DecreasingScoresRanks

DecreasingScores/DecreasingScore.java

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+
+/* DecreasingScore
+
+   * Comparators are used to compare two objects. In this challenge, you'll create
+   * a comparator and use it to sort an array.
+   * 
+   * The Player class is provided for you in your editor. It has
+   * fields: a String and a
+   * 
+   * integer.
+   * 
+   * Given an array of
+   * Player objects, write a comparator that sorts them in order of decreasing
+   * score; if
+   * 
+   * or more players have the same score, sort those players alphabetically by
+   * name. To do this, you must create a Checker class that implements the
+   * Comparator interface, then write an int compare(Player a, Player b) method
+   * implementing the Comparator.compare(T o1, T o2) method.
+   * 
+   * Input Format
+   * 
+   * Input from stdin is handled by the locked stub code in the Solution class.
+   * 
+   * The first line contains an integer,
+   * , denoting the number of players.
+   * Each of the subsequent lines contains a player's and
+   * 
+   * , respectively.
+   * 
+   * Constraints
+   * 
+   * players can have the same name.
+   * Player names consist of lowercase English letters.
+   * 
+   * Output Format
+   * 
+   * You are not responsible for printing any output to stdout. The locked stub
+   * code in Solution will create a Checker object, use it to sort the Player
+   * array, and print each sorted element.
+   * 
+   * Sample Input
+   * 
+   * 5
+   * amy 100
+   * david 100
+   * heraldo 50
+   * aakansha 75
+   * aleksa 150
+   * 
+   * Sample Output
+   * 
+   * aleksa 150
+   * amy 100
+   * david 100
+   * aakansha 75
+   * heraldo 50
+ */
+import java.util.*;
+
+// Write your Checker class here
+class Checker implements Comparator<Player> {
+
+  @Override
+  public int compare(Player p1, Player p2) {
+    if (p1.score == p2.score) {
+      return p1.name.compareTo(p2.name);
+    }
+    return p2.score - p1.score;
+  }
+}
+
+class Player {
+  String name;
+  int score;
+
+  Player(String name, int score) {
+    this.name = name;
+    this.score = score;
+  }
+}
+
+public class DecreasingScore {
+  public static void main(String[] args) {
+    Scanner scan = new Scanner(System.in);
+    int n = scan.nextInt();
+
+    Player[] player = new Player[n];
+    Checker checker = new Checker();
+
+    for (int i = 0; i < n; i++) {
+      player[i] = new Player(scan.next(), scan.nextInt());
+    }
+    scan.close();
+
+    Arrays.sort(player, checker);
+    for (int i = 0; i < player.length; i++) {
+      System.out.printf("%s %s\n", player[i].name, player[i].score);
+    }
+  }
+}