#include <bits/stdc++.h>

using namespace std;
vector<int> bit, vetor_100pct_original;

void update_bit(int pos, int x){
	int pracsum = -vetor_100pct_original[pos-1];
	vetor_100pct_original[pos-1] = x;
	for(; pos <= bit.size(); pos += (pos&-pos)){
		bit[pos] += pracsum + x;
	}
}

int sumrange_bit(int pos){
	int answ = 0;
	for(; pos > 0; pos -= (pos&-pos)){
		answ += bit[pos];
	}
	return answ;
}

int main(){
	ios::sync_with_stdio(false);

	int n,q, x, t,k,p;
	cin >> n >> q;

	bit.assign(n+1,0);
	vetor_100pct_original.assign(n,0);
	for(int i = 1; i <= n; i++){
		cin >> x;
		bit[i] += x;
		vetor_100pct_original[i-1] = x;
		for(int j = i+(i&-i); j <= n; j += (j&-j)){
			bit[j] += x;
		}
	}

	while(q--){
		cin >> t >> k;
		if(t == 0){
			cin >> p;
			update_bit(k, p);
		}else{
			cout << sumrange_bit(k) << '\n';
		}
	}

	return 0;
}