Update H-Index II

Author: HarryWangATX

H-Index II

@@ -1,25 +1,20 @@
 class Solution {
     public int hIndex(int[] citations) {
-        int lo = 0;
-		int hi = citations.length - 1;
-		int length = citations.length - 1;
-		int hIndex = 0;
-		while(lo <= hi) {
-			int mid = lo + (hi - lo)/2;
-			int h = citations[mid];
-			int rightL = (length - mid) + 1;
-
-			if(h == rightL) {
-				hIndex = Math.max(hIndex, rightL);
-				break;
-			} else if(h < rightL) {
-				lo = mid + 1;
-			} else {
-				hIndex = Math.max(hIndex, rightL);
-				hi = mid - 1;
-			}
-		}
-
-		return hIndex;
-    }
+        int L=0;
+        int R=citations.length;
+        while (L<R){
+            int mid = (R+L)/2;
+            int number = citations.length - mid;
+            if(number == citations[mid]){
+                return number;
+            }
+            if(number < citations[mid]){ 
+                R = mid;
+            }
+            else{
+                L = mid+1;
+            }
+        }
+        return citations.length - L;
+    }   
 }