6
19
2014
59

Binary Indexed Tree

namespace bit{
    const int N=500000;
    int n,a[N+10];
    void add(int x,int d){for(;x<=n;x+=x&-x)a[x]+=d;}
    int sum(int x){int r=0;for(;x;x-=x&-x)r+=a[x];return r;}
}
Category: 未分类 | Tags: | Read Count: 704
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2022年9月10日 20:58

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