exchanged = 0; // 发生了交换
Chickenpox is a highly contagious disease caused by the varicella zoster virus (VZV).
。关于这个话题，夫子提供了深入分析
Stack allocation of append-allocated slices
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* 解题思路：先对nums2用单调栈求每个元素的下一个更大值，存入Map缓存；再遍历nums1直接查Map得结果，这一点在同城约会中也有详细论述
/usr/local → /var/usrlocal