【leetcode】树状数组逆序 | welcome



【leetcode】树状数组逆序 | welcome

树状数组是一个数据结构，能很快的求出某一段到某一段的和，求解逆序数注意对下标映射的理解，另外本程序并没有解决有数相等的问题。关于x&(-x)，-x 是x 的补码；补码为取反+1。


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