Print Pyramid
Problem
Given N, the number of rows of a right-hand pyramid.
Your task is to print the pyramid.
For N<0, print -1.
Example Input
N=5
Example Output
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
Example Input 2
3
Example Output 2
1
1 2
1 2 3
Time Limit: 5
Memory Limit: 256
Source Limit:
