Submission #550142

#TimeUsernameProblemLanguageResultExecution timeMemory
550142cig32Toll (BOI17_toll)C++17
100 / 100
103 ms30228 KiB
#include "bits/stdc++.h" using namespace std; #define int long long const int MAXN = 2e5 + 10; const int MOD = 998244353; #define ll __int128 mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count()); int rnd(int x, int y) { int u = uniform_int_distribution<int>(x, y)(rng); return u; } ll read() { int x; cin >> x; return (ll)x; } long long bm(long long b, long long p) { if(p==0) return 1 % MOD; long long r = bm(b, p >> 1); if(p&1) return (((r*r) % MOD) * b) % MOD; return (r*r) % MOD; } long long inv(long long b) { return bm(b, MOD-2); } long long f[MAXN]; long long nCr(int n, int r) { long long ans = f[n]; ans *= inv(f[r]); ans %= MOD; ans *= inv(f[n-r]); ans %= MOD; return ans; } void precomp() { for(int i=0; i<MAXN; i++) f[i] = (i == 0 ? 1 % MOD : (f[i-1] * i) % MOD); } int fastlog(int x) { return (x == 0 ? -1 : 32 - __builtin_clz(x) - 1); } void gay(int i) { cout << "Case #" << i << ": "; } void solve(int tc) { int k, n, m, q; cin >> k >> n >> m >> q; int st[16][k][n]; for(int i=0; i<16; i++) { for(int j=0; j<k; j++) { for(int l=0; l<n; l++) { st[i][j][l] = 1e16; } } } for(int i=0; i<m; i++) { int a, b, t; cin >> a >> b >> t; st[0][a % k][b] = min(st[0][a % k][b], t); } for(int i=1; i<16; i++) { for(int j=0; j<k; j++) { for(int l=0; l<n; l++) { if(l / k >= (1 << i)) { for(int g=0; g<k; g++) { int block = l / k - (1 << (i-1)); st[i][j][l] = min(st[i][j][l], st[i-1][g][l] + st[i-1][j][block * k + g]); } } } } } for(int i=0; i<q; i++) { int a, b; cin >> a >> b; int A = a / k, B = b / k; int d = B - A; int dp[k]; for(int j=0; j<k; j++) dp[j] = 1e16; dp[b % k] = 0; for(int j=15; j>=0; j--) { if(d >= (1 << j)) { int newdp[k]; for(int l=0; l<k; l++) newdp[l] = 1e16; for(int l=0; l<k; l++) { int rel = B * k + l; for(int c=0; c<k; c++) { newdp[c] = min(newdp[c], dp[l] + st[j][c][rel]); } } d -= (1 << j); B -= (1 << j); for(int l=0; l<k; l++) dp[l] = newdp[l]; } } cout << (dp[a % k] == 1e16 ? -1 : dp[a % k]) << '\n'; } } int32_t main() { precomp(); ios::sync_with_stdio(0); cin.tie(0); int t = 1; //cin >> t; for(int i=1; i<=t; i++) solve(i); } // I don't know geometry.
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