Array Manipulation Data Structures and Algorithm Cognizant Handson Solution

In this post we are going to cover the Data Structures & Algorithms Array Manipulation handson solution asked in Cognizant.

Question of this handson is available here.

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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;

class Result {

    /*
     * Complete the 'arrayManipulation' function below.
     *
     * The function is expected to return a LONG_INTEGER.
     * The function accepts following parameters:
     *  1. INTEGER n
     *  2. 2D_INTEGER_ARRAY queries
     */

    public static long arrayManipulation(int n, List<List<Integer>> queries) {
    // Write your code here
        long[] computation = new long[n];

        for (int i = 0; i < queries.size(); i++) {
            int a = queries.get(i).get(0) - 1;
            int b = queries.get(i).get(1) - 1;
            int k = queries.get(i).get(2);

            computation[a] += k;
            if (b + 1 < n ) {
                computation[b + 1] -= k;
            }
        }

        long max = 0; long sum = 0;
        for (int i = 0; i < n; i++) {
            sum += computation[i];
            max = Math.max(max, sum);
        }

        return max;

    }

}

public class Solution {
    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")));

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

        int n = Integer.parseInt(firstMultipleInput[0]);

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

        List<List<Integer>> queries = new ArrayList<>();

        IntStream.range(0, m).forEach(i -> {
            try {
                queries.add(
                    Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
                        .map(Integer::parseInt)
                        .collect(toList())
                );
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        });

        long result = Result.arrayManipulation(n, queries);

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

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