SubarrayDivision.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

public class SubarrayDivision {

    // Complete the birthday function below.
    static int birthday(List<Integer> s, int d, int m) {
        if(s.size() < m){
           return 0;
        }
        int counter = 0, sum = 0;
        for(int i=0;i<=s.size()-m;i++){
          for(int j=i;j<i+m;j++){
             sum += s.get(j);
          }
          if(sum == d){
             counter++;
          }  
          sum = 0; 
        }
        return counter;

    }

    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int n = Integer.parseInt(bufferedReader.readLine().trim());

        List<Integer> s = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
            .map(Integer::parseInt)
            .collect(toList());

        String[] dm = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");

        int d = Integer.parseInt(dm[0]);

        int m = Integer.parseInt(dm[1]);

        int result = birthday(s, d, m);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}