Package g2601_2700.s2657_find_the_prefix_common_array_of_two_arrays

Class Solution

java.lang.Object
g2601_2700.s2657_find_the_prefix_common_array_of_two_arrays.Solution
public class Solution extends java.lang.Object
2657 - Find the Prefix Common Array of Two Arrays.

Medium

You are given two 0-indexed integer permutations A and B of length n.

A prefix common array of A and B is an array C such that C[i] is equal to the count of numbers that are present at or before the index i in both A and B.

Return the prefix common array of A and B.

A sequence of n integers is called a permutation if it contains all integers from 1 to n exactly once.

Example 1:

Input: A = [1,3,2,4], B = [3,1,2,4]

Output: [0,2,3,4]

Explanation: At i = 0: no number is common, so C[0] = 0.

At i = 1: 1 and 3 are common in A and B, so C[1] = 2.

At i = 2: 1, 2, and 3 are common in A and B, so C[2] = 3.

At i = 3: 1, 2, 3, and 4 are common in A and B, so C[3] = 4.

Example 2:

Input: A = [2,3,1], B = [3,1,2]

Output: [0,1,3]

Explanation: At i = 0: no number is common, so C[0] = 0.

At i = 1: only 3 is common in A and B, so C[1] = 1.

At i = 2: 1, 2, and 3 are common in A and B, so C[2] = 3.

Constraints:

  • 1 <= A.length == B.length == n <= 50
  • 1 <= A[i], B[i] <= n
  • It is guaranteed that A and B are both a permutation of n integers.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int[]
    findThePrefixCommonArray(int[] a, int[] b)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • findThePrefixCommonArray

      public int[] findThePrefixCommonArray(int[] a, int[] b)