using namespace std;
#include<iostream>
#include<fstream>

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

int n, m, op, x, y;
int v[100001];
int aib[100001];

int ub(int i) {
    return (i & (-i));
}

void add(int poz, int val) {
    for (int i = poz; i<=n; i+=ub(i)) {
        aib[i] += val;
    }
}

int sum(int poz) {
    int s = 0;
    for (int i = poz; i>=1; i -= ub(i)) {
        s += aib[i];
    }
    return s;
}

int main() {
    
    fin >> n >> m;
    for (int i = 1; i<=n; i++) {
        fin >> v[i];
        add(i, v[i]);
    }
    
    for (int i = 1; i<=m; i++) {
        fin >> op;
        if (op == 0) {
            fin >> x >> y;
            add(x, y);
        } else if (op == 1) {
            fin >> x >> y;
            fout << sum(y) - sum(x-1) << "\n";
        } else {
            fin >> x;
            int pozmin = n+1;
            int st = 1, dr = n;
            while (st <= dr) {
                int mid = (st+dr)/2;
                int S = sum(mid);
                if (S == x) {
                    pozmin = min(pozmin, mid);
                    dr = mid-1;
                } else if (S < x) {
                    st = mid+1;
                } else {
                    dr = mid-1;
                }
            }
            if (pozmin < n+1) {
                fout << pozmin << "\n";
            } else {
                fout << "-1\n";
            }
        }
    }
    
    return 0;
}