这题为什么一直不对啊？求dalao帮忙。

代码:

#include <iostream>
#include<string>
using namespace std;
int n, m, t1, t2, num = 1;
struct per
{
    int f;
    string s;
}a[100001];
int main()
{
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
        cin >> a[i].f >> a[i].s;
    for (int i = 1; i <= m; i++)
    {
        cin >> t1 >> t2;
        if ((t1 == 0 && a[num].f == 0) || (t1 == 1 && a[num].f == 1))
            num = (num + m - t2) % m;
        else
            num = (num + t2) % m;
    }
    cout << a[num].s;
    return 0;
}