明明没有用cin啊 代码：

#include<cstdio>
#include<iostream>
#include<string>
#define MAXN 1000000
char a1[MAXN],b1[MAXN];
int main()
{
	int t,n,p,x,y;
	char s;
	bool ju;
	scanf("%d",&t);
	for(int tim=1;tim<=t;++tim)
	{
		scanf("%d %d",&n,&p);
		scanf("%s",a1);
		scanf("%s",b1);
		ju=true;
		for(int i=0;i<=n;++i)
		{
			if(a1[i]!=b1[i]) {ju=false; break;}
		}
		if(ju==true) printf("Yes\n");
		else printf("No\n");
		for(int i=1;i<=p;++i)
		{
			ju=true;
			scanf("%d %d %c",&x,&y,&s);
			if(x==1) b1[y-1]=s;
			else if(x==0) a1[y-1]=s;
			for(int i=0;i<n;++i)
			{
				if(a1[i]!=b1[i]) {ju=false; break;}
			}
			if(ju==true) printf("Yes\n");
			else printf("No\n");
		}
	}
    return 0;
}

疑惑*10086