# Facebook Interview Questions

## Coding Interview 1

### Problem 1
Given alphabet [c b a]
sort the array in alphabetical order
[[a b b][a b c][c][b]] -> [[c][b][a b c][a b b]]


### Problem 2
Given a tree, calculate sum of all path sums

```
        4
       / \
      9   0
     / \
    5   1
```
495+491+40

This one I remember vaguely.

## Coding Interview 2

### Problem 1
How many unbalance parentheses are the in a given string.

e.g. )(())(() -> 2

### Problem 2

Given m sorted arrays, return k-th element from joined sorted array.