LeetCode Daily Question 1723. The shortest time to complete all tasks
Problem Description
Brief idea
It was almost past 12 o'clock before I remembered that I didn't check in today. Open it up and see, it's red... It's a CV meal when you go up, goodbye.
the code
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];
}
};