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# Find common elements in three sorted arrays in C++

Suppose we have three arrays with some elements. We have to find all the common elements that are present in these three arrays. Suppose these elements are [10, 12, 15, 20, 25], [10, 12, 13, 15] and [10, 12, 15, 24, 25, 26], then the common elements in these three arrays are 10, 12 and 15.

Suppose current element traversed in array A1 be x, A2 be y and A3 be z. We can have the following cases for them −

If x, y, and z are same, then we will print any of them, and increase each array elements by 1

When x < y, then we will move ahead in A1 as x cannot be a common element

When x > z and y > z, then we will move ahead for A3, as z cannot be a common element.

## Example

#include<iostream> using namespace std; void findCommonValues(int A1[], int A2[], int A3[], int n1, int n2, int n3) { int i = 0, j = 0, k = 0; while (i < n1 && j < n2 && k < n3) { if (A1[i] == A2[j] && A2[j] == A3[k]) { cout << A1[i] << " "; i++; j++; k++; } else if (A1[i] < A2[j]) i++; else if (A2[j] < A3[k]) j++; else k++; } } int main() { int A1[] = {10, 12, 15, 20, 25}; int n1 = sizeof(A1)/sizeof(A1[0]); int A2[] = {10, 12, 13, 15}; int n2 = sizeof(A2)/sizeof(A2[0]); int A3[] = {10, 12, 15, 24, 25, 26}; int n3 = sizeof(A3)/sizeof(A3[0]); cout << "Common elements are: "; findCommonValues(A1, A2, A3, n1, n2, n3); }

## Output

Common elements are: 10 12 15

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