updated readme

2017-04-30 18:30:26 -07:00
parent 9b6ef0f13b
commit 7145449310
57 changed files with 287 additions and 268 deletions
@@ -0,0 +1,31 @@
+//     Author: Rodney Shaghoulian
+//     Github: github.com/rshaghoulian
+// HackerRank: hackerrank.com/rshaghoulian
+
+import java.util.Scanner;
+import java.util.HashSet;
+
+public class Solution {
+    public static void main(String[] args) {     
+        /* Read some input */
+        Scanner scan = new Scanner(System.in);
+        int n = scan .nextInt();
+        
+        /* Count pairs */
+        HashSet<Integer> set = new HashSet<>();
+        int pairs = 0;
+        for (int i = 0; i < n; i++) {
+            int cost = scan.nextInt();
+            if (set.contains(cost)) {
+                set.remove(cost);
+                pairs++;
+            } else {
+                set.add(cost);
+            }
+        }
+
+        /* Print output */
+        scan.close();
+        System.out.println(pairs);
+    }
+}