q10

gistfile3.js

import java.util.*;

class Solution {
    /**
     * @param clusterSize The cluster size of a disk (in bytes).
     * @param fileSize The size of a file (in bytes).
     * @return The "size on disk" of this file, on this disk (in bytes).
     */
    public static int computeSizeOnDisk(int clusterSize, int fileSize) {
        // Calculate the number of clusters needed.
        // Using integer division, (fileSize + clusterSize - 1) / clusterSize
        // correctly calculates the ceiling of fileSize / clusterSize for non-negative fileSize.
        int numberOfClusters = (fileSize + clusterSize - 1) / clusterSize;

        // The size on disk is the number of clusters multiplied by the cluster size.
        int sizeOnDisk = numberOfClusters * clusterSize;

        return sizeOnDisk;
    }
}