#include <fstream>

using namespace std;

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

int n, m;
int arb[100005];

void adauga(int poz, int x){
    while (poz <= n){
        arb[poz] += x;
        poz += (poz ^ (poz-1)) & poz;
    }
}

int suma(int poz){
    int s = 0;
    while (poz > 0){
        s += arb[poz];
        poz -= (poz ^ (poz-1)) & poz;
    }
    return s;
}

int caut(int x){
    int k = 1, i;
    while (k < n)
        k *= 2;

    i = 0;
    while (k > 0){
        if (i + k <= n){
            if (suma(i+k) == x)
                return i+k;
            else if (suma(i+k) < x)
                i += k;
        }
        k /= 2;
    }
    return -1;
}

void citire(){
    int x, i, a, b, tip;
    f >> n >> m;
    for (i = 1; i <= n; i++){
        f >> x;
        adauga(i, x);
    }

    while (m > 0){
        f >> tip;
        if (tip < 2){
            f >> a >> b;
            if (tip == 0)
                adauga(a, b);
            else
                g << suma(b) - suma(a-1) << '\n';
        }
        else{
            f >> a;
            g << caut(a) << '\n';
        }
        m--;
    }
}

int main(){
    citire();
    return 0;
}