C++ | Leetcode C++题解之第368题最大整除子集

题目：

题解：

class Solution {
public:vector<int> largestDivisibleSubset(vector<int>& nums) {int len = nums.size();sort(nums.begin(), nums.end());// 第 1 步：动态规划找出最大子集的个数、最大子集中的最大整数vector<int> dp(len, 1);int maxSize = 1;int maxVal = dp[0];for (int i = 1; i < len; i++) {for (int j = 0; j < i; j++) {// 题目中说「没有重复元素」很重要if (nums[i] % nums[j] == 0) {dp[i] = max(dp[i], dp[j] + 1);}}if (dp[i] > maxSize) {maxSize = dp[i];maxVal = nums[i];}}// 第 2 步：倒推获得最大子集vector<int> res;if (maxSize == 1) {res.push_back(nums[0]);return res;}for (int i = len - 1; i >= 0 && maxSize > 0; i--) {if (dp[i] == maxSize && maxVal % nums[i] == 0) {res.push_back(nums[i]);maxVal = nums[i];maxSize--;}}return res;}
};