Submission #130424

#	Time	Username	Problem	Language	Result	Execution time	Memory
130424		win11905	Toll (BOI17_toll)	C++11	100 / 100	426 ms	49952 KiB

toll

#include <bits/stdc++.h>
using namespace std;

const int INF = 1e9;

int k, n, m, o;

int main() {
    scanf("%d %d %d %d", &k, &n, &m, &o);
    int h = n/k+1;
    vector<vector<vector<vector<int>>>> d(h, vector<vector<vector<int>>>(k, vector<vector<int>>(16, vector<int>(k, INF))));
    for(int i = 0, a, b, c; i < m; ++i) {
        scanf("%d %d %d", &a, &b, &c);
        d[a/k][a%k][0][b%k] = c; 
    }
    for(int z = 1; z < 16; ++z) for(int i = 0; i < h; ++i) for(int j = 0; j < k; ++j) for(int x = 0; x < k; ++x) for(int y = 0; y < k; ++y) 
       if(i + (1<<(z-1)) < h) d[i][j][z][x] = min(d[i][j][z][x], d[i][j][z-1][y] + d[i+(1<<(z-1))][y][z-1][x]);
    for(int i = 0, a, b; i < o; ++i) {
        scanf("%d %d", &a, &b);
        if(a/k >= b/k) {
            puts("-1");
            continue;
        }
        vector<int> ret = d[a/k][a%k][0];
        int p = b % k; 
        a = (a / k) + 1, b = b / k;
        for(int j = 15; ~j; --j) if(a + (1 << j) <= b) {
            vector<int> nret(k, INF);
            for(int x = 0; x < k; ++x) for(int y = 0; y < k; ++y) 
                nret[y] = min(nret[y], ret[x] + d[a][x][j][y]);
            a += (1 << j);
            ret = nret;
        }
        printf("%d\n", ret[p] == INF ? -1 : ret[p]);
    } 
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d %d", &k, &n, &m, &o);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:13:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d", &a, &b, &c);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:19:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~

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