#include<stdio.h>

​

int main(){

    for(int i =0; i<=5; i++)//loop responsible for writing columns

        {

        for(int j = 0; j<=i; j++)//loop responsible for writing rows

        {

            printf("%d ", j);

        }

        printf("\n");

    }

}

​

​

//output 

/*

0

0 1

0 1 2

0 1 2 3

0 1 2 3 4

0 1 2 3 4 5

*/