#include <bits/stdc++.h>

using namespace std;

const int NMAX = 100003;

int n, q;
int v[NMAX];
int t[NMAX];

int lsb(int x) { return (x & (-x)); }

void add(int idx, int val) {
    for(int i = idx; i <= n; i += lsb(i)) {
        t[i] += val;
    }
}

int get_sum(int x) {
    int ans = 0;
    for(int i = x; i >= 1; i -= lsb(i)) {
        ans += t[i];
    }
    return ans;
}


int sum(int x, int y) {
    return get_sum(y) - get_sum(x - 1);
}

int query(int x) {
    int l = 1, r = n, last = -1;
    while(r - l >= 0) {
        int mid = (l + r) / 2, s = get_sum(mid);
        if(s >= x) {
            last = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }
    return (get_sum(last) == x ? last : -1);
}

int main() {

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

    in >> n >> q;

    for(int i = 1; i <= n; i++) {
        in >> v[i];
        add(i, v[i]);
    }

    while(q--) {
        int type;
        in >> type;
        if(type == 0) {
            int x, y;
            in >> x >> y;
            add(x, y);
        } else if(type == 1) {
            int x, y;
            in >> x >> y;
            out << sum(x, y) << '\n';
        } else {
            int x;
            in >> x;
            out << query(x) << '\n';
        }
    }

    return 0;
}