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  1. #include <iostream>
  2. #include <string>
  3. #include <algorithm>
  4.  
  5. using namespace std;
  6.  
  7. int pow(int a, int b){
  8. 	int ans = 1;
  9. 	for(int i = 1; i <= b; i++)
  10. 		ans *= a;
  11. 	return ans;
  12. }
  13.  
  14. int nextGreaterElement(int n) {
  15.         string temp = to_string(n);
  16.         int len = temp.length();
  17.         if(len == 1)
  18.             return -1;
  19.         int i;
  20.         for(i = len-1; i >= 1; i--){
  21.             if((temp[i-1]-'0') < (temp[i]-'0'))
  22.                 break;
  23.         }
  24.         if(i == 0)
  25.             return -1;
  26.         i--;
  27.         cout<<i<<endl;
  28.         int j;
  29.         for(j = i+1; j < len && (temp[j]-'0') > (temp[i]-'0'); j++);
  30.         j--;
  31.         cout<<j<<endl;
  32.         char temp1 = temp[i];
  33.         temp[i] = temp[j];
  34.         temp[j] = temp1;
  35.         for(int x = 0; x < len; x++)
  36.         	cout<<temp[x];
  37.         cout<<endl;
  38.         string temp2 = temp.substr(i+1,len-1-i);
  39.         sort(temp.begin()+i+1,temp.end());
  40.         int ans = 0;
  41.         for(int i = len-1; i >= 0; i--){
  42.             int no1 = temp[i] - '0';
  43.             ans += no1*pow(10,len-1-i);
  44.         }
  45.         return ans;
  46.     }
  47.  
  48. int main(){
  49. 	int n = 21;
  50. 	cout<<nextGreaterElement(n)<<endl;
  51. }
Success #stdin #stdout 0s 16064KB
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-1
https://ideone.com/SDHVJe
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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