diff --git a/src/main/java/UnitTest/TestC.java b/src/main/java/UnitTest/TestC.java
index 268f2f7..c28cd63 100644
--- a/src/main/java/UnitTest/TestC.java
+++ b/src/main/java/UnitTest/TestC.java
@@ -6,47 +6,47 @@ import java.util.Arrays;
 
 public class TestC {
 
-    public static String[] sortByName(String[] names, int[] heights) {
-        quickSort(names, heights, 0, heights.length - 1);
-        return names;
-    }
-
-    private static void quickSort(String[] names, int[] heights, int start, int end) {
-        if (start >= end) {
-            return;
+    public static int maxSumTwoNoOverlap(int[] nums, int firstLen, int secondLen) {
+        int n = nums.length;
+        int[] prefixSum = new int[n + 1];
+        for (int i = 1; i <= n; i++) {
+            prefixSum[i] = prefixSum[i - 1] + nums[i - 1];
         }
-        int pivot = partition(names, heights, start, end);
-        quickSort(names, heights, start, pivot - 1);
-        quickSort(names, heights, pivot + 1, end);
-    }
-
-    private static int partition(String[] names, int[] heights, int start, int end) {
-        int pivotHeight = heights[end];
-        int i = start - 1;
-        for (int j = start; j < end; j++) {
-            if (heights[j] >= pivotHeight) {
-                i++;
-                int tmpHeight = heights[i];
-                heights[i] = heights[j];
-                heights[j] = tmpHeight;
-                String tmpName = names[i];
-                names[i] = names[j];
-                names[j] = tmpName;
+        int maxSum = 0;
+        int[] maxSumLeft = new int[n];
+        int[] maxSumRight = new int[n];
+        int maxLeft = 0, maxRight = 0;
+        for (int i = firstLen - 1; i <= n - secondLen; i++) {
+            int sum = prefixSum[i + 1] - prefixSum[i - firstLen + 1];
+            if (sum > maxLeft) {
+                maxLeft = sum;
+            }
+            maxSumLeft[i] = maxLeft;
+        }
+        for (int i = n - secondLen; i >= firstLen - 1; i--) {
+            int sum = prefixSum[i + secondLen] - prefixSum[i];
+            if (sum >= maxRight) {
+                maxRight = sum;
             }
+            maxSumRight[i] = maxRight;
         }
-        int tmpHeight = heights[i + 1];
-        heights[i + 1] = heights[end];
-        heights[end] = tmpHeight;
-        String tmpName = names[i + 1];
-        names[i + 1] = names[end];
-        names[end] = tmpName;
-        return i + 1;
+        for (int i = firstLen - 1; i <= n - secondLen; i++) {
+            int sum = prefixSum[i + 1] - prefixSum[i - firstLen + 1];
+            maxSum = Math.max(maxSum, sum + maxSumRight[i + 1]);
+            maxSum = Math.max(maxSum, sum + maxSumLeft[i - 1]);
+        }
+        return maxSum;
     }
 
+
+
+
+
+
     public static void main(String[] args) {
-        String[] names = {"Mary", "John", "Emma"};
-        int[] heights = {180, 165, 170};
-        String[] sortedNames = sortByName(names, heights);
-        System.out.println(Arrays.toString(sortedNames));
+        int[] nums1 = { 0, 6, 5, 2, 2, 5, 1, 9, 4 };
+        int firstLen1 = 1;
+        int secondLen1 = 2;
+        System.out.println(maxSumTwoNoOverlap(nums1, firstLen1, secondLen1)); // expect 20
     }
 }