四平方和

代码：

from copy import deepcopy
n = int(input())
maxn = int(5e6) + 10
dic = dict()
for a in range(maxn):
    if a * a > n:
        break
    for b in range(a,maxn):
        if a * a + b * b > n:
            break
        if dic.get(a*a+b*b) is None:
            dic[a*a+b*b] = (a,b)
ans = [maxn for _ in range(4)]
for a in sorted(dic.keys()):
    b = n - a
    if a > b:
        break
    if b in dic.keys():
        tmp = list(dic[a]+dic[b])
        tmp.sort()
        for i in range(4):
            if tmp[i] != ans[i]:
                if tmp[i] < ans[i]:
                    ans = deepcopy(tmp)
                break
for i in range(3):
    print(ans[i], end = ' ')
print(ans[-1])

作者：波尔k
链接：https://www.acwing.com/activity/content/code/content/8139085/
来源：AcWing
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