Submission #1264939

#TimeUsernameProblemLanguageResultExecution timeMemory
1264939icebearToll (BOI17_toll)C++20
7 / 100
63 ms9100 KiB
// ~~ icebear ~~ #include <bits/stdc++.h> using namespace std; #define int ll typedef long long ll; typedef pair<int, int> ii; typedef pair<int, ii> iii; template<class T> bool minimize(T &a, const T &b) { if (a > b) return a = b, true; return false; } template<class T> bool maximize(T &a, const T &b) { if (a < b) return a = b, true; return false; } #define FOR(i,a,b) for(int i=(a); i<=(b); ++i) #define FORR(i,a,b) for(int i=(a); i>=(b); --i) #define REP(i, n) for(int i=0; i<(n); ++i) #define RED(i, n) for(int i=(n)-1; i>=0; --i) #define MASK(i) (1LL << (i)) #define BIT(S, i) (((S) >> (i)) & 1) #define mp make_pair #define pb push_back #define fi first #define se second #define all(x) x.begin(), x.end() #define task "icebear" const int MOD = 1e9 + 7; const int inf = 1e9 + 27092008; const ll INF = 1e18 + 27092008; const int N = 50000 + 5; int n, k, m, q; vector<ii> G[2][N]; ll dist[2][N], ans[N]; vector<array<int, 3>> queries; void dijkstra(int T, int layer, int L, int R) { priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>>> Q; FOR(i, L * k, (R + 1) * k - 1) dist[T][i] = INF; FOR(i, layer * k, (layer + 1) * k - 1) { dist[T][i] = 0; Q.push(mp(0, i)); } while(!Q.empty()) { ll du; int u; tie(du, u) = Q.top(); Q.pop(); if (du != dist[T][u]) continue; for(ii v : G[T][u]) if (L * k <= v.fi && v.fi < (R + 1) * k) { if (minimize(dist[T][v.fi], du + v.se)) Q.push(mp(dist[T][v.fi], v.fi)); } } } void DnC(int L, int R, vector<array<int, 3>> &queries) { if (L + 1 >= R) { for(auto &x : queries) { for(ii v : G[0][x[0]]) if (v.fi == x[1]) ans[x[2]] = v.se; } return; } int mid = (L + R) >> 1; vector<array<int, 3>> left, right; dijkstra(0, mid, L, R); dijkstra(1, mid, L, R); for(auto &x : queries) { if (x[1] / k <= mid) left.pb(x); else if (x[0] / k >= mid) right.pb(x); else { minimize(ans[x[2]], dist[1][x[0]] + dist[0][x[1]]); } } DnC(L, mid, left); DnC(mid, R, right); } void init(void) { cin >> k >> n >> m >> q; FOR(i, 1, m) { int a, b, t; cin >> a >> b >> t; G[0][a].pb(mp(b, t)); G[1][b].pb(mp(a, t)); } FOR(i, 1, q) { int a, b; cin >> a >> b; queries.pb({a, b, i}); } } void process(void) { FOR(i, 1, q) ans[i] = INF; DnC(0, n / k, queries); FOR(i, 1, q) cout << (ans[i] == INF ? -1 : ans[i]) << '\n'; } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if (fopen(task".inp", "r")) { freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); } int tc = 1; // cin >> tc; while(tc--) { init(); process(); } return 0; }

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:110:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  110 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:111:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  111 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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