B. Search the Khoj_Solution

/*
Tanzila Islam
Southeast University
mail : tanzilamohita@gmail.com
Problem Link:
https://algo.codemarshal.org/contests/DRP2015/problems/B
*/

#include<iostream>
#include<cstdio>
using namespace std;

bool match (string a, string b) {
    int flag = 0;


    for (int i=0; i<a.length(); i++) {
        if (a[i] != b[i]) {
            flag++;
        if (flag >1) return false;
        }
    }
    return true;

}

int main (void) {
    int t;
    //scanf("%d", &t)
    cin >> t;
    for (int i=1; i<=t; i++) {
        int n;
        scanf("%d", &n);
        //cin >> n;
        string array[n];
        for (int j=0; j<n; j++) {
            cin>>array[j];
        }
        string key;
        cin >> key;

        printf("Case %d:\n", i);

        for (int j=0; j<n; j++) {
            //cout << array[j] << endl;
            bool result = match (key, array[j]);
            if (result) cout << array[j] <<endl;
        }

    }
}