Pascal's Triangle
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] ]
class Solution { public: vector<vector<int> > generate(int numRows) { for(int i=0;i<numRows;i++){ if(i==0){ vector<int> a; a.push_back(1); vet.push_back(a); }else{ vector<int> a; for(int j=0;j<=i;j++){ if(j==0 || j==i) a.push_back(1); else{ a.push_back(vet[i-1][j-1]+vet[i-1][j]); } } vet.push_back(a); } } return vet; } private: vector<vector<int> > vet; };