Submission #388251

#TimeUsernameProblemLanguageResultExecution timeMemory
388251soroushToll (BOI17_toll)C++17
0 / 100
75 ms29240 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair < int , int > pii; const int maxn = 5e4 + 10; const ll inf = 1e10; #define pb push_back #define endl '\n' #define dokme(x) cout << x , exit(0) #define migmig ios::sync_with_stdio(false),cin.tie(0),cout.tie(0) #define ms(x , y) memset(x , y , sizeof x) #define fuck(x) for(int i = 0 ; i < 5 ; i ++)for(int j = 0 ; j < 5 ; j ++)x[i][j] = inf; int k , n , m , q; struct node{ ll dist[5][5]; friend node operator +(node l , node r){ node v; fuck(v.dist); for(int i = 0 ; i < 5 ; i ++)for(int k = 0 ; k < 5 ; k ++)for(int j = 0 ; j < 5 ; j ++) v.dist[i][k] = min(v.dist[i][k] , l.dist[i][j] + r.dist[j][k]); return v; } }seg[maxn<<2]; vector < pii > adj[maxn]; #define lc (v << 1) #define rc (lc | 1) #define mid ((l + r) >> 1) void build(int v = 1 , int l = 0 , int r = (n + k - 1)/k){ if(r - l == 1){ fuck(seg[v].dist); for(int s = l ; s < k ; s ++) for(auto u : adj[l * k + s]) seg[v].dist[s][u.first%k] = u.second; return; } build(lc , l , mid); build(rc , mid , r); seg[v] = seg[lc] + seg[rc]; } node get(int L , int R , int v = 1 , int l = 0 , int r = (n + k - 1)/k){ if(L <= l and r <= R) return seg[v]; if(L < mid and R <= mid) return get(L , R , lc , l , mid); if(L >= mid) return get(L , R , rc , mid , r); return get(L , R , lc , l , mid) + get(L , R , rc , mid , r); } int32_t main(){ migmig; cin >> k >> n >> m >> q; for(int i = 1 ; i <= m ; i ++){ int u , v , w; cin >> u >> v >> w; adj[u].pb({v , w}); } build(); while(q --){ int u , v; cin >> u >> v; if(u > v or u/k == v/k){ cout << -1 << endl; continue; } if(u == v){ cout << 0 << endl; continue; } auto res = get(u/k , v/k); cout << ((res.dist[u%k][v%k] == inf) ? -1 : res.dist[u%k][v%k]) << endl; } return(0); }
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