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  1. # your code goes here
  2. n=int(input())
  3. c=1
  4. for i in range(1,n+1):
  5. for j in range(1,i+1):
  6. print(c,end=" ")
  7. c=c+1
  8. print(end="\n")
  9.  
Success #stdin #stdout 0.1s 14156KB
stdin
5
stdout
1 
2 3 
4 5 6 
7 8 9 10 
11 12 13 14 15