remove-element

Author: malipramod

easy/0027 remove-element/readme.md

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+# Remove Duplicates from Sorted Array
+
+Given an array nums and a value val, remove all instances of that value in-place and return the new length.
+
+Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.
+
+The order of elements can be changed. It doesn't matter what you leave beyond the new length.
+
+## Example 1
+
+Given nums = [3,2,2,3], val = 3,
+
+Your function should return length = 2, with the first two elements of nums being 2.
+
+It doesn't matter what you leave beyond the returned length.
+
+## Example 2
+
+Given nums = [0,1,2,2,3,0,4,2], val = 2,
+
+Your function should return length = 5, with the first five elements of nums containing 0, 1, 3, 0, and 4.
+
+Note that the order of those five elements can be arbitrary.
+
+It doesn't matter what values are set beyond the returned length.
+
+## Clarification
+
+Confused why the returned value is an integer but your answer is an array?
+
+Note that the input array is passed in by reference, which means modification to the input array will be known to the caller as well.
+
+Internally you can think of this:
+
+// nums is passed in by reference. (i.e., without making a copy)
+int len = removeDuplicates(nums);
+
+// any modification to nums in your function would be known by the caller.
+// using the length returned by your function, it prints the first len elements.
+for (int i = 0; i < len; i++) {
+    print(nums[i]);
+}
+
+## More info
+
+<https://leetcode.com/problems/remove-element/>

easy/0027 remove-element/remove-element.js

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+/**
+ * @param {number[]} nums
+ * @param {number} val
+ * @return {number}
+ */
+var removeElement = function(nums, val) {
+    let i=0;
+    for(let j=0;j<nums.length;j++){
+        if(nums[j]!=val){
+            nums[i] = nums[j];
+            i++;
+        }
+    }
+    return i;
+};
+
+var removeElement = function(nums, val) {
+    for(var i = nums.length - 1; i >= 0; i--){
+        if(nums[i] === val){
+            nums.splice(i, 1);
+        }
+    }
+    return nums.length
+};
+
+console.log(removeElement([0,1,2,2,3,0,4,2],2))