"binary index tree c++" Code Answer's

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binary index tree c++

Tired Toucan on Apr 30, 2021

class bit{
public:
    int n;
    vector<int> tree;

    bit(){};
    bit(int _n){
        n=_n;
        tree.resize(n+1);
    };

    void update(int idx,int val){
        while(idx<=n){
            tree[idx]+=val;
            idx+=idx&(-idx);
        }
    };

    int read(int idx){
        int res=0;
        while(idx>0){
            res+=tree[idx];
            idx-=idx&(-idx);
        }
        return res;
    };

    int sum(int L,int R){
        return read(R)-read(L-1);
    };
};

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"binary index tree c++" Code Answer's