Heavy Transportation
题目大意:
#include<algorithm>
#include<queue>
#include<stdio.h>
#include<string.h>
#include<vector>
#include<math.h>
using namespace std; const int maxn = ;
const int oo = 0xfffffff; struct node
{
int y, weight;
node(int y, int weight):y(y), weight(weight){}
}; vector<node>G[maxn];
int v[maxn]; void spfa(int s)
{
queue<int> Q;
Q.push(s); while(Q.size())
{
s = Q.front(), Q.pop();
int len = G[s].size(); for(int i=; i<len; i++)
{
node q = G[s][i]; if(v[s] > v[q.y] && q.weight > v[q.y])
{
v[q.y] = min(v[s], q.weight);
Q.push(q.y);
}
}
}
} int main()
{
int T, t=; scanf("%d", &T); while(T--)
{
int N, M, a, b, w, i; scanf("%d%d", &N, &M); for(i=; i<=N; i++)
{
G[i].clear();
v[i] = -oo;
}
v[] = oo; for(i=; i<M; i++)
{
scanf("%d%d%d", &a, &b, &w);
G[a].push_back(node(b, w));
G[b].push_back(node(a, w));
} spfa(); printf("Scenario #%d:\n", t++);
printf("%d\n\n", v[N]);
} return ;
}
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