只有70分，WA和RE都有，求大佬求解

#include<iostream>
#include<string>
#include<cstring>
using namespace std;
struct student{
	int direct;//0朝向圈内 1朝向圈外
	string name;
}a[10001];
int main() {
	int n, m;
	cin >> n >> m;
	for (int i = 1; i <= n; i++) {
		cin >> a[i].direct >> a[i].name;
	}
	int lr, s;//0为左 1为右
	int pos = 1;
	for (int i = 1; i <= m; i++) {
		cin >> lr >> s;
		if (a[pos].direct == 0 && lr == 0)pos = (pos - s + n) % n;
		else if (a[pos].direct == 0 && lr == 1)pos = (pos + s) % n;
		else if(a[pos].direct == 1 && lr == 0)pos = (pos + s) % n;
		else if(a[pos].direct == 1 && lr == 1)pos = (pos - s + n) % n;
	}
	cout << a[pos].name;
}