Sanalista

input/code.cpp: In function 'bool r(std::__cxx11::string)':
input/code.cpp:6:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(ll i = 0; i <= s.length(); i = s.find_first_not_of(c, i)) {
                   ~~^~~~~~~~~~~~~

#include <bits/stdc++.h>
using namespace std;
using ll=long long;
bool r(string s) {
    char c = 'a' - 1;
    for(ll i = 0; i <= s.length(); i = s.find_first_not_of(c, i)) {
        c = s[i];
        if(!(s.find_first_of(c) - s.find_last_of(c)) & 1) {
            return false;
        }
        
    }
    return true;
}
int main() {
    cin.tie(NULL);
    ios::sync_with_stdio(false);
    ll n,c=0;
    string s;
    vector<string> ss;
    cin>>n;
    for (ll i = 0; i < n; i++)
    {
        cin>>s;
        sort(s.begin(), s.end());
        ss.push_back(s);
    }
    for (auto &&e : ss)
    {   
        if(r(e))
            c++;
    }
    cout << c;
    
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: ACCEPTED