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  1.     #include<cstdio>
  2.     #include<algorithm>
  3.     using namespace std;
  4.     int main()
  5.     {
  6.         char a[1000000];
  7.         int t,n,i;
  8.         scanf("%d ",&t);
  9.         while(t-->0)
  10.         {
  11.             scanf("%d",&n);
  12.             for(i=0;i<n;i++)
  13.             {
  14.                 scanf(" %c",&a[i]);
  15.             }
  16.             //for(i=0;i<n;i++)
  17.            // printf("%c",a[i]);
  18.            // printf("\n");
  19.             if(n==1)
  20.             printf("-1\n");
  21.             else
  22.             {   
  23.                 for(i=n-2;i>=0;i--)
  24.                 {
  25.                     if(a[i]<a[i+1])
  26.                     break;   
  27.                 }
  28.             }
  29.                 if(i<0)
  30.                 printf("-1\n");
  31.                 else
  32.                 {
  33.                 	//printf("%d\n",i);
  34.                     char temp=a[i];
  35.                     for(int j=n-1;j>i;j--)//finding highest index j such that a[j]>a[i]
  36.                     {
  37.                     	if(a[i]<a[j])
  38.                     	{ 
  39.                     		//printf("%d\n",j);
  40.                     		a[i]=a[j];
  41.                     		a[j]=temp;  //swapping a[j] & a[i]
  42.                     	//	printf("%c%c\n",a[i],a[j]);
  43.                     	}
  44.                     }
  45.                 }
  46.                 //for(i=0;i<n;i++)   this step was giving run time error
  47.                 //printf("%c",a[i]);
  48.                 printf("\n");
  49.                 sort(a+i+1,a+n);
  50.                 for(int j=0;j<n;j++)printf("%d",a[j]);
  51.        printf("\n");
  52.         }
  53.         return 0;
  54.     }
Success #stdin #stdout 0s 3992KB
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stdin
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2

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stdout
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4953565152

49525552535652495450
https://ideone.com/GvvvrN
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
secret

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