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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. bool validCharacter(char c) {
  6. 	return isalpha(c);
  7. }
  8.  
  9. bool isP(const string& s) {
  10. 	int lo = 0;
  11.     int hi = s.size() - 1;
  12.     while (lo < hi) {
  13.         while (!validCharacter(s[lo])) {
  14.             ++lo;
  15.         }
  16.         while (!validCharacter(s[hi])) {
  17.             --hi;
  18.         }
  19.         if (tolower(s[lo]) != tolower(s[hi])) {
  20.             return false;
  21.         }
  22.         ++lo;
  23.         --hi;
  24.     }
  25.     return true;
  26. }
  27.  
  28. int main() {
  29. 	string s = "tab a cat";
  30. 	cout << isP(s) << endl;
  31. }
Success #stdin #stdout 0s 5284KB
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https://ideone.com/ukX8tD
language:
C++14 (gcc 8.3)
created:
43 days ago
visibility:
public

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