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BITRSPU.cpp
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BITRSPU.cpp
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#include<bits/stdc++.h>
using namespace std;
int bit[10000];
#define block cout<<"----------------------\n"<<endl;
void update(int i,int val,int n)
{
i+=1;
while(i<=n)
{
bit[i]+=val;
i+=(i&(-i));
}
}
int sum(int i)
{
int res=0;
i+=1;
while(i>0)
{
res+=bit[i];
i-=(i&(-i));
}
return res;
}
int main()
{
int n;
cin>>n;
int arr[n];
for(int i=0;i<n;i++)
{
cin>>arr[i];
update(i,arr[i],n);
}
int q;
cin>>q;
while(q--)
{
int ty;
cin>>ty;
if(ty==1)
{
int ind,val;
cin>>ind>>val;
update(ind,val-arr[ind],n);
}
else
{
int l,r;
cin>>l>>r;
cout<<sum(r)-sum(l); // calculates sum from exclusive l and inclusive r
}
}
return 0;
}