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Pinta 2.2-development, the screen unexpectedly move when zoom and use magic wand and change tolerance

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**Description** The screen unexpectedly move when zoom and use magic wand and change tolerance. **To Reproduce** 1. Open a image, zoom so that you can see vertical and horizontal scrollbars...

### 3-1题 和leetcode#287相似, 3-2题就是leetcode#287 书上用的cycle sort算法, 但是最优解还是cycle detection算法, #287的最优解可以沿用 ### 47题基本对应64. Minimum Path Sum https://leetcode.com/problems/minimum-path-sum/ 把最大改成最小就是一样的题目了 解法都是bellman-ford+拓扑排序求最短路的解法(表现为一个二维dp) 求最大把边取反即可 ### 65题是371. Sum of Two Integers ### 66题是238. Product of Array Except...