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

int main(){
    int N;
    cin>>N;
    bool frien[N+1]={true};
    int count=3;
    int alive=N;
    int corrent=0;
    
    while(alive!=1){
        //每次传3个
        for(int i=0;i<count;i++){
            if(frien[corrent]){
                corrent++;
                if(corrent>N)
                    corrent=1;
            }
       ...