Find the all possible sub arrays of an array.

How to find the all possible sub arrays of an array efficiently ?

@rashedcs You are not allowed to ask questions related to ongoing contests, you have to solve these questions by yourselves, else wait for the editorials when the contest is over.

please abstain from asking questions related to on going contest. Try your best, if you can’t wait for editorial

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#include<stdio.h>
void main()
{
int a[3]={1,2,3};
int b[];
for(i=0;i<3;i++)
printf("%d",b[a[i]]);
}

//