Find Common Characters LeetCode solution in C++

1
class Solution {
2
 public:
3
  vector<string> commonChars(vector<string> &words) {
4
    vector<string> ans;
5
    vector<int> v(26, 0);
6
    for (int i = 0; i < words.size(); i++) {
7
      vector<int> tmp(26, 0);
8
      for (auto ch : words[i]) {
9
        tmp[ch - 'a']++;
10
      }
11
      if (i == 0) {
12
        for (int i = 0; i < 26; i++) v[i] = tmp[i];
13
      } else
14
        for (int i = 0; i < 26; i++) v[i] = min(v[i], tmp[i]);
15
    }
16
    for (int i = 0; i < 26; i++) {
17
      while (v[i]--) {
18
        string s;
19
        char c = 'a' + i;
20
        s.push_back(c);
21
        ans.push_back(s);
22
      }
23
    }
24
    return ans;
25
  }
26
};