using System; using System.Collections.Generic; class Solution { /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param num int整型 * @return int整型二维数组 */ public List<List<int>> generate (int num) { // write code here List<List<int>> lsls = new List<List<int>>(); lsls.Add(new List<int>() { 1 }); for (int i = 1; i < num; i++) { List<int> ls = new List<int>(); lsls.Add(ls); for (int j = 0; j < i + 1; j++) { int nUB = j - 1 < 0 || j > lsls[i - 1].Count ? 0 : lsls[i - 1][j - 1]; int nU = j >= lsls[i - 1].Count ? 0 : lsls[i - 1][j]; ls.Add(nUB + nU); } } return lsls; } }