求助64pts（单纯探讨一下，玄关）

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn=1e6+10;
int tack[maxn];/*
int o=7;
void check(){
	for(int i=1;i<=o;i++){
		cout<<"tack["<<i<<"]="<<tack[i]<<endl;
	}
}*/
signed main(){
    int n;
    scanf("%lld",&n);
    for(int i=1;i<=n;i++){
        int op;
    	scanf("%lld",&op);
        //cout<<endl<<op<<endl;
        if(op==1) {
        	int x;
        	scanf("%lld",&x);
        	//cout<<endl<<x<<endl;
			tack[x]++; 
			//cout<<tack[x]<<endl;
			//check();
        }
        else if (op == 2){
        	//check();
            int i=1;
            while(tack[i]==0) i++;
            cout<<i<<endl;
            //check();
        }
        else if(op == 3) {
        	//check();
            int i=1;
            while(tack[i]==0) i++;
            tack[i]--;
            //check();
        }
    }
    return 0;
}