interview questions facebook/google

puzzles/interviews/Facebook Interview Questions.md

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+# 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.