#include <bits/stdc++.h>
#define lsb(x) (x&(-x))

using namespace std;

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

int v[100005], aib[100005];
int n, m;

void update(int pos, int val) {
    while(pos <= n) {
        aib[pos] += val;
        pos += lsb(pos);
    }
}

int query(int pos) {
    int rez = 0;
    while(pos >= 1) {
        rez += aib[pos];
        pos -= lsb(pos);
    }
    return rez;
}

int main() {
    fin >> n >> m;
    for(int i = 1; i <= n; i++) {
        fin >> v[i];
        update(i, v[i]);
    }
    for(int i = 1; i <= m; i++) {
        int q; fin >> q;
        if(q == 0) {
            int poz, val; fin >> poz >> val;
            update(poz, val);
        }
        if(q == 1) {
            int a, b; fin >> a >> b;
            fout << query(b) - query(a-1) << "\n";
        }
        if(q == 2) {
            int a; fin >> a;
            int st = 1;
            int dr = n;
            int poz = 0;
            while(st <= dr) {
                int mid = (st+dr) / 2;
                int qq = query(mid);
                if(qq == a) {
                    poz = mid;
                    dr = mid - 1;
                } else {
                    if(qq > a) {
                        dr = mid - 1;
                    } else {
                        st = mid + 1;
                    }
                }
            }
            if(poz != 0) {
                fout << poz << "\n";
            } else {
                fout << -1 << "\n";
            }
        }
    }
    return 0;
}