25 lines
603 B
C++
25 lines
603 B
C++
constexpr int MAXN=1e5+10;
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int cnt,root;
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int d[MAXN*2],ls[MAXN*2],rs[MAXN*2];
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void update(int s,int t,int &p,int x,int c){ // add constant c to #x
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if(!p)p=++cnt; // create node
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if(s==t){
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d[p]+=c;
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return;
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}
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int m=s+(t-s>>1);
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if(x<=m)update(s,m,ls[p],x,c);
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else update(m+1,t,rs[p],x,c);
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d[p]=d[ls[p]]+d[rs[p]];
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}
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int query(int s,int t,int p,int l,int r){ // query range [l,r]
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if(!p)return 0;
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if(l<=s&&t<=r)return d[p];
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int m=s+(t-s>>1),sum=0;
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if(l<=m)sum+=query(s,m,ls[p],l,r);
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if(r>m) sum+=query(m+1,t,rs[p],l,r);
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return sum;
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}
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