Va 558-Wormholes // Bellman-Ford

Source: Internet
Author: User

Analysis: Template question, but understanding the question. The Ring cannot be a strong connected branch. I wrote a code based on the strong connected branch, but WA is now ....

The following is the AC code:

#include<cstdio>#include<cstring>#include<queue>#include<vector>using namespace std;const int INF = 100000000;const int maxn = 1005;vector<int> G[maxn];int weight[maxn][maxn];queue<int> q;bool inq[maxn];int d[maxn];int count[maxn];int n,m;bool Bellman_Ford(){    for(int i = 0 ; i < n; i++) d[i] = INF,inq[i] = false,count[i] = 0;    d[0] = 0;    count[0] = 1;    q.push(0); inq[0] = true;    while(!q.empty())    {        int u = q.front(); q.pop();        inq[u] = false;        for(int i = 0; i < G[u].size(); i++)        {            int v = G[u][i];            if(d[v] > d[u] + weight[u][v])            {                d[v] = d[u] + weight[u][v];                if(!inq[v])                {                    inq[v] = true;                    count[v]++;                    if(count[u] >= n) return true;                    q.push(v);                }            }        }    }    return false;}int main(){    int t;    scanf("%d",&t);    while(t--)    {        scanf("%d%d",&n,&m);        for(int i = 0; i < n; i++) G[i].clear();        int u,v,w;        for(int i = 0 ; i < m; i++)        {            scanf("%d%d%d",&u,&v,&w);            G[u].push_back(v);            weight[u][v] = w;        }        if(Bellman_Ford()) printf("possible\n");        else printf("not possible\n");    }    return 0;}

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