#include <fstream>

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

const int N_MAX = 1e5;
const int FENWICK_TREE_DIM_MAX = N_MAX + 1;
const int LOG_MAX = 16;

template<typename T>
class FenwickTree{
private:
		T bit[FENWICK_TREE_DIM_MAX]{};
		int bitSize;

		inline T leastSigmificantBit(int i){
			return i & (-i);
		}

public:
		void build(int n, ifstream& fin){
			bitSize = n;

			T x;
			for(int i = 1; i <= n; ++i){
				fin >> x;
				bit[i] += x;

				if(i + leastSigmificantBit(i) <= bitSize)
					bit[i + leastSigmificantBit(i)] += bit[i];
			}
		}

		void update(int pos, T val){
			while(pos <= bitSize){
				bit[pos] += val;
				pos += leastSigmificantBit(pos);
			}
		}

		T query(int pos){
			T sum = 0;

			while(pos > 0){
				sum += bit[pos];
				pos -= leastSigmificantBit(pos);
			}

			return sum;
		}

		T query(int x, int y){
			return query(y) - query(x - 1);
		}

		int find(T sum){
			int pos = 0;

			for(int e = LOG_MAX; e >= 0; --e)
				if(pos + (1 << e) <= bitSize && query(pos + (1 << e)) < sum)
					pos += 1 << e;

			if(pos + 1 <= bitSize && bit[pos + 1] == sum)
				++pos;
			else
				pos = -1;

			return pos;
		}
};

FenwickTree<int> bit;

int main(){
	int n, queries;
	fin >> n >> queries;

	bit.build(n, fin);

	int type, a, b;
	for(int i = 0; i < queries; ++i){
		fin >> type;
		if(type == 0){
			fin >> a >> b;
			bit.update(a, b);
		}else if(type == 1){
			fin >> a >> b;
			fout << bit.query(a, b) << '\n';
		}else{
			fin >> a;
			fout << bit.find(a) << '\n';
		}
	}

	fin.close();
	fout.close();
	return 0;
}