#include <bits/stdc++.h>

using namespace std;

ifstream fin("aib.in");
ofstream fout("aib.out");

#define N_MAX 100000

int v[N_MAX], aib[N_MAX];
int n;

int query(int x) {
    int sum = 0;
    while(x > 0) {
        sum += aib[x];
        x -= (x & (-x));
    }

    return sum;
}

void update(int x, int val) {
    while(x <= n) {
        aib[x] += val;
        x += (x & (-x));
    }
}

int findVal(int val) {
    int st, dr, mid, sum, res;
    st = 1;
    dr = n;
    res = -1;
    while(st <= dr) {
        mid = (st + dr) / 2;
        sum = query(mid);
        if(sum == val) {
            res = mid;
        }
        if(sum > val) {
            dr = mid - 1;
        }else{
            st = mid + 1;
        }
    }

    return res;
}

int main()
{
    int m, i, q, a, b;
    fin >> n >> m;
    for(i = 1; i <= n; ++i) {
        fin >> v[i];
        update(i, v[i]);
    }
    for(i = 0; i < m; ++i) {
        fin >> q >> a;
        if(q <= 1) {
            fin >> b;
        }

        if(q == 0) {
            update(a, b);
        }else if(q == 1) {
            fout << query(b) - query(a - 1) << '\n';
        }else{
            fout << findVal(a) << '\n';
        }
    }

    return 0;
}