Submission #59132

#	Time	Username	Problem	Language	Result	Execution time	Memory
59132		wilwxk	Travelling Merchant (APIO17_merchant)	C++11	100 / 100	188 ms	13148 KiB

merchant

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

const int MAXN=105;
const int MAXK=1005;
const long long INF=1e15+9;
long long v[MAXN][MAXK][2];
long long dist[MAXN][MAXN], prof[MAXN][MAXN];
long long g[MAXN][MAXN];
bool chega[MAXN][MAXN];
int n, m, k;

void floyd() {
    for(int kk=1; kk<=n; kk++) {
        for(int i=1; i<=n; i++) {
            for(int j=1; j<=n; j++) {
                if(chega[i][kk]==0||chega[kk][j]==0) continue;
                dist[i][j]=min(dist[i][j], dist[i][kk]+dist[kk][j]);
                chega[i][j]=1;
            }
        }
    }
}

bool testa(long long x) {
    for(int i=1; i<=n; i++) {
        for(int j=1; j<=n; j++) {
            if(chega[i][j]==0) continue;
            g[i][j]=(x*dist[i][j])-prof[i][j];
        }
    }

    for(int kk=1; kk<=n; kk++) {
        for(int i=1; i<=n; i++) {
            for(int j=1; j<=n; j++) {
                if(chega[i][kk]==0||chega[kk][j]==0) continue;
                g[i][j]=min(g[i][j], g[i][kk]+g[kk][j]);
            }
        }
    }

    //printf("%lld::: ", x); for(int i=1; i<=n; i++) printf("%lld ", g[i][i]); printf("\n");
    for(int i=1; i<=n; i++) if(chega[i][i]&&g[i][i]<=0) return 1;
    return 0;
}

int main() {
    scanf("%d %d %d", &n, &m, &k);
    for(int i=1; i<=n; i++) for(int j=1; j<=k; j++) scanf("%lld %lld", &v[i][j][0], &v[i][j][1]);
    for(int i=1; i<=n; i++) for(int j=1; j<=n; j++) dist[i][j]=INF;
    while(m--) { int a, b, c; scanf("%d %d %d", &a, &b, &c); dist[a][b]=c; chega[a][b]=1; }

    floyd();

    for(int i=1; i<=n; i++) {
        for(int j=1; j<=n; j++) {
            for(int kk=1; kk<=k; kk++) {
                if(!chega[i][j]) continue;
                if(v[i][kk][0]==-1||v[j][kk][1]==-1) continue;
                prof[i][j]=max(prof[i][j], v[j][kk][1]-v[i][kk][0]);
            }
        }
    }

    long long resp=0;
    for(long long i=1e9+1; i>0; i/=2) while(testa(resp+i)) resp+=i;

    printf("%lld\n", resp);

}

Compilation message (stderr)

merchant.cpp: In function 'int main()':
merchant.cpp:48:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d", &n, &m, &k);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:49:58: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1; i<=n; i++) for(int j=1; j<=k; j++) scanf("%lld %lld", &v[i][j][0], &v[i][j][1]);
                                                     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:51:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     while(m--) { int a, b, c; scanf("%d %d %d", &a, &b, &c); dist[a][b]=c; chega[a][b]=1; }
                               ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 21 / 21
• Subtask 3: 33 / 33
• Subtask 4: 34 / 34