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]]

c++代码如下：

#include
     
      #include
      
       using namespace std;class Solution {public:    vector
       
        
          > generate(int numRows) {        int i;        vector
         
          
            > vec(numRows); for(i=0;i
           

getRow(int rowIndex) { if(rowIndex==0) return { 1}; vector

vec1(rowIndex); vector

vec2(rowIndex+1); vec1=getRow(rowIndex-1); vec2[0]=1; for(int i=1;i

>n; vector

> vec=s.generate(n); for(auto v:vec) { for(auto a:v) cout<

<<" "; cout<