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- #include <bits/stdc++.h>
- using namespace std;
- const int L = 1000;
- char prv[L + 2], cur[L + 2];
- int main(){
- int len, n;
- scanf("%d%d", &len, &n);
- for(int i = 1; i <= n; ++i){
- scanf(" %s", cur);
- if(i == 1){
- int cnt = 0;
- for(int j = 0; j < len; ++j){
- if(prv[j] != cur[j]){
- ++cnt;
- if(cnt > 2){
- printf("%s", prv);
- return 0;
- }
- }
- }
- }
- strcpy(prv, cur);
- }
- printf("%s", prv);
- return 0;
- }
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