题解 + Python/Java/C++/Go 代码：
- Q1 https://leetcode.cn/problems/find-the-winning-player-in-coin-game/solution/o1-shu-xue-zuo-fa-pythonjavacgo-by-endle-427f/
- Q2 https://leetcode.cn/problems/minimum-length-of-string-after-operations/solution/tong-ji-zi-mu-chu-xian-ci-shu-fen-qi-ou-tyeho/
- Q3 https://leetcode.cn/problems/minimum-array-changes-to-make-differences-equal/solution/mei-ju-x-fen-lei-tao-lun-pythonjavacgo-b-puh2/
- Q4 https://leetcode.cn/problems/maximum-score-from-grid-operations/solution/tu-jie-dp-ji-qi-you-hua-by-endlesscheng-pco6/