// my code is not passing only one test case can anyone help why ?

string isValid(string s) {

// cnt[i] stores frequency of character i+'a' int cnt[26] = {0}, n = s.length();

for (int i = 0; i < n; i++) { // increasing frequency cnt[s[i] - 'a']++; }

for (int i = 0; i < 26; i++) { // if character i+'a' is not present in string continue if (cnt[i] == 0) continue;

  cnt[i]--;

// if we insert all positive frequencies into a set, it should contain
// only 1 element if string is now valid
set<int> myset;

// insert remaining positive frequencies into set
for (int j = 0; j < 26; j++) {
  if (cnt[j]) myset.insert(cnt[j]);
}

// if set size is 1, string is now valid
if (myset.size() <= 1) return "YES";

// increase the frequency back again
  cnt[i]++;

}

return "NO";

}