[Ubuntu] OpenSSH Server
- 2023.10.17
- Linux Ubuntu 22.04
安裝：sudo apt install openssh-server 查看 SSH server 狀態：sudo systemctl status ssh 正常執行中會顯示 Active: active (running)
[Linux] [掛載/卸載] USB 隨身碟
- 2023.10.16
- Linux Ubuntu 22.04
sudo mkdir /mnt/usb 找出 USB 隨身碟的 block device name：lsblk 掛載：sudo mount /dev/sd*1 /mnt/usb 卸載：sudo umount /dev/sd*1
Leetcode # 2867. Count Valid Paths in a Tree
- 2023.10.04
- ★★★ Hard LeetCode Mathematics Tree
Problem https://leetcode.com/contest/weekly-contest-364/problems/count-valid-paths-in-a-tree/ Notice! The relation of a and b in path(a, b) is not only relation between ancestor and descendant Testcas ...
Leetcode # 2875. Minimum Size Subarray in Infinite Array
- 2023.10.01
- ★★ Medium LeetCode Sliding Window
Problem https://leetcode.com/contest/weekly-contest-365/problems/minimum-size-subarray-in-infinite-array/ Solution: Sliding Window Time Complexity: O(n) Space Complexity: O(1) (The input and output ge ...
Leetcode # 2874. ⭐️ Maximum Value of an Ordered Triplet II
- 2023.10.01
- ★★ Medium Array LeetCode One-Pass Prefix Sum
Problem https://leetcode.com/contest/weekly-contest-365/problems/maximum-value-of-an-ordered-triplet-ii/ return max((nums[i] – nums[j]) * nums[k] for i, j, k ∈ 1, 2, …, n if i < j < ...
Leetcode # 2873. Maximum Value of an Ordered Triplet I
- 2023.10.01
- ★ Easy Array LeetCode Prefix Sum
Problem https://leetcode.com/contest/weekly-contest-365/problems/maximum-value-of-an-ordered-triplet-i/ Solution 請參考 Leetcode # 2874. Maximum Value of an Ordered Triplet II
[Data Structure] Graph
- 2023.10.01
- Data Structure Graph Topology
Definition Undirected Graph G = (V, E) V : Vertices 頂點 E : Edges 邊 := (u, v) Adjacent Vertexs A vertex u is adjacent to vertex v ⇔ (u, v) ∈ E Directed Graph｜Digraph G = (V, A) E : Arcs 邊 := (x, y); x ...
Leetcode # 2876. Count Visited Nodes in a Directed Graph
Problem https://leetcode.com/contest/weekly-contest-365/problems/count-visited-nodes-in-a-directed-graph/ Testcases # Input Expected 1 [7,0,7,0,5,3,3,0] [2,3,3,3,5,4,4,2] [3,6,1,0,5,7,4,3] [2,7,8,2, ...
Leetcode # 2870. Minimum Number of Operations to Make Array Empty
Problem https://leetcode.com/contest/biweekly-contest-114/problems/minimum-number-of-operations-to-make-array-empty/ Testcases # Input Expected 1 [14,12,14,14,12,14,14,12,12,12,12,14,14,12,14,14,14,12 ...
Leetcode # 2869. Minimum Operations to Collect Elements
Problem https://leetcode.com/contest/biweekly-contest-114/problems/minimum-operations-to-collect-elements/ The input is generated such that you can collect elements 1, 2, …, k. ⇒ find len(nums) ...
