Submission #495518

#	Time	Username	Problem	Language	Result	Execution time	Memory
495518		hoanghq2004	Toll (BOI17_toll)	C++14	100 / 100	219 ms	199344 KiB

toll

#include <bits/stdc++.h>

using namespace std;

const int Nmax = 1e5 + 10;

int len, n, m, q;
int f[Nmax][5][5][20];

int main() {
    ios :: sync_with_stdio(0); cin.tie(0);
    cin >> len >> n >> m >> q;
    memset(f, 60, sizeof(f));
    while (m--) {
        int u, v, w;
        cin >> u >> v >> w;
        f[u / len][u % len][v % len][0] = min(f[u / len][u % len][v % len][0], w);
    }
    for (int lg = 1; (1 << lg) <= n / len + 1; ++lg) {
        for (int i = 0; i + (1 << lg) - 1 <= n / len + 1; ++i) {
            for (int x = 0; x < len; ++x)
                for (int y = 0; y < len; ++y) {
                    for (int z = 0; z < len; ++z) {
                        f[i][x][y][lg] = min(f[i][x][y][lg], f[i][x][z][lg - 1] + f[i + (1 << lg - 1)][z][y][lg - 1]);
                    }
                }
        }
    }
    while (q--) {
        int a, b;
        cin >> a >> b;
        int x = a % len, y = b % len;
        a /= len, b /= len;
        int g[2][5][5];
        memset(g, 60, sizeof(g));
        for (int i = 0; i < 5; ++i) g[0][i][i] = 0;
        int now = 0;
        for (int i = 19; i >= 0; --i) {
            if (a + (1 << i) <= b) {
                for (int x = 0; x < 5; ++x)
                    for (int y = 0; y < 5; ++y)
                        for (int z = 0; z < 5; ++z)
                            g[now ^ 1][x][y] = min(g[now ^ 1][x][y], g[now][x][z] + f[a][z][y][i]);
                memset(g[now], 60, sizeof(g[now]));
                a += (1 << i);
                now ^= 1;
            }
        }
        if (g[now][x][y] > 1e9) cout << -1 << '\n';
        else cout << g[now][x][y] << '\n';
    }
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:24:98: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   24 |                         f[i][x][y][lg] = min(f[i][x][y][lg], f[i][x][z][lg - 1] + f[i + (1 << lg - 1)][z][y][lg - 1]);
      |                                                                                               ~~~^~~

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 8 / 8
• Subtask 4: 31 / 31
• Subtask 5: 44 / 44