#include <cstdio>

int length, operations, task, BIT[100001], a, b;

__attribute__((always_inline)) void Update(int position, int value)
{
    for(int index = position; index <= length; index += index & -index)
    {
        BIT[index] += value;
    }
}

__attribute__((always_inline)) int Querry(int position)
{
    int sum = 0;

    for(int index = position; index; index -= index & -index)
    {
        sum += BIT[index];
    }

    return sum;
}

int Search(int sum)
{
    int left = 1, right = length, position = -1;

    while(left <= right){
        int middle = (left + right) / 2;
        int guess = Querry(middle);

        if(sum < guess){
            right = middle - 1;
        }else if(sum > guess){
            left = middle + 1;
        }else{
            position = middle;
            break;
        }
    }return position;
}

int main(){

    freopen("aib.in", "r", stdin);
    freopen("aib.out", "w", stdout);

    scanf("%d %d", &length, &operations);

    for(int i = 1; i <= length; i++)
    {
        scanf("%d", &a);

        Update(i, a);
    }

    while(operations--)
    {
        scanf("%d", &task);

        switch(task)
        {
            case 0: scanf("%d %d", &a, &b);
                    Update(a, b);
                    break;

            case 1: scanf("%d %d", &a, &b);
                    printf("%d\n", Querry(b) - Querry(a - 1));
                    break;

            case 2: scanf("%d", &a);
                    printf("%d\n", Search(a));
        }
    }

    return 0;
}