Python/Java/C++/Go 代码：
- Q1 https://leetcode.cn/problems/alternating-groups-i/solution/on-zuo-fa-pythonjavacgo-by-endlesscheng-fofz/
- Q2 https://leetcode.cn/problems/maximum-points-after-enemy-battles/solution/nao-jin-ji-zhuan-wan-pythonjavacgo-by-en-k22y/
- Q3 https://leetcode.cn/problems/alternating-groups-ii/solution/jian-ji-xie-fa-pythonjavacgo-by-endlessc-fzva/
- Q4 https://leetcode.cn/problems/number-of-subarrays-with-and-value-of-k/solution/jian-ji-xie-fa-o1-kong-jian-pythonjavacg-u7fv/