Function solve

CPP/Segment Tree/Sum query.cpp:141–158

}

void solve(){
    ll n;
    cin>>n;
    vl vec(n);
    input(vec);

    vl segtree(4*n+1);
    //TreeBuild
    build_segtree(vec,1,0,n-1,segtree); //(input array,curr. vertex,start,end,segtree array,size)

    //Sum-query
    cout<<sum_segtree(1,0,n-1,0,2,segtree)<<endl;

    //Update-query
    update_segtree(1,0,n-1,2,3,segtree);
    cout<<sum_segtree(1,0,n-1,0,2,segtree)<<endl;

}

int main(){
ios_base::sync_with_stdio(false);