feat(leetcode): add No.1688

Author: mickey0524

1688.Count-of-Matches-in-Tournament.java

@@ -0,0 +1,22 @@
+// https://leetcode.com/problems/count-of-matches-in-tournament/
+// algorithms
+// Easy (83.94%)
+// Total Accepted: 5,565
+// Total Submissions: 6,630
+
+
+class Solution {
+    public int numberOfMatches(int n) {
+        int res = 0;
+        
+        while (n > 1) {
+            int tmp = n / 2;
+            
+            
+            res += tmp;
+            n -= tmp;
+        }
+        
+        return res;
+    }
+}