[USACO07NOV]牛栏Cow Hurdles
OJ题号:洛谷2888
思路:修改Floyd,把边权和改为边权最大值。另外注意是有向图。
#include<cstdio>
#include<algorithm>
using namespace std;
#define inf 0x7fffffff
int main() {
int n,m,t;
scanf("%d%d%d",&n,&m,&t);
int d[n+][n+];
for(int i=;i<=n;i++) {
for(int j=;j<=n;j++) {
d[i][j]=(i==j)?:inf;
}
}
while(m--) {
int s,e,h;
scanf("%d%d%d",&s,&e,&h);
d[s][e]=h;
}
for(int k=;k<=n;k++) {
for(int i=;i<=n;i++) {
for(int j=;j<=n;j++) {
d[i][j]=min(d[i][j],max(d[i][k],d[k][j]));
}
}
}
while(t--) {
int a,b;
scanf("%d%d",&a,&b);
printf("%d\n",(d[a][b]!=inf)?d[a][b]:-);
}
return ;
}
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