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Leetcode-3737 Link : https://leetcode.com/problems/count-subarrays-with-majority-element-i Leetcode-3739 Link : https://leetcode.com/problems/count-subarrays-with ...

核心目的：在使用队列实现栈时，应满足队列前端的元素是最后入栈的元素 queue1用于存储栈内的元素，queue 2作为入栈操作的辅助队列。 入栈时，先放入2中， 将1里面的元素都放到2里面，此时2的第一个元素即为栈顶元素，再将1和2交换即可实现栈 出栈就看1就好 ...