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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long int
  4. #define pb push_back
  5. #define mp make_pair
  6.  
  7. ll func(char a, char b, char c, char d){
  8. 	if(a == b){
  9. 		if((c != d) && (c != a) && (d != a)){//cout << "ok\n";
  10. 			return 2;
  11. 		}
  12.  
  13. 		else if((c != d) && ((c == a) || (d == a))){
  14. 			return 1;
  15. 		}
  16.  
  17. 		else if(c == a && d == a)
  18. 		return 0;
  19.  
  20. 		else if((c == d) && (c != a))
  21. 		return 0;
  22. 	}
  23.  
  24. 	else{
  25. 		if((c != d) && (c != a) && (c != b) && (d != a) && (d != b))
  26. 		return 2;
  27.  
  28. 		else if((c != d) && (((c == a) && (d == b)) || ((c == b) && (d == a))))
  29. 		return 0;
  30.  
  31. 		else if((c != d) && ((c == a) || (c == b) || (d == a) || (d == b)))
  32. 		return 1;
  33.  
  34. 		else if((c == d) && ((c == a) || (c == b)))
  35. 		return 1;
  36.  
  37. 		else if((c == d) && ((c != a) && (c != b)))
  38. 		return 1;
  39. 	}
  40. 	return 0;
  41. }
  42.  
  43. int main() {
  44. 	ios_base::sync_with_stdio(false);
  45.     cin.tie(NULL);
  46.  
  47.     int n;
  48.     cin >> n;
  49.     string a, b;
  50.     cin >> a >> b;
  51.     //cout << func('a', 'a', 'c', 'b') << endl;
  52.     ll ans = 0;
  53.     for(int i = 0, j = n-1; i <= j; i++, j--){//cout << i << " " << j << endl;
  54.             if(i == j){
  55.             	if(a[i] != b[i])
  56.             	ans++;
  57.             }
  58.             else
  59.     	ans += func(a[i], a[j], b[i], b[j]);
  60.     //	cout << ans << endl;
  61.     }
  62.  
  63.     cout << ans;
  64. 	return 0;
  65. }
Success #stdin #stdout 0s 4196KB
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https://ideone.com/BcjYgN
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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