记录R194641745

#include <bits/stdc++.h>
using namespace std;
int main(){
    string s,t;
    int T,n,q,o,p;
    char c;

    scanf("%d",&T);
    for(int i=1;i<=T;i++)
    {
        scanf("%d %d",&n,&q);
        cin>>s>>t;
        if(s.compare(t)==0)
            cout<<"Yes\n";
        else
            cout<<"No\n";
        if(q!=0)
        {
        	for(int i=1;i<=q;i++)
			{
        		scanf("%d %d %c",&o,&p,&c);
            	if(o==0)
            	    s[p-1]=c;
            	else
            	    t[p-1]=c;
            	if(s.compare(t)==0)
            	    cout<<"Yes\n";
            	else
            	    cout<<"No\n";
			}
        }
    }
    return 0;
}

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