## Google Interview Question

Software Engineers**Country:**United States

**Interview Type:**In-Person

```
void LongestSubSequence(int arr[], int arr2[],int n1,int n2)
{
map<int, int> mapMerged = { make_pair(0,0) };
map<int, int>::iterator mapIt;
int largest = (n1 > n2) ? n1 : n2;
for (int i = 0; i < largest; i++)
{
if (i < n1)
{
mapMerged[arr[i]]++;
}
if (i < n2)
{
mapMerged[arr2[i]]++;
}
}
//Print sequence now.
for (mapIt = mapMerged.begin(); mapIt != mapMerged.end(); mapIt++)
{
if(mapIt->second > 1)
printf("%d ",mapIt->first);
}
}
int main()
{
int arr1[] = {1,5,2,6,3,7,9,10,55,34};
int arr2[] = { 5,6,7,1,2,3,10 };
int n1 = sizeof(arr1) / sizeof(int);
int n2 = sizeof(arr2) / sizeof(int);
LongestSubSequence(arr1,arr2,n1,n2);
}
```

C#

Cost: O(m + n)

```
private static List<int> lcs(int[] array1, int[] array2)
{
List<int> r1 = lcsInternal(array1, array2);
List<int> r2 = lcsInternal(array2, array1);
List<int> result;
// Get the longest
if (r1.Count >= r2.Count) { result = r1; }
else { result = r2; }
return result;
}
private static List<int> lcsInternal(int[] array1, int[] array2)
{
int l1 = array1.Length;
int l2 = array2.Length;
List<int> resultList = new List<int>();
// Initially start with 0
int startj = 0;
bool done = false;
for (int i = 0; i < l1 && !done; i++)
{
int v1 = array1[i];
for (int j = startj; j < l2; j++)
{
int v2 = array2[j];
// Not the same value, go to the next j
if (v1 != v2) { continue; }
// v1 == v2
// Store the result
resultList.Add(v1);
// Store the current j + 1 because it'll start there on
// the next iteration
startj = j + 1;
if (startj >= l2)
{
done = true;
}
// Stop the current j, and continue with i
break;
}
}
return resultList;
}
```

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