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) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
vector<vector<int> > ret;
vector<int> cur(1,1);
if(numRows==0)
return ret;
ret.push_back(cur);
for(int i=1 ; i<numRows ; i++){
vector<int> temp;
temp.push_back(1);
for(int j=1 ; j<cur.size() ; j++)
temp.push_back(cur[j-1]+cur[j]);
temp.push_back(1);
cur=temp;
ret.push_back(temp);
}
return ret;
}
};