|543|[Diameter of Binary Tree](https://leetcode.com/problems/diameter-of-binary-tree/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_543.java) | O(n) |O(h) | Easy | Tree/DFS/Recursion

|542|[01 Matrix](https://leetcode.com/problems/01-matrix/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_542.java) | O(m*n) |O(n) | Medium | BFS

|541|[Reverse String II](https://leetcode.com/problems/reverse-string-ii/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_541.java) | O(n) |O(1) | Easy | String

|540|[Single Element in a Sorted Array](https://leetcode.com/problems/single-element-in-a-sorted-array/)|[Solution](../master/src/main/java/com/fishercoder/solutions/SingleElementinaSortedArray.java)| O(n)|O(1)| Medium|

|540|[Single Element in a Sorted Array](https://leetcode.com/problems/single-element-in-a-sorted-array/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_540.java)| O(n)|O(1)| Medium|

|539|[Minimum Time Difference](https://leetcode.com/problems/minimum-time-difference/)|[Solution](../master/src/main/java/com/fishercoder/solutions/MinimumTimeDifference.java) | O(n) |O(1) | Medium | String

|538|[Convert BST to Greater Tree](https://leetcode.com/problems/convert-bst-to-greater-tree/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_538.java) | O(nlogn) |O(n) | Medium | Tree

|537|[Complex Number Multiplication](https://leetcode.com/problems/complex-number-multiplication/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_537.java) | O(1) |O(1) | Medium | Math, String

publicclassSingleElementinaSortedArray {

publicclass_540 {

publicintsingleNonDuplicate(int[]nums) {

intresult =0;

packagecom.fishercoder;

importcom.fishercoder.solutions.SingleElementinaSortedArray;

importcom.fishercoder.solutions._540;

importorg.junit.Before;

importorg.junit.BeforeClass;

importorg.junit.Test;

importstaticjunit.framework.Assert.assertEquals;

publicclassSingleElementinaSortedArrayTest {

privatestaticSingleElementinaSortedArraytest;

publicclass_540Test {

privatestatic_540test;

privatestaticintexpected;

privatestaticintactual;

privatestaticint[]nums;

publicstaticvoidsetup(){

test =newSingleElementinaSortedArray();

test =new_540();

}