C++ 代码
#include<bits/stdc++.h>
using namespace std;
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
int na,nb,k,m;
cin>>na>>nb>>k>>m;
vector<int> a(na,0),b(nb,0);
for (int i=0;i<na;++i ) cin>>a[i];
for (int i=0;i<nb;++i ) cin>>b[i];
cout<<(a[k-1]<b[nb-m] ? "YES":"NO")<<endl;
}