【leetcode】【118】Pascal's Triangle
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一、问题描述
Given numRows, generate the first numRows of Pascal's triangle.
For example, given numRows = 5,
Return
[ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1]]
二、问题分析
杨辉三角问题,比较简单。直接上代码。
三、Java AC代码
public List<List<Integer>> generate(int numRows) { List<Integer> inner;List<List<Integer>> outer = new ArrayList<List<Integer>>();if (numRows<=0) {return outer;}for(int i=0;i<numRows;i++){inner = new ArrayList<Integer>();for(int j=0;j<=i;j++){if(j==0||j==i){inner.add(1);}else {inner.add(outer.get(i-1).get(j-1)+outer.get(i-1).get(j));}}outer.add(inner);}return outer; }
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