Next greater number set digits

PROBLEM :

Given a number n, find the smallest number that has same set of digits as n and is greater than n. If x is the greatest possible number with its set of digits, then print “not possible”.

Input:

The first line of input contains an integer T denoting the number of test cases.
The first line of each test case is n,n is the number.

Output:

Print the greater number than n with same set of digits and if not possible then print "not possible" without double quote.

Constraints:

1 = T = 100
1 = n = 100000

Example:

Input
2
143
431

Output
314
not possible

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SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

#include<iostream>
using namespace std;
#include<string.h>
#include <algorithm>  // for sort() function
                 
char* Next_greater_number(char* ) ;
char* swap(char* ,int ,int ) ;

//char* sort(char* ,int ,int ) ;

int main()
 {
int t ;
char *str ;
str=(char*)malloc(100000*sizeof(char)) ;
cin>>t ;
while(t--)
{
   cin>>str ;
 
   str=Next_greater_number(str) ;
   cout<<str<<endl ;
}
return 0;
}

char* Next_greater_number(char* str)
{
    int l ;
    l=strlen(str) ;
 
    int i ;
    for(i=l-1;l>0;i--)
        if(str[i]>str[i-1])
            break ;
         
    if(i==0)
    {
    strcpy(str,"not possible") ;
    return str ;
    }
     
    int ele1,ele2 ;
    ele1=i-1 ;
    ele2=i ;
 
    for(i=i;i<l;i++)
        if(str[i]>str[ele1]&&str[i]<str[ele2])
            ele2=i ;
         
    str=swap(str,ele1,ele2) ;
 
    sort(str+ele1+1,str+l) ;       // can't use sorting algo as length of string is very large
 
    //str=sort(str,ele1,l) ;        
 
    return str ;
}

char* swap(char* str,int a,int b)
{
char temp ;

temp=str[a] ;
str[a]=str[b] ;
str[b]=temp ;

return str ;
}

/*
char* sort(char* str,int n1,int n2)
{
if(n1>=n2)
return str ;

int i,j,k ;
char temp ;
k=0 ;

for(i=n1;i<n2-1;i++)
{
for(j=n1;j<n2-k;j++)
{
if(str[j]>str[j+1])
{
temp=str[j] ;
str[j]=str[j+1] ;
str[j+1]=temp ;
k++ ;
}
}
}
return str ;
}                                              */                                

---------------------------------------------------------------------------------

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