LeetCode 每日一题 1723.完成所有工作的最短时间

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问题描述

简要思路

快过12点才想起来今天没打卡。打开一看，红色…上去就是一顿CV，再见。

代码

class Solution {
    
    
public:
    int minimumTimeRequired(vector<int> &jobs, int k) {
    
    
        int n = jobs.size();
        int len = 1 << n;

        // sum[i]表示工作分配情况为i所花费的时间
        vector<int> sum(len);
        sum[0] = 0;
        for (int i = 1; i < len; ++i) {
    
    
            int x = __builtin_ctz(i);
            int y = i - (1 << x);
            sum[i] = sum[y] + jobs[x];
        }

        // dp[i][j]表示第i个worker分配完工作，分配情况为j的最少时间
        vector<vector<int>> dp(k, vector<int>(len));
        for (int i = 0; i < len; ++i) {
    
    
            dp[0][i] = sum[i];
        }

        for (int i = 1; i < k; ++i) {
    
    
            for (int j = 0; j < len; ++j) {
    
    
                int minCost = 0x3f3f3f3f;
                for (int x = j; x; x = (x - 1) & j) {
    
    
                    minCost = min(minCost, max(dp[i - 1][x], sum[j - x]));
                }
                dp[i][j] = minCost;
            }
        }
        return dp[k - 1][len - 1];
    }
};