标签:top std pop pre ios scanf namespace head continue
#include<iostream> #include<cstdio> #include<queue> using namespace std; int n,m,S,tot,Next[500010],head[20000],tree[500010],val[500010]; bool visit[20000]; long long dis[20000]; struct cmp { bool operator()(int a,int b) { return dis[a]>dis[b]; } }; priority_queue<int,vector<int>,cmp> Q; void add(int x,int y,int z) { tot++; Next[tot]=head[x]; head[x]=tot; tree[tot]=y; val[tot]=z; } int main() { scanf("%d%d%d",&n,&m,&S); tot=0; for (int i=1;i<=m;i++) { int x,y,z; scanf("%d%d%d",&x,&y,&z); if (x==y) continue; add(x,y,z); } for (int i=1;i<=n;i++) { visit[i]=false; dis[i]=2147483647; } Q.push(S); dis[S]=0; while (!Q.empty()) { int u=Q.top(); Q.pop(); if (visit[u]) continue; visit[u]=true; for (int i=head[u];i;i=Next[i]) { int v=tree[i]; if (!visit[v]&&dis[v]>dis[u]+(long long)val[i]) { dis[v]=dis[u]+val[i]; Q.push(v); } } } for (int i=1;i<=n-1;i++) printf("%lld ",dis[i]); printf("%lld\n",dis[n]); return 0; }
标签:top std pop pre ios scanf namespace head continue
原文地址:https://www.cnblogs.com/Esquecer/p/10428454.html