输入整数n，计算1+(1+2)+(1+2+3)+··+(1+2+3+··+n)的和

Question

def sum(m):
s=0
for n in range(1,m+1):
s=s+n
return s
后面要怎么加？

Answer 1

def sum(m):
    s=0
    for n in range(1,m+1):
        s=s+n
    return s

res = 0
n = int(input())
for i in range(n+1):
    res+=sum(i)

print(res)