Submission #44321

#	Time	Username	Problem	Language	Result	Execution time	Memory
44321		dhruvsomani	Three Friends (BOI14_friends)	C++14	100 / 100	31 ms	5692 KiB

friends

#include <iostream>
#include <iomanip>
#include <fstream>

#include <cmath>
#include <string>

#include <algorithm>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;

int n;
string s, temp;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);

	cin >> n;
	cin >> s;

	if (n%2 == 0) {
		cout << "NOT POSSIBLE";
		return 0;
	}

	set<string> count;

	int one, two;
	bool done, poss;

	one = 0;
	two = n/2 + 1;
	done = false;
	poss = true;
	temp = "";

	while((two < n) && (temp.size() < n/2)) {
		if (s[one] != s[two]) {
			if (!done) {
				done = true;
				one++;
			}
			else {
				poss = false;
				break;
			}
		}
		else {
			temp += s[one];
			one++;
			two++;
		}
	}

	if (poss) count.insert(temp);

	one = 0;
	two = n/2;
	done = false;
	poss = true;
	temp = "";

	while((two < n) && (temp.size() < n/2)) {
		if (s[one] != s[two]) {
			if (!done) {
				done = true;
				two++;
			}
			else {
				poss = false;
				break;
			}
		}
		else {
			temp += s[one];
			one++;
			two++;
		}
	}
	
	if (poss) count.insert(temp);

	if (count.size() == 0) cout << "NOT POSSIBLE";
	else if (count.size() == 1) cout << *(count.begin());
	else cout << "NOT UNIQUE";

	return 0;
}

Compilation message (stderr)

friends.cpp: In function 'int main()':
friends.cpp:48:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while((two < n) && (temp.size() < n/2)) {
                      ~~~~~~~~~~~~^~~~~
friends.cpp:74:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while((two < n) && (temp.size() < n/2)) {
                      ~~~~~~~~~~~~^~~~~

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