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  1. #include <bits/stdc++.h>
  2. #define IOS ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  3. using namespace std;
  4.  
  5. bool is_prefix(string main,string pre, int st = 0) {
  6.     if (st >= main.length()) return pre.empty();
  7.     if (pre.empty()) return true;
  8.     if (main[st] != pre[0]) return false;
  9.     return is_prefix(main, pre.substr(1), st + 1);
  10. }
  11. void solve() {
  12.     cout << is_prefix("abcdefgh", "abcd")<<endl;
  13.     cout << is_prefix("abcdefgh","")<<endl;
  14.     cout << is_prefix("abcdefgh","abd")<<endl;
  15. }
  16.  
  17. int main() {
  18.     IOS;
  19.     solve();
  20.     return 0;
  21. }
Success #stdin #stdout 0s 5284KB
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https://ideone.com/cd8zcd
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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