#include <iostream>
#include <random>
#include <fstream>
#include <bitset>

using namespace std;

ifstream fin("aib.in");
ofstream fout("aib.out");
int aib[100005];
int n,q;
void update(int pos, int val) {
    for (; pos<=n; pos+=(pos&-pos))
        aib[pos]+=val;
}
int sum(int pos) {
    int s=0;
    for (; pos>=1; pos-=(pos&-pos))
        s+=aib[pos];
    return s;
}
int cb(int val) {
    int st=1,dr=n;
    int sol=-1;
    while (st<=dr) {
        int mij=(st+dr)/2;
        if (sum(mij)==val)
            sol=mij,dr=mij-1;
        else if (sum(mij)>val)
            dr=mij-1;
        else
            st=mij+1;
    }
    return sol;
}
int main() {
    fin>>n>>q;
    for (int i=1; i<=n; i++) {
        int x;
        fin>>x;
        update(i,x);
    }
    while (q--) {
        int tip;
        fin>>tip;
        if (tip==0) {
            int x,y;
            fin>>x>>y;
            update(x,y);
        }
        else if (tip==1) {
            int x,y;
            fin>>x>>y;
            fout<<sum(y)-sum(x-1)<<"\n";
        }
        else {
            int x;
            fin>>x;
            fout<<cb(x)<<"\n";
        }
    }

    return 0;
}