OJ Board

Here is my code:
#include <iostream>
#include<algorithm>

using namespace std;

int main()
{
int a,b=0,c;
string str[10000],s,q,r;
char ch;
cin>>a;
for(int i=0;i<a;i++)
{
cin>>s;
for(int k=0;k<s.length()-1;k++)
{
for(int l=k+1;l<s.length();l++)
{
if(s[k]>s[l])
{
ch=s[l];
s[l]=s[k];
s[k]=ch;
}
}
}
do
{

str=s;
b++;

}while(std::next_permutation(s.begin(),s.end()));
sort(str,str+b);
for(int j=0;j<b;j++)
{
cout<<str[j]<<endl;
}
if(i!=a-1)
cout<<endl;
b=0;
}
return 0;
}
I am getting runtime error. Please help. Thank You in advance.

Don't double post

You must increase array limit It must be at least 10! = 3628800. But i checked that 362880 (9!) is enough. Maybe judge input contains strings with length < 10.

Change it to

A blank line should follow each output set.

Change this It must be And you don't need to sort permutations. It will be generated in ascending sorted order.

Don't forget to remove your code after getting accepted.