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
/**
* @param {number} numRows
* @return {number[][]}
*/
var generate = function(numRows) {
const Arr = [[1]]
const setNextRow = (row) => {
const rowArr = Array(row.length + 1).fill(1)
for(let i = 1; i < rowArr.length - 1; i++) {
rowArr[i] = row[i-1] + row[i]
}
return rowArr
}
for(let i = 1; i < numRows; i++) {
Arr.push(setNextRow(Arr[i - 1]))
}
return Arr
};
