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AKVQLD03

                           AKVQLD03 - How to Handle the Fans


#include <iostream>
#include <cstring>
#include <cmath>

using namespace std;


void addNode(long long int seg[], int l, int r, int pos, int index, int val)
{
    if(l == r)
    {
        seg[index] += val;
    }
    else
    {
        int mid = (l + r) / 2;

        if(pos >= l && pos <= mid)
        {

            addNode(seg, l, mid, pos, 2 * index + 1, val);
        }
        else
        {
            addNode(seg, mid + 1, r, pos, 2 * index + 2, val);
        }

        seg[index] = seg[2 * index + 1] + seg[2 * index + 2];
    }

}

int findSum(long long int seg[], int l, int r, int qs, int qe, int index)
{

    if(qe < l || qs > r)
        return 0;

    if(qs <= l && qe >= r)
        return seg[index];

    int mid = (l + r) / 2;

    int p1 = findSum(seg, l, mid, qs, qe, 2 * index + 1);
    int p2 = findSum(seg, mid + 1, r, qs, qe, 2 * index + 2);

    return p1 + p2;
}


int main()
{

    long int n, q;
    int  a, b;

    cin >> n >> q;

    cin.get();

    const long int h = ceil(log2(n));

    const long int size = 2 * pow(2 , h);

    long long int seg[size];

    for(int i = 0; i < size - 1; i++)
        seg[i] = 0;



    string st;

    while(q--)
    {
        cin >> st;
        cin >> a >> b;
        cin.get();

        if(st == "add")
        {
            addNode(seg, 0, n - 1, a - 1, 0, b);
        }
        else
        {
            cout << findSum(seg, 0, n - 1, a - 1, b - 1, 0) << endl;
        }
    }

    return 0;
}

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