Submission #728761

#	Time	Username	Problem	Language	Result	Execution time	Memory
728761		rominanafu	Three Friends (BOI14_friends)	C++11	0 / 100	1081 ms	6120 KiB

friends

#include <bits/stdc++.h>

using namespace std;

int n, len;
string s;
string r1, r2;
bool unico = true;

bool posible(int x) {
    int ini = 0, fin = len;
    if (x < fin)
        fin++;
    while (ini <= len && fin < n) {
        if (ini == x)
            ini++;
        if (fin == x)
            fin++;
        if (fin == n) {
            break;
        }
        if (s[ini] != s[fin])
            return false;
        ini++;
        fin++;
    }
    return true;
}

int main() {
    ios_base::sync_with_stdio();
    cin.tie();
    cin >> n >> s;
    len = n/2;
    for(int i=0; i<n; i++) {
        if (posible(i)) {
            r2 = r1;
            if (i <= len)
                r1 = s.substr(len+1, len);
            else
                r1 = s.substr(0, len);
            if (r2.size() == len && r1 != r2) {
                unico = false;
                break;
            }
        }
    }
    if (r1.size() != len || n&1 == 0)
        cout << "NOT POSSIBLE\n";
    else if (!unico)
        cout << "NOT UNIQUE\n";
    else
        cout << r1 << '\n';
    return 0;
}

Compilation message (stderr)

friends.cpp: In function 'int main()':
friends.cpp:42:27: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   42 |             if (r2.size() == len && r1 != r2) {
      |                 ~~~~~~~~~~^~~~~~
friends.cpp:48:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   48 |     if (r1.size() != len || n&1 == 0)
      |         ~~~~~~~~~~^~~~~~
friends.cpp:48:33: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   48 |     if (r1.size() != len || n&1 == 0)
      |                               ~~^~~~

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