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Pascal's Triangle
Easy
Array
Dynamic Programming
Math

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]]
Input:1
Output:[[1]]

Constraints:

  • 1 ≤ numRows ≤ 30
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