View Code of Problem 4062

# include<iostream>
# include<vector>
# include<math.h>
# include<algorithm>
# include<string>
using namespace std;
int main()
{
	int n;
	cin>>n;
	while(n--){
		string str1, str2;
		cin>>str1;
		cin>>str2;
		int k;
		cin>>k;
		int ret = 0, len = str1.size();
		for(int i = 0; i < len; i++){
			if(str1[i] != str2[i])	ret++;
		}
		if(ret%2==1)	cout<<"NO"<<endl;
		else if(ret/2 > k) cout<<"NO"<<endl;
		else cout<<"YES"<<endl; 
	} 
	return 0;
}