LeetCode 2657: Find the Prefix Common Array of Two Arrays Solution
Master LeetCode problem 2657 (Find the Prefix Common Array of Two Arrays), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
2657. Find the Prefix Common Array of Two Arrays
Problem Explanation
Explanation:
To find the prefix common array of two arrays A and B, we iterate through both arrays simultaneously and count the numbers that are common up to the current index. We keep track of the count in a separate array C.
- Initialize an array C of size n with all elements as 0.
- Iterate through arrays A and B simultaneously.
- For each index i, count the common elements up to index i in arrays A and B.
- Update the count in array C at index i.
- Return the array C as the prefix common array.
Time complexity: O(n) where n is the length of the input arrays A and B. Space complexity: O(n) for the output array C.
Solution Code
class Solution {
public int[] prefixCommonArray(int[] A, int[] B) {
int n = A.length;
int[] C = new int[n];
for (int i = 0; i < n; i++) {
int count = 0;
for (int j = 0; j <= i; j++) {
if (contains(A, B, A[j])) {
count++;
}
}
C[i] = count;
}
return C;
}
private boolean contains(int[] A, int[] B, int num) {
for (int i = 0; i < A.length; i++) {
if (A[i] == num && B[i] == num) {
return true;
}
}
return false;
}
}Try It Yourself
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