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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main(){
  4. 	 string s,center,pal;
  5. 	 cin>>s;
  6. 	int k=s.length();
  7. 	if(k%2==0){
  8. 		center="";
  9. 	}
  10. 	else{
  11. 		center=s[k/2];
  12. 	}
  13.  
  14.  
  15.  
  16. 	string left=s.substr(0,(k/2));
  17. 	string right=left;
  18. 	reverse(right.begin(),right.end());
  19. 	pal=left+center+right;
  20. 	if(pal>s){
  21. 		cout<<pal;
  22. 	}else{
  23. 		if(k%2==0)
  24. 		{cout<<(left[2])+1;
  25. 			for(int i=left.length()-1;i>=0;i--){
  26. 				if(left[i]+1>9){
  27. 					left[i]=0;
  28. 					continue;
  29. 				}
  30. 				else{
  31. 					left[i]=left[i]+1;
  32. 					break;
  33. 				}
  34.  
  35. 			}cout<<left;
  36. 			right=left;
  37. 	reverse(right.begin(),right.end());
  38. 	pal=left+center+right;
  39. 	cout<<pal;
  40.  
  41. 		}
  42.  
  43. 	}
  44.  
  45.  
  46.  
  47.  
  48.  
  49.  
  50.  
  51.  
  52.  
  53.  
  54. 	return 0;
  55. }
Success #stdin #stdout 0s 4292KB
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https://ideone.com/mxiLDg
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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