K-th Largest Value

题目：
You are given an array a consisting of n integers. Initially all elements of a are either 0 or 1. You need to process q queries of two kinds:

1 x : Assign to ax the value 1−ax.
2 k : Print the k-th largest value of the array.
As a reminder, k-th largest value of the array b is defined as following:

Sort the array in the non-increasing order, return k-th element from it.
For example, the second largest element in array [0,1,0,1] is 1, as after sorting in non-increasing order it becomes [1,1,0,0], and the second element in this array is equal to 1.

Input
The first line contains two integers n and q (1≤n,q≤105) — the length of the given array and the number of queries.

The second line contains n integers a1,a2,a3,…,an (0≤ai≤1) — elements of the initial array.

Each of the following q lines contains two integers. The first integer is t (1≤t≤2) — the type of query.

If t=1 the second integer is x (1≤x≤n) — the position of the modified number. You have to assign to ax the value 1−ax.
If t=2 the second integer is k (1≤k≤n) — you need to print the k-th largest value of the array.
It’s guaranteed that there will be at least one query of the second type (satisfying t=2).

Output
For each query of the second type, print a single integer — the answer to the query.

Example
inputCopy
5 5
1 1 0 1 0
2 3
1 2
2 3
2 1
2 5
outputCopy
1
0
1
0
Note
Initially a=[1,1,0,1,0].

The first operation is printing the third largest value, which is 1.

The second operation is assigning a2 the value 0, a becomes [1,0,0,1,0].

The third operation is printing the third largest value, it is 0.

The fourth operation is printing the first largest value, it is 1.

The last operation is printing the fifth largest value, it is 0.
题解：

#include <bits/stdc++.h>
using namespace std;
int a[1000005];
int main()
{
  int n,q;
  cin>>n>>q;
  int con=0;
  for(int i=1;i<=n;i++)
  {
    scanf("%d",&a[i]);
    if(a[i]==1) con++;
  }
  while(q--)
  {
    int t,x;
    cin>>t>>x;
    if(t==1) 
    {
      a[x]=1-a[x];
      if(a[x]==0) con--;
      else con++;
    }
    else 
    {
      if(x>con) cout<<"0"<<endl;
      else cout<<"1"<<endl;
    }
  }
  return 0;
}