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摘要: struct Fenwt { int n; ll sum[N]; void add(int x, int y) { if(x == 0) return sum[0] += y, void(); for(; x <= n; x += (x & -x)) sum[x] += y; } ll qzh(in 阅读全文
posted @ 2020-10-21 12:56 zhoukangyang 阅读(51) 评论(0) 推荐(0) 编辑