Leetcode 279 Perfect Squares
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Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...
) which sum to n.
For example, given n = 12
, return 3
because 12 = 4 + 4 + 4
; given n = 13
, return 2
because 13 = 4 + 9
.
Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.
两种思路:
1.Lagrange's four-square定理指出,任意一个自然数都可以用4个自然数平方之和表示
用两个set分别表示可以用1、2个自然数平方之和表示的数,如果可以用这两个集合中的数之和表示的则返回3,否则4。
2.DP
0 0
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