][j - 1][x2] + f[bl * k + x2][j - 1][x1]); } } } } for(int i = 1; i <= q; i++) { int a, b; cin >> a >> b; int range = (b / k) - (a / k); vector<vector<ll>> mn(2, vector<ll>(k, inf)); mn[0][a % k] = 0; int bl = a / k; for(int j = 0; (1 << j) <= range; j++) { if(range >> j & 1) { for(int x2 = 0; x2 < k; x2++) { for(int x1 = 0; x1 < k; x1++) { mn[1][x1] = min(mn[1][x1], mn[0][x2] + f[bl * k + x2][j][x1]); } } bl += (1 << j); mn[0] = mn[1]; mn[1] = vector<ll>(k, inf); } } if(mn[0][b % k] >= (int)inf) cout << -1; else cout << mn[0][b % k]; cout << ln; } cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC; }

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:27:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |                 freopen(task ".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:28:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |                 freopen(task ".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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