son_of_bithch @ 2023-08-04 09:22:54
#include<iostream>
#include<queue>
#include<string.h>
using namespace std;
const int maxn=1e5+5,maxm=2e5+5,Inf=0x3f3f3f3f;
int n,m,s,head[maxm<<1],len;
bool vis[maxn];
long long int dis[maxn];
struct Edge{
int u,v,w,next;
}e[maxm<<1];
struct Node{
int num,dis;
Node(int x,int y){
num=x;dis=y;
}
};
bool operator<(const Node &a,const Node &b){
return a.dis>b.dis;
}
void Dij(int s){
priority_queue<Node> q;
memset(dis,Inf,sizeof(dis));
dis[s]=0;
q.push(Node(s,0));
while(!q.empty()){
int u=q.top().num;q.pop();
for(int i=head[u];i;i=e[i].next){
int v=e[i].v;
if(dis[v]>dis[u]+e[i].w){
dis[v]=dis[u]+e[i].w;
q.push(Node(v,dis[v]));
}
}
}
}
void Insert(int u,int v,int w){
e[++len].u=u;
e[len].v=v;
e[len].w=w;
e[len].next=head[u];
head[u]=len;
}
void Read(){
scanf("%d%d%d",&n,&m,&s);
for(int i=1;i<=m;++i){
int u,v,w;
scanf("%d%d%d",&u,&v,&w);
Insert(u,v,w);
}
}
int main(){
Read();
Dij(s);
for(int i=1;i<=n;++i){
printf("%lld ",dis[i]);
}
return 0;
}
by Michaellg @ 2023-08-04 09:42:29
@son_of_bithch 要使用 vis
数组
我的代码:
while (!q.empty()) {
int u = q.top().u; q.pop();
if (vis[u])
continue;
vis[u] = true;
for (int i = h[u]; i; i = r[i].nxt)
if (dis[u] + r[i].dis < dis[r[i].v]) {
dis[r[i].v] = dis[u] + r[i].dis;
q.push(node{r[i].v, dis[r[i].v]});
}
}
by son_of_bithch @ 2023-08-04 10:04:40
@Michaellg 蟹蟹大佬