Need help related to codeforces problem A. Acacius and String

help
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1

Can anyone spot the problem here? Its failing on test case 2 upon submission :frowning: 

#include <bits/stdc++.h>

using namespace std;

#define ll long long

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    string s;
    cin >> s;
    string pat = "abacaba";
    int flag = 0, cnt = 0;
    for (int i = 0; i < n - pat.length() + 1; i++) {
      if (s.substr(i, 7) == pat) cnt++;
    }
    if (cnt > 1)
      cout << "No\n";
    else if (cnt == 1) {
      for (int i = 0; i < n; i++) {
        if (s[i] == '?') s[i] = 'd';
      }
      cout << "Yes\n" << s << endl;
    } else if (cnt == 0) {
      for (int i = 0; i < n - pat.length() + 1; i++) {
        if (flag == 1) break;
        for (int j = 0; j < i + pat.length(); j++) {
          if (s[i + j] != pat[j] && s[i + j] != '?') break;
          if (s[i + j] == '?') s[i + j] = pat[j];
          if (j == pat.length() - 1) {
            cnt++, flag = 1;
            break;
          }
        }
      }
      for (int i = 0; i < n; i++) {
        if (s[i] == '?') s[i] = 'd';
      }
      if (cnt == 1 && flag == 1)
        cout << "Yes\n" << s << endl;
      else
        cout << "No\n";
    }
  }
  return 0;
}
2

You can view test details to find out the exact test.

1 Like
3

1
11
abac???caba

4

Solved the problem…needed to change a few things :smiley: