请dalao教学__gnu_pbds ，为什么Dijkstra的堆优化编译报错

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <ext/pb_ds/priority_queue.hpp>
#define pa pair<int,int>
#define mp make_pair
using namespace std;
using namespace __gnu_pbds;
typedef __gnu_pbds::priority_queue<pa,greater<pa>,thin > heap;
const int N=1e4+5,M=5e5+5,INF=2147483647;
inline int read(){
    char c=getchar();int x=0,f=1;
    while(c<'0'||c>'9'){if(c=='-')f=-1;c=getchar();}
    while(c>='0'&&c<='9'){x=x*10+c-'0';c=getchar();}
    return x*f;
}
int n,m,s,u,v,w;
struct edge{
    int v,ne,w;
}e[M];
int h[N],cnt=0;
inline void ins(int u,int v,int w){
    cnt++;
    e[cnt].v=v;e[cnt].w=w;e[cnt].ne=h[u];h[u]=cnt;
}

heap q;
heap::point_iterator it[N];
int d[N];
void dij(int s){
    for(int i=1;i<=n;i++) d[i]=INF;
    d[s]=0;
    it[s]=q.push(mp(0,s));
    while(!q.empty()){
        int u=q.top().second;q.pop();
        for(int i=h[u];i;i=e[i].ne){
            int v=e[i].v,w=e[i].w;
            if(d[v]>d[u]+w){
                d[v]=d[u]+w;
                if(it[v]!=0) q.modify(it[v],mp(d[v],v));
                else it[v]=q.push(mp(d[v],v));
            }
        }
    }
}
int main(){
    n=read();m=read();s=read();
    for(int i=1;i<=m;i++){u=read();v=read();w=read();ins(u,v,w);}
    dij(s);
    for(int i=1;i<=n;i++) printf("%d ",d[i]);
}