zhen'dos - hui

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <cmath>
#include <iomanip>
#include <cstring>
#include <vector>
#include <fstream>
#include <stack>

using namespace std;

int main()
{
    fstream fin, fout;
    fout.open("output.txt", ios::out);
    int n, k;
    cin >> n >> k;
    for(int i = 0; i < n; ++i){
        fout << " ";
    }
    for(int i = 0; i < k; ++i){
        int r;
        cin >> r;
        char a[1000];
        cin >> a;
        fout.seekg(r, ios::beg);
        fout << a;
    }
    fout.close();
    return 0;
}