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27-remove-element/27-remove-element.c

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+int removeElement(int* nums, int numsSize, int val){
+    if (numsSize == 0) {
+        return 0;
+    }
+    
+    int backIndex = numsSize - 1;
+    for (int i = 0; i < backIndex; ++i) {
+        if (nums[i] == val) {
+            while (nums[backIndex] == val) {
+                backIndex--;
+                if (backIndex == i) {
+                    return nums[backIndex] == val ? backIndex : backIndex + 1;
+                }
+            }
+            nums[i] = nums[backIndex];
+            nums[backIndex] = val;
+            backIndex--;
+        }
+    }
+    return nums[backIndex] == val ? backIndex : backIndex + 1;
+}