三角形

zhoumingzhen

n=int(input())
for i in range(1,n+1):
    for i1 in range(1,i+1):
        print("*",end="")
    print()
n=int(input())
for i in range(1,n+1):
    for i1 in range(1,n+2-i):
        print("*",end="")
    print()
n=int(input())
for i in range(1,n+1):
    print(" "*(n-i)+"*"*i)

zhoumingzhen

*
**
***
****
*****

*****
****
***
**
*

    *
   **
  ***
****
*****