Submission #756302

#TimeUsernameProblemLanguageResultExecution timeMemory
756302Shreyan_PaliwalToll (BOI17_toll)C++17
100 / 100
198 ms166756 KiB
#include <bits/stdc++.h> using namespace std; #define int long long const int maxn = 50000; const int maxo = 10000; const int maxk = 5; const int logn = 17; const int INF = 1e15; int k, n, m, o; int dp[maxn][logn][maxk][maxk]; int ans[maxk][maxk], ans2[maxk][maxk]; // inline void comb(int a2[maxk][maxk], int a[maxk][maxk], int m[maxk][maxk]) { // for (int i = 0; i < k; i++) // for (int j = 0; j < k; j++) // for (int l = 0; l < k; l++) // a2[i][l] = min(a2[i][l], a[i][j] + m[j][l]); // } // signed main() { // cin.tie(nullptr) -> ios::sync_with_stdio(false); // freopen("main.in", "r", stdin); // fill(dp[0][0][0], dp[0][0][0] + maxn*logn*maxk*maxk, INF); // cin >> k >> n >> m >> o; // for (int i = 0; i < m; i++) { // int a, b, t; cin >> a >> b >> t; // dp[a/k][0][a%k][b%k] = t; // } // // set up binary lifting // for (int i = 1; i < logn; i++) { // for each power of 2 jump // for (int j = 0; j + (1 << i) <= (n-k+1)/k; j++) { // do all j where j+(power of 2) is still an actual section // comb(dp[j][i], dp[j][i-1], dp[j+(1<<(i-1))][i-1]); // } // } // for (int i = 0; i < o; i++) { // int a, b; cin >> a >> b; // int A = a/k, B = b/k; // fill(ans[0], ans[0] + maxk*maxk, INF); // ans[a%k][a%k] = 0; // for (int j = logn-1; j >= 0; j--) // if (((B-A)>>j) & 1) { // fill(ans2[0], ans2[0] + maxk*maxk, INF); // comb(ans2, ans, dp[A][j]); // A += (1<<j); // for (int c = 0; c < k; c++) // for (int d = 0; d < k; d++) // ans[c][d] = ans2[c][d]; // } // cout << (ans[a%k][b%k] == INF ? -1 : ans[a%k][b%k]) << endl; // } // return 0; // } // int k, n, m, o; // int dp[50000][17][5][5], ans[5][5], ans2[5][5]; void combine(int target[5][5], int a[5][5], int b[5][5]) { for (int x = 0; x < k; x++) { for (int y = 0; y < k; y++) { for (int z = 0; z < k; z++) { target[x][y] = min(target[x][y], a[x][z] + b[z][y]); } } } } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); // freopen("main.in", "r", stdin); cin >> k >> n >> m >> o; memset(dp, 0x3f, sizeof dp); while (m--) { int a, b, t; cin >> a >> b >> t; dp[a / k][0][a % k][b % k] = t; } for (int j = 1; j < 17; j++) { for (int i = 0; i + (1 << j) < (n + k - 1) / k; i++) { combine(dp[i][j], dp[i][j - 1], dp[i + (1 << (j - 1))][j - 1]); } } while (o--) { int a, b; cin >> a >> b; memset(ans, 0x3f, sizeof ans); for (int i = 0; i < 5; i++) ans[i][i] = 0; for (int curr = a / k, dest = b / k, i = 16; ~i; i--) { if (curr + (1 << i) <= dest) { memset(ans2, 0x3f, sizeof ans2); combine(ans2, ans, dp[curr][i]); memcpy(ans, ans2, sizeof ans); curr += (1 << i); } } cout << (ans[a % k][b % k] == 0x3f3f3f3f3f3f3f3f ? -1 : ans[a % k][b % k]) << '\n'; } return 0; }
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