链与指针地图

#include <bits/stdc++.h>
using namespace std;

int main() {
vector<int> next{1,2,-1};
next.push_back(next[0]); next[0]=3;
int p=0,count=0;while(p!=-1){++count;p=next[p];}
cout<<next[0]<<" "<<count;
}

#include <bits/stdc++.h>
using namespace std;

int main() {
vector<int> next{1,2,-1};
next.push_back(next[0]); next[0]=3;
int p=0,count=0;while(p!=-1){++count;p=next[p];}
cout<<next[0]<<" "<<count;
}