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diff --git a/‎May-LeetCoding-Challenge/First-Bad-Version/First-Bad-Version.java
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+18Lines changed: 18 additions & 0 deletions b/‎May-LeetCoding-Challenge/First-Bad-Version/First-Bad-Version.java
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+18Lines changed: 18 additions & 0 deletions
@@ -0,0 +1,18 @@
+/* The isBadVersion API is defined in the parent class VersionControl.
+      boolean isBadVersion(int version); */
+
+public class Solution extends VersionControl {
+    public int firstBadVersion(int n) {
+        int start = 1, end = n;
+        int mid = start + (end - start) / 2;
+        while (start < end) {
+            if (isBadVersion(mid)) {
+                end = mid;
+            } else {
+                start = mid + 1;
+            }
+            mid = start + (end - start) / 2;
+        }
+        return mid;
+    }
+}