giúp em với code c++11 nhé

#include <bits/stdc++.h>

using namespace std;

#define ll long long
int main() {

freopen("XEPHANG.INP","r",stdin);

freopen("XEPHANG.OUT","w",stdout);

ll n, k;

cin >> n >> k;

vector<ll> a;

for(ll i = 0; i <n;i++) {

ll x;

cin >> x;

a.push_back(x);

}

a.push_back(INT_MAX);

sort(a.begin(),a.end());

ll pos = 0; for(ll i = 0; i <=n;i++) {

if(a[i] > k) {

pos = i+1;

break;

}

}

cout << pos << endl;

for(ll i = 0; i <pos-1;i++) {

cout << a[i] << " ";

}

cout << k << " ";

for(ll i = pos-1; i <n;i++) {

cout << a[i] << " ";

}   

return 0;

}