An array is subset of another array

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How can I efficiently check to see whether all the elements in an integer array are subset of all elements of another Array in java? For example [33 11 23] is subset of [11 23 33 42]. Thanks in advance.

Make a HashSet out of the superset array. Check if each of the elements of the subset array are contained in the HashSet. This is a very fast operation.

Find whether an array is subset of another array, Find whether an array is subset of another array using Map. Given two arrays: arr1[0..m-1] and arr2[0..n-1]. Find whether arr2[] is a subset of arr1[] or not. Both the  How to check whether an array is subset of another array using JavaScript ? Array with GCD of any of its subset belongs to the given array; Find original array from encrypted array (An array of sums of other elements) Find an element in array such that sum of left array is equal to sum of right array; Minimum product subset of an array

If you're not bound to using Arrays, any Java collection has the containsAll method:

boolean isSubset = bigList.containsAll(smallList);

This will do exactly what you want, efficiently.

Find whether an array is subset of another array using Map , ) For example. input : A[] = { 3, 5, 7, 12, 1, 9, 10, 0, 2 }, B[] = { 1, 3, 5, 9 } Make a HashSet out of the superset array. Check if each of the elements of the subset array are contained in the HashSet. This is a very fast operation. You don't pick the "larger" / "smaller" arrays. You pick them according to which is supposed to be the subset of the other. – Stephen C Mar 26 '13 at 3:27.

assume you want to check A is subset of B. put each element of B into a hash, then iterate over elements in A, all of them must exist in the hash

Find whether an array is a subset of another array, How do you check if an array contains another array in JavaScript? An array A is subset of another array B, if each element of A is present in B. Let Array1 and Array2 be two integer array of size M and N respectively and we want to check whether Array2 is subset of Array1 or not. Search each element of Array2 in Array1 using linear search.

The outer loop picks all the elements of arr2[] one by one. The inner loop linearly searches for the element picked by outer loop. If all elements are found then return true, else return false.

boolean checkIsSubset(int arr1[], int arr2[]){

    int m=arr1.length,  n=arr2.length;
    int i = 0;
    int j = 0;
    for (i=0; i<n; i++){
        for (j = 0; j<m; j++){
           if(arr2[i] == arr1[j])
              break;
        }
        if (j == m)
           return false;
    }
    return true;
}

Why do binary search after sorting?? Since both arrays will be available in sorted form, we can just use two pointers as follows:-

boolean isSubset(int arr1[], int arr2[], int m, int n){

int i = 0, j = 0;
quickSort(arr1, 0, m-1);
quickSort(arr2, 0, n-1);
while( i < n && j < m )
{
    if( arr1[j] <arr2[i] )
        j++;
    else if( arr1[j] == arr2[i] )
    {
        j++;
        i++;
    }
    else if( arr1[j] > arr2[i] )
        return false;
}

if( i < n )
    return false;
else
    return true;

}

How to find if two arrays contain any common item in Javascript , How do you check if a list is subset of another list? Given two arrays: arr1[0..m-1] and arr2[0..n-1]. Find whether arr2[] is a subset of arr1[] or not. Both the arrays are not in sorted order. It may be assumed that elements in both array are distinct.

Python, How do you implement two stacks in a single array? C Array: Exercise-55 with Solution. Write a program in C to check whether an array is subset of another array. Pictorial Presentation: Sample Solution:

Implement two stacks in an array, Given two integer array A[] and B[] of size m and n(n <= m) respectively. We have to check whether B[] is a subset of A[] or not. An array B is a subset of another  Here in this section we will learn a Java program to determine the array is a subset of another array or not and we will also learn about it's algorithm.

An array is subset of another array, Make a HashSet out of the superset array. Check if each of the elements of the subset array are contained in the HashSet . This is a very fast  Sort an array where a subarray of a sorted array is in reverse order; Check whether an array can be fit into another array rearranging the elements in the array; Check if it is possible to make array increasing or decreasing by rotating the array; Check if there exist two elements in an array whose sum is equal to the sum of rest of the array

Find whether an array is subset of another array, Find Complete Code at GeeksforGeeks Article: https://www.geeksforgeeks.org/​find-whether-an Duration: 5:53 Posted: Sep 11, 2019 c# - two - how to check if an array contains another array Check whether an array is a subset of another (6) Here we check that if there is any element present in the child list (i.e t2) which is not contained by the parent list (i.e t1).If none such exists then the list is subset of the other

Comments
  • You don't pick the "larger" / "smaller" arrays. You pick them according to which is supposed to be the subset of the other.
  • @Stephen C Fixed terminology