Submission #653137

#	Time	Username	Problem	Language	Result	Execution time	Memory
653137		aryan12	Three Friends (BOI14_friends)	C++17	Compilation error	0 ms	0 KiB

friends

#include <bits/stdc++.h>
using namespace std;
string s,t;
int l,r,i,p,n,f,g;
bool f,g;

bool check() {
    p = 0;
    for(i = l; i <= r; i++) {
        if(p != t.size() && t[p] == s[i]) {
            p++;
        }
    }
    return (p == t.size());
}

int32_t main() {
    cin >> n;
    cin >> s;
    if(n % 2 == 0) {
        cout << "NOT POSSIBLE\n";
        return;
    }
    t = s.substr(0, n / 2);
    l = n / 2;
    r = n - 1;
    f = check();
    t = s.substr(n - n / 2, n / 2);
    l = 0;
    r = n / 2;
    g = check();
    if(!f && !g) {
        cout << "NOT POSSIBLE\n";
    }
    else if(f && g && s.substr(0, n / 2) != s.substr(n - n / 2, n / 2)) {
        cout << "NOT UNIQUE\n";
    }
    else if(f) {
        cout << s.substr(0, n / 2) << "\n";
    }
    else {
        cout << s.substr(n - n / 2, n / 2) << "\n";
    }
}

Compilation message (stderr)

friends.cpp:5:6: error: conflicting declaration 'bool f'
    5 | bool f,g;
      |      ^
friends.cpp:4:15: note: previous declaration as 'int f'
    4 | int l,r,i,p,n,f,g;
      |               ^
friends.cpp:5:8: error: conflicting declaration 'bool g'
    5 | bool f,g;
      |        ^
friends.cpp:4:17: note: previous declaration as 'int g'
    4 | int l,r,i,p,n,f,g;
      |                 ^
friends.cpp: In function 'bool check()':
friends.cpp:10:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |         if(p != t.size() && t[p] == s[i]) {
      |            ~~^~~~~~~~~~~
friends.cpp:14:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     return (p == t.size());
      |             ~~^~~~~~~~~~~
friends.cpp: In function 'int32_t main()':
friends.cpp:22:9: error: return-statement with no value, in function returning 'int32_t' {aka 'int'} [-fpermissive]
   22 |         return;
      |         ^~~~~~