#include<cstdio>
using namespace std;
int aib[100001];
int n;
void aduna(int ind, int val)
{
	int poz=1;
	while(ind<=n)
	{
		aib[ind]+=val;
		while(!(ind&poz))
			poz<<=1;
		ind+=poz;
	}
}
int suma(int ind)
{
	int sum=0;
	int poz=1;
	while(ind>0)
	{
		sum+=aib[ind];
		while(!(ind&poz))
			poz<<=1;
		ind-=poz;
	}
	return sum;
}
int pozsum(int x)
{
	int st=1,dr=n,mij,sum;
	while(st<=dr)
	{
		mij=(st+dr)/2;
		sum=suma(mij);
		if(sum==x)
			return mij;
		if(sum>x)
			dr=mij-1;
		else
			st=mij+1;
	}
	return -1;
}
int main()
{
	int m;
	int i;
	int x;
	int ind;
	freopen("aib.in","r",stdin);
	freopen("aib.out","w",stdout);
	scanf("%d %d\n",&n,&m);
	for(i=1;i<=n;i++)
	{
		scanf("%d ",&x);
		aduna(i,x);
	}
	for(i=1;i<=m;i++)
	{
		scanf("%d ",&x);
		if(x==0)
		{
			scanf("%d %d\n",&ind,&x);
			aduna(ind,x);
		}
		else
		{
			if(x==1)
			{
				scanf("%d %d\n",&ind,&x);
				printf("%d\n",suma(x)-suma(ind-1));
			}
			else
			{
				scanf("%d\n",&x);
				printf("%d\n",pozsum(x));
			}
		}
	}
	fclose(stdin);
	fclose(stdout);
	return 0;
}