#include <iostream>
#include <set>
using namespace std;
const int maxn = 200005;
typedef long long ll;
const int INF = 2e9;
int n, a[maxn];

ll segment_tree[3 * maxn];

ll merge_nodes(ll A, ll B) {
    return A + B;
}

void build_tree(int L = 0, int R = n - 1, int node = 1) {
    if(L == R) {
        segment_tree[node] = a[L];
    }
    else {
        int middle = (L + R) / 2;
        build_tree(L, middle, 2 * node);
        build_tree(middle + 1, R, 2 * node + 1);
        segment_tree[node] = merge_nodes(segment_tree[2 * node], segment_tree[2 * node + 1]);
    }
}

ll query(int i, int j, int L = 0, int R = n - 1, int node = 1) {
    if(R < i or j < L) {
        return 0;
    }
    if(i <= L and R <= j) {
        return segment_tree[node];
    }

    int middle = (L + R) / 2;
    ll left_side = query(i, j, L, middle, 2 * node);
    ll right_side = query(i, j, middle + 1, R, 2 * node + 1);

    return merge_nodes(left_side, right_side);
}

void update(int idx, int new_value, int L = 0, int R = n - 1, int node = 1) {
    if(L == R) {
        segment_tree[node] = new_value;
        return;
    }

    int middle = (L + R) / 2;
    if(idx <= middle) {
        update(idx, new_value, L, middle, 2 * node);
    }
    else {
        update(idx, new_value, middle + 1, R, 2 * node + 1);
    }

    segment_tree[node] = merge_nodes(segment_tree[2 * node], segment_tree[2 * node + 1]);
}
int main() {
    ios_base::sync_with_stdio(false);
    int q;

    cin >> n >> q;

    for(int i = 0; i < n; i++) {
        cin >> a[i];
    }
    build_tree();

    for(int i = 0; i < q; i++) {
        int type;
        cin >> type;

        if(type == 1) {
            int idx, new_value;
            cin >> idx >> new_value;

            update(idx - 1, new_value);
        }
        else {
            int a, b;
            cin >> a >> b;

            cout << query(a - 1, b - 1) << endl;
        }

    }



    return 0;
}