#include <cstdio>

#define lsb(i) (int)(i & -i)

const int MAX_N = 100001;

int n, m;
int aib[MAX_N];

void update(int poz, int val)
{
	for (; poz <= n; poz += lsb(poz))
		aib[poz] += val;
}

int query(int poz)
{
	int ret = 0;

	for (; poz; poz -= lsb(poz))
		ret += aib[poz];

	return ret;
}

int find(int val)
{
	if (val == 0)
		return -1;

	int pow = 1, i;

	for (; (pow << 1) <= n; pow <<= 1);

	for (i = 0; pow && val; pow >>= 1)
		if (i + pow <= n && aib[i + pow] <= val)
		{
			i += pow;
			val -= aib[i];
		}

	if (val)
		return -1;

	return i;
}

int main()
{
	int i;
	freopen("aib.in", "r", stdin);
	freopen("aib.out", "w", stdout);

	scanf("%d %d", &n, &m);

	for (i = 1; i <= n; ++i)
	{
		int x;

		scanf("%d", &x);

		aib[i] += x;

		if (i + lsb(i) <= n)
			aib[i + lsb(i)] += aib[i];
	}

	for (i = 1; i <= m; ++i)
	{
		int q, x, y;

		scanf("%d", &q);

		if (q == 0)
		{
			scanf("%d %d", &x, &y);

			update(x, y);
		}

		if (q == 1)
		{
			scanf("%d %d", &x, &y);

			printf("%d\n", query(y) - query(x - 1));
		}

		if (q == 2)
		{
			scanf("%d", &x);
			printf("%d\n", find(x));
		}
	}
}