Submission #372751

#	Time	Username	Problem	Language	Result	Execution time	Memory
372751		FatihSolak	Three Friends (BOI14_friends)	C++17	0 / 100	2 ms	364 KiB

friends

#include <bits/stdc++.h>
using namespace std;
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	freopen("in.txt","r",stdin);
	freopen("out.txt","w",stdout);
	int n;
	cin >> n;
	string s;
	cin >> s;
	int l = (n-1)/2;
	string ans1="",ans2="";
	for(int i=0;i<l;i++){
		ans1+=s[i];
	}
	for(int i=l+1;i<n;i++){
		ans2+=s[i];
	}
	bool ok1=0,ok2=0;
	int cnt = 0;
	for(int i=l;i<n && cnt<l;i++){
		if(ans1[cnt] == s[i]){
			cnt++;
		}
	}
	ok1 = (cnt == l);
	cnt = 0;
	for(int i=0;i<=l && cnt<l;i++){
		if(ans2[cnt] == s[i]){
			cnt++;
		}
	}
	ok2 = (cnt ==l);
	if(!ok1 && !ok2){
		cout << "NOT POSSIBLE";
		return 0;
	}
	if(ok1 && ok2 && (ans1 != ans2)){
		cout << "NOT UNIQUE";
		return 0;
	}
	if(ok1){
		cout << ans1;
		return 0;
	}
	cout << ans2;
}

Compilation message (stderr)

friends.cpp: In function 'int main()':
friends.cpp:6:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
    6 |  freopen("in.txt","r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~
friends.cpp:7:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
    7 |  freopen("out.txt","w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 35
• Subtask 2: 0 / 65