#include <bits/stdc++.h>
#define NMAX 100000
#define int long long
using namespace std;
int v[NMAX + 5];
int n;
void update( int i, int val ){
    while( i <= n ){
        v[i] += val;
        i += ( i & -i );
    }
}
int prefixSum( int i ){
    int sum = 0;
    while( i > 0 ){
        sum += v[i];
        i -= ( i & -i );
    }
    return sum;
}
int rangeSum( int i, int j ){
    return prefixSum( j ) - prefixSum( i - 1 );
}
signed main()
{
    ifstream fin( "aib.in" );
    ofstream fout( "aib.out" );
    int m, i, op, a, b, rasp, mij, st, dr;
    fin >> n >> m;
    for( i = 1; i <= n; i++ ){
        fin >>a;    update(i,a);
    }
    for( i = 1; i <= m; i++ ){
        fin >> op >> a;
        if( op == 0 ){
            fin >> b;
            update( a, b );
        }else if( op == 1 ){
            fin >> b;
            fout << rangeSum( a, b ) << "\n";
        }else{
            st = 1;
            dr =rasp= n;
            while( st <= dr ){
                mij = ( st + dr ) / 2;
                if( prefixSum( mij ) < a )
                    st = mij+1;
                else if(prefixSum(mij)>=a)
                {
                    rasp=mij;
                    dr=mij-1;
                }
            }
            if(prefixSum(rasp)!=a) fout<<"-1\n";
            else fout<<rasp<<"\n";
        }
    }
    return 0;
}