問題 https://leetcode-cn.com/problems/pascals-triangle/
練習使用JavaScript解答
/**
* @param {number} numRows
* @return {number[][]}
*/
var generate = function(numRows) {
if(numRows < 1)
return [];
var arrd = [[1]];
for(var i=1; i < numRows; ++i) {
var arr =[1];
for(j=1; j<i; ++j) {
arr[j] = arrd[i-1][j-1] + arrd[i-1][j];
}
arr[j] = 1;
arrd[i] = arr;
}
return arrd;
};