374. Guess Number Higher or Lower

Author: SinnoLn

leetcode3/이진희/374. Guess Number Higher or Lower.java

@@ -0,0 +1,22 @@
+public class Solution extends GuessGame {
+    public int guessNumber(int n) {
+        int l = 1;
+        int r = n;
+
+        while (l <= r) {
+
+            int mid = l + (r - l) / 2;
+            int num = guess(mid);
+
+            if (num == -1) {
+                r = mid - 1;
+            } else if (num == 1) {
+                l = mid + 1;
+            } else {
+                return mid;
+            }
+        }
+
+        return -1;
+    }
+}