给定正整数 n,找到若干个完全平方数(比如 1, 4, 9, 16, ...) 使得他们的和等于 n.你需要让平方数的个数最少.比如 n = 12,返回 3 ,因为 12 = 4 + 4 + 4 : 给定 n = 13,返回 2 ,因为 13 = 4 + 9. 详见:https://leetcode.com/problems/perfect-squares/description/ Java实现: 方法一:递归实现 class Solution { public int numSquares(i…

题目 Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. 给定正整数 n,找到若干个完全平方数(比如 1, 4, 9, 16, ...)使得它们的和等于 n.你需要让组成和的完全平方数的个数最少. Example 1: Input: n = 12 Output: 3 Explanation: 12 =…

Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. Example 1: Input: n = 12 Output: 3 Explanation: 12 = 4 + 4 + 4. Example 2: Input: n = 13 Output: 2 Explanation: 13 = 4 + 9. Cr…

We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself. Now, given an integer n, write a function that returns true when it is a perfect number and false when it is not. Example: Input:…

https://leetcode.com/problems/perfect-squares/ 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, retur…

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. 解析: 利用动态规划解决此问题:对于要求的当前节…

Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. Example 1: Input: n = 12 Output: 3 Explanation: 12 = 4 + 4 + 4. Example 2: Input: n = 13 Output: 2 Explanation: 13 = 4 + 9.---…

原题链接 题意: 给一个非整数,算出其最少可以由几个完全平方数组成(1,4,9,16……) 思路: 可以得到一个状态转移方程  dp[i] = min(dp[i], dp[i - j * j] + ); 代码如下: Runtime: 60 ms, faster than 69.83% 有点慢 class Solution { public: int numSquares(int n) { ]; ; i <= n; i++) { dp[i] = i; ; j * j <= i; j++) { d…

题目来源:Light OJ 1288 Subsets Forming Perfect Squares 题意:给你n个数 选出一些数 他们的乘积是全然平方数 求有多少种方案 思路:每一个数分解因子 每隔数能够选也能够不选 0 1表示 然后设有m种素数因子 选出的数组成的各个因子的数量必须是偶数 组成一个m行和n列的矩阵 每一行代表每一种因子的系数 解出自由元的数量 #include <cstdio> #include <cstring> #include <algorithm&…

原文地址 https://www.jianshu.com/p/2925f4d7511b 迫于就业的压力,不得不先放下 iOS 开发的学习,开始走上漫漫刷题路. 今天我想聊聊 LeetCode 上的第279题-Perfect Squares,花了挺长时间的,试了很多方法,作为一个算法新手,个人感觉这题很好,对我的水平提升很有帮助.我在这里和大家分享一下我的想法.下面是题目: Given a positive integer n, find the least number of perfect s…