样例和自己测试数据都对的不知道为啥WA 上代码

#include<iostream>
#include<algorithm>
#pragma warning(disable:4996)
using namespace std;
int main(void)
{
	int n, m, k, a[100005], b[100005];
	scanf("%d %d", &n, &m);
	for (int i = 0; i < n; i++)
	{
		scanf("%d",&a[i]);
	}
	for (int i = 0; i < m; i++)
	{
		int r = n - 1, l = 0, x;
		scanf("%d", &x);
		while (r > l)
		{
			int mid = (l + r) / 2;
			if (a[mid] >= x)r = mid;
			else l = mid + 1;
		}
		if (i != m - 1)
		{
			if (a[l] != x)printf("-1 ");
			else printf("%d ", l + 1);
		}
		else
		{
			if (a[l] != x)printf("-1");
			else printf("%d", l + 1);
		}
	}
	return 0;
}