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A tough loop in a contest

Today I got a irritating question in a coding contest. I creamed through the first round but in the second round the following question got me in a trap.

Question: Input N = 4
          Output:
                 1
                 0 1
                 1 0 1
                 0 1 0 1

I tried many things but every time I failed.

Apart from this stupid wrong solution I tried many fancy stuff and failed in the end. What part of my C knowledge is weak?

If you were given this question how would you solve it?

Solution

  • This did the job for me.

    int i,j,flag;
int num=4;

flag=1;
for(i=0;i<num;i++)
{
    for(j=0;j<i+1;j++)
    {
            printf("%d",(j+flag)%2);
    }
    if(flag)
    {
            flag=0;
    }
    else
    {
            flag=1;
    }
    printf("\n");

 }