105. Pascal's Triangle

EasyDynamic Programming

Given an integer numRows, return the first numRows of Pascal's triangle. In Pascal's triangle, each number is the sum of the two numbers directly above it.

Examples

Input: 5

Output: [[1],[1,1],[1,2,1],[1,3,3,1],[1,4,6,4,1]]

Explanation: The first 5 rows of Pascal's triangle.

Constraints

  • 1 <= numRows <= 30
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