Submission #1687941

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Source Code Expand

import java.util.*;

class Main{

   public static void main(String[] args){

       Scanner sc = new Scanner(System.in);
      
       int N = sc.nextInt();       
       int M = sc.nextInt();
       
       int X = sc.nextInt();
       int Y = sc.nextInt();
       
       int a[] = new int[N];
       int b[] = new int[M];
       
       for(int i = 0;i < N;i++){
          a[i] = sc.nextInt();
       }
       
       for(int i = 0;i < M;i++){
           b[i] = sc.nextInt();           
       }
       
       int time = 0;
       int aindex = 0;
       int bindex = 0;
       
       boolean aflag = false;
       boolean bflag = false;
       
       int ans = 0;
       
       while(true){
           time = a[aindex] + X;
           bindex = lower_bound(b,time);
           
           if(bindex >= M){
               break;
           }
           
           time = b[bindex] + Y;
           
           aindex = lower_bound(a,time);
           
           ans++;
           
           if(aindex >= N){
               break;
           }
           
       }
       
       System.out.println(ans);
   }   

   static int lower_bound(int a[],int time){
       
       int l = -1;
       int r = a.length;
       
       while(r - l > 1){
           int mid = (l+r)/2;
           
           if(a[mid] >= time){
               r = mid;
           }else{
               l = mid;
           }                      
       }
       
       return l+1;
       
       
   }

}
        

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