Language: C++

#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <set>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <cstdio>
#include <cstring>
#include <iterator>
#include <bitset>
#include <unordered_set>
#include <unordered_map>
#include <fstream>
#include <iomanip>
#include <cassert>
#include <utility>
#include <memory>
#include <functional>
#include <deque>
#include <cctype>
#include <ctime>
#include <numeric>
#include <list>
#include <iomanip>

#if __cplusplus >= 201103L
#include <array>
#include <tuple>
#include <initializer_list>
#include <forward_list>

#define cauto const auto&
#else

#endif

using namespace std;


typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vint;
typedef vector<vector<int> > vvint;
typedef vector<long long> vll, vLL;
typedef vector<vector<long long> > vvll, vvLL;

#define VV(T) vector<vector< T > >

template <class T>
void initvv(vector<vector<T> > &v, int a, int b, const T &t = T()){
    v.assign(a, vector<T>(b, t));
}

template <class F, class T>
void convert(const F &f, T &t){
    stringstream ss;
    ss << f;
    ss >> t;
}

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define reep(i,a,b) for(int i=(a);i<(b);++i)
#define rep(i,n) reep((i),0,(n))
#define ALL(v) (v).begin(),(v).end()
#define PB push_back
#define F first
#define S second
#define mkp make_pair
#define RALL(v) (v).rbegin(),(v).rend()
#define DEBUG
#ifdef DEBUG
#define dump(x)  cout << #x << " = " << (x) << endl;
#define debug(x) cout << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;
#else
#define dump(x) 
#define debug(x) 
#endif

#define MOD 1000000007LL
#define EPS 1e-8
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3fLL
#define maxs(x,y) x=max(x,y)
#define mins(x,y) x=min(x,y)

bool pre[5010][5010];
bool suf[5010][5010];

void mainmain(){
	int n;
	cin>>n;
	int K;
	cin>>K;
	vll v(n);
	rep(i,n) cin>>v[i];
	sort(ALL(v));
	int ans = 0;
	// int m = 100010;
	pre[0][0] = true;
	suf[n-1][0] = true;
	rep(i,n){
		if(i) rep(j,5010){
			pre[i][j] = pre[i-1][j];
		}
		if(v[i]>=K) continue;
		for(int j = K; j >= v[i]; j--){
			pre[i][j] |= pre[i][j-v[i]];
		}
	}
	for(int i = n-1; i>=0; i--){
		if(i!=n-1){
			rep(j,5010){
				suf[i][j] = suf[i+1][j];
			}
		}
		if(v[i]>=K) continue;
		for(int j = K; j >= v[i]; j--){
			suf[i][j] |= suf[i][j-v[i]];
		}
	}
	vvint aa(n);
	vvint bb(n);
	rep(i,n){
		rep(j,5010){
			if(pre[i][j]) aa[i].PB(j);
			if(suf[i][j]) bb[i].PB(j);
		}
	}
	if(i==1){
		if(v[0] >= K) cout<<0<<endl;
		else cout<<1<<endl;
		return;
	}
	rep(i,n){
		bool ok = false;
		if(i==0){
			for(cauto x: bb[i+1]){
				if(x>=K) break;
				if(x + v[i] >= K) ok = true;
			}
		}
		else if(i==n-1){
			for(cauto x: aa[i-1]){
				if(x>=K) break;
				if(x + v[i] >= K) ok = true;
			}
		}
		else{
			for(cauto x: aa[i-1]){
				// cout<<i<<" "<<x<<endl;
				if(K-x-v[i]<0) continue;
				auto it = lower_bound(ALL(bb[i+1]), K-x-v[i]);
				if(it==bb[i+1].end()) continue;
				// cout<< *it << endl;
				if(*it + x < K){
					ok=true;
					// cout<<"hh "<<i<<" "<< *it << x << endl;
				}
			}
		}
		if(v[i] >= K) ok=true;
		if(!ok){
			ans++;
			// cout<<i<<" "<<v[i]<<endl;
		}
	}
	cout<<ans<<endl;
}


signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout<<fixed<<setprecision(20);
    mainmain();
}

Compiler output:
a.cc: In function 'void mainmain()':
a.cc:140:12: error: 'i' was not declared in this scope
  140 |         if(i==1){
      |            ^