README.md

118. Pascals Triangle

Problem Statement

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 as shown:

 

Example 1:

Input: numRows = 5
Output: [[1],[1,1],[1,2,1],[1,3,3,1],[1,4,6,4,1]]

Example 2:

Input: numRows = 1
Output: [[1]]

 

Constraints:

• 1 <= numRows <= 30

Solutions

Go

package main

func generate(numRows int) [][]int {
	pascal := make([][]int, numRows)
	for i := 0; i < numRows; i++ {
		row := make([]int, i+1)
		row[0] = 1
		row[i] = 1
		for j := 1; j < i; j++ {
			row[j] = pascal[i-1][j-1] + pascal[i-1][j]
		}
		pascal[i] = row
	}

	return pascal
}

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