Pascal's Triangle

Given numRows, generate the first numRows of Pascal's triangle.

For example, given numRows = 5,
Return

[
     [1],
    [1,1],
   [1,2,1],
  [1,3,3,1],
 [1,4,6,4,1]
]
Implement strStr().

Implement strStr().

Returns the index of the first occurrence of needle in haystack, or -1
if needle is not part of haystack.

Update (2014-11-02):
The signature of the function had been updated to return the index
instead of the pointer. If you still see your function signature
returns a char * or String, please click the reload button  to reset
your code definition.