Submission #728783

#	Time	Username	Problem	Language	Result	Execution time	Memory
728783		rominanafu	Three Friends (BOI14_friends)	C++11	0 / 100	50 ms	5124 KiB

friends

#include <bits/stdc++.h>

using namespace std;

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

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

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

Compilation message (stderr)

friends.cpp: In function 'int main()':
friends.cpp:37:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   37 |     if ((r1.length() != len && r2.length() != len) || (n&1) == 0)
      |          ~~~~~~~~~~~~^~~~~~
friends.cpp:37:44: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   37 |     if ((r1.length() != len && r2.length() != len) || (n&1) == 0)
      |                                ~~~~~~~~~~~~^~~~~~
friends.cpp:39:26: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   39 |     else if (r1.length() != len)
      |              ~~~~~~~~~~~~^~~~~~
friends.cpp:41:26: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   41 |     else if (r2.length() != len)
      |              ~~~~~~~~~~~~^~~~~~

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