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- /******************************************************************************
- Welcome to GDB Online.
- GDB online is an online compiler and debugger tool for C, C++, Python, PHP, Ruby,
- C#, VB, Perl, Swift, Prolog, Javascript, Pascal, HTML, CSS, JS
- Code, Compile, Run and Debug online from anywhere in world.
- *******************************************************************************/
- #include <iostream>
- using namespace std;
- #define mx 100001
- int arr[mx];
- int tree[mx * 3];
- void init(int node, int b, int e)
- {
- if (b == e) {
- tree[node] = arr[b];
- return;
- }
- int Left = node * 2;
- int Right = node * 2 + 1;
- int mid = (b + e) / 2;
- init(Left, b, mid);
- init(Right, mid + 1, e);
- tree[node] = tree[Left] + tree[Right];
- }
- int query(int node, int b, int e, int i, int j)
- {
- if (i > e || j < b)
- return 0;
- if (b >= i && e <= j)
- return tree[node];
- int Left = node * 2;
- int Right = node * 2 + 1;
- int mid = (b + e) / 2;
- int p1 = query(Left, b, mid, i, j);
- int p2 = query(Right, mid + 1, e, i, j);
- return p1 + p2;
- }
- void update(int node, int b, int e, int i, int newvalue)
- {
- if (i > e || i < b)
- return;
- if (b >= i && e <= i) {
- tree[node] = newvalue;
- return;
- }
- int Left = node * 2;
- int Right = node * 2 + 1;
- int mid = (b + e) / 2;
- update(Left, b, mid, i, newvalue);
- update(Right, mid + 1, e, i, newvalue);
- tree[node] = tree[Left] + tree[Right];
- }
- int main()
- {
- int n,i,j,k,l,p;
- cin >> n;
- for(i=1;i<=n;i++)
- cin>> arr[i];
- init(1, 1, n);
- cin>>j>>k;
- cout << query(1, 1, n, j, k) << endl;
- cin>>l>>p;
- update(1, 1, n, l, p);
- cout << query(1, 1, n, j, k) << endl;
- return 0;
- }
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