#include <fstream>
#include <iostream>
#include <vector>

using namespace std;

void actualizare(vector <int> &aib, int p, int val) {
    int n = (int)aib.size() - 1;
    while (p <= n) {
        aib[p] += val;
        int putere = (p & (-p));
        p += putere;
    }
}

int interogare(vector <int> &aib, int p) {
    int n = (int)aib.size() - 1, suma = 0;
    while (p > 0) {
        suma += aib[p];
        int putere = (p & (-p));
        p -= putere;
    }
    return suma;
}

int interogare_poz_min(vector <int> &aib, int s) {
    // cautam (binar) cea mai mica pozitie pe care avem interogare >= s
    int n = (int)aib.size() - 1;
    int st = 1, dr = n, rez = n + 1;
    while (st <= dr) {
        int m = (st + dr) / 2;
        if (interogare(aib, m) >= s) {
            rez = m;
            dr = m - 1;
        } else {
            st = m + 1;
        }
    }
    if (rez > n || interogare(aib, rez) > s) {
        rez = -1;
    }
    return rez;
}

int main() {
    ifstream in("aib.in");
    ofstream out("aib.out");
    int n, nr_op;
    in >> n >> nr_op;
    vector <int> aib(n + 1, 0);
    for (int i = 1; i <= n; i++) {
        int val;
        in >> val;
        actualizare(aib, i, val);
    }
    for (int i = 0; i < nr_op; i++) {
        int tip;
        in >> tip;
        if (tip == 0) {
            int poz, val;
            in >> poz >> val;
            actualizare(aib, poz, val);
        } else if (tip == 1) {
            int a, b;
            in >> a >> b;
            out << interogare(aib, b) - interogare(aib, a - 1) << "\n";
        } else {
            int s;
            in >> s;
            out << interogare_poz_min(aib, s) << "\n";
        }
    }
    in.close();
    out.close();
    return 0;
}