python leetcode 279. Perfect Squares
四平方和定理
class Solution(object):
def numSquares(self, n):
"""
:type n: int
:rtype: int
"""
import math
while n%4==0:
n=n//4
if n % 8 == 7:
return 4
for i in range(int(math.sqrt(n)),0,-1):
b = n - i*i
if b ==0:
return 1
for j in range(int(math.sqrt(b)),0,-1):
c = b - j*j
if c ==0:
return 2
return 3
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