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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int solveOdd(const string& s) {
  5.     return 2;
  6. }
  7.  
  8. int solveEven(const string& s) {
  9.     if (s.length() % 2 == 1) {
  10.         return 2;
  11.     }
  12.     string lf = s.substr(0, s.length() / 2);
  13.     string rg = s.substr(s.length() / 2, s.length() / 2);
  14.     if (lf != rg) return 1;
  15.     return solveEven(lf);
  16. }
  17.  
  18.  
  19. int32_t main() {
  20.     ios_base::sync_with_stdio(false);
  21.     cin.tie(nullptr), cout.tie(nullptr);
  22.  
  23.     string s;
  24.     cin >> s;
  25.     if (s.length() < 3) {
  26.         cout << "Impossible" << endl;
  27.         return 0;
  28.     }
  29.     vector<int> cnt(255);
  30.     for(char c : s) {
  31.         ++cnt[c];
  32.     }
  33.     if (*max_element(cnt.begin(), cnt.end()) >= s.length() - 1) {
  34.         cout << "Impossible" << endl;
  35.         return 0;
  36.     }
  37.     cout << (s.length() % 2 == 0 ? solveEven(s) : solveOdd(s)) << endl;
  38.  
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
Impossible
https://ideone.com/mwSGec
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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