#include <bits/stdc++.h>
#define zeros(x) ((x ^ (x - 1)) & x)

using namespace std;
ifstream f("aib.in");
ofstream g("aib.out");
int n, m;
int aib[100001];

void update(int pos, int val)
{
  for(int i = pos;i <= n;i += zeros(i))
    aib[i] += val;
}


int query(int pos)
{
  int sum = 0;
  for(int i = pos;i >= 1;i -= zeros(i))
    sum += aib[i];
  return sum;
}

int found(int sum)
{
  int rep = 1;
  for(;rep < n;rep <<= 1);
  for(int i = 0;rep;rep >>= 1)
    if(i + rep <= n && aib[i + rep] <= sum)
      {
        i += rep;
        sum -= aib[i];
        if(!sum)
          return i;
      }
  return -1;
}

void read()
{
  f>>n>>m;
  int x;
  for(int i = 1;i <= n;++i)
    f>>x, update(i, x);
}

void solve()
{
  int x, y, z;
  for(int i = 1;i <= m;++i)
    {
      f>>x>>y;
      if(!x)
        f>>z, update(y, z);
      else if(x == 1)
        f>>z, g<<query(z) - query(y - 1)<<'\n';
      else
        g<<found(y)<<'\n';
    }
}

int main()
{
  read();
  solve();
  return 0;
}