Remove Element

Remove Element

Given an array and a value, remove all instances of that value in place and return the new length.

The order of elements can be changed. It doesn't matter what you leave beyond the new length.

public class Solution {
    public int removeElement(int[] A, int elem) {
            int B[] = new int[A.length];
            int length = 0 ;
            
            for(int i = 0; i < A.length;i++){
                if(elem == A[i]){
                    continue;
                }
                B[length++] = A[i];
            }
            System.arraycopy(B, 0, A, 0, B.length);
            return length;
            
        }
}

 discuss中的

class Solution {
public:
    int removeElement(int A[], int n, int elem) {
        int index = 0;
        int tail = n - 1;

        while(index <= tail){
            if(A[index] == elem){
                A[index] = A[tail];
                tail -= 1;
            }else{
                index++;
            }     
        }

        return tail + 1;
    }
};