Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123Outpu...
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[LeetCode]7. Reverse Integer整數(shù)反轉(zhuǎn)
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[LeetCode]6. ZigZag ConversionZ 字形變換
The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows li...
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[LeetCode]5. Longest Palindromic Substring最長回文子串
Given a string s, find the longest palindromic substring in s. You may assume that the ...
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一次同步方法的失敗與原因總結(jié)
synchronized關(guān)鍵字可以設(shè)置同步方法和同步塊，同步方法會對調(diào)用對象this上鎖，所有線程進(jìn)入前都需要獲取這個鎖，這里我拿一個錯誤樣例來做示范 Thread-0取出8...
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java線程的狀態(tài)變換下面將會針這張圖對線程的狀態(tài)轉(zhuǎn)換來做解釋 在操作系統(tǒng)的課程中把線程大致分為了3個狀態(tài)1.就緒狀態(tài)（線程對資源上鎖，但未分配時間片，等待cpu分配，隨時可以運行）2.運行狀態(tài)（...
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SQL語句訓(xùn)練16-20
16題目描述統(tǒng)計出當(dāng)前各個title類型對應(yīng)的員工當(dāng)前薪水對應(yīng)的平均工資。結(jié)果給出title以及平均工資avg。CREATE TABLE salaries (emp_no i...
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[LeetCode]4. Median of Two Sorted Arrays尋找兩個有序數(shù)組的中位數(shù)
There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the medi...
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SQL語句訓(xùn)練11-15
11.題目描述獲取所有員工當(dāng)前的manager，如果當(dāng)前的manager是自己的話結(jié)果不顯示，當(dāng)前表示to_date='9999-01-01'。結(jié)果第一列給出當(dāng)前員工的emp...
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[LeetCode]3. Longest Substring Without Repeating Characters無重復(fù)字符的最長子串
Given a string, find the length of the longest substring without repeating characters. ...
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SQL語句訓(xùn)練6-10
題目地址https://www.nowcoder.com/activity/oj 6.查找所有員工入職時候的薪水情況，給出emp_no以及salary， 并按照emp_no進(jìn)...
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SQL語句訓(xùn)練1-5
題目地址https://www.nowcoder.com/activity/oj 1.題目描述查找最晚入職員工的所有信息CREATE TABLE employees (emp...
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[LeetCode]2. Add Two Numbers兩數(shù)相加
You are given two non-empty linked lists representing two non-negative integers. The di...
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[LeetCode]1. Two Sum兩數(shù)之和
Given an array of integers, return indices of the two numbers such that they add up to ...