Given an index k, return the kth row of the Pascal's triangle.
For example, given k = 3,
Return [1,3,3,1]
.
Note:
Could you optimize your algorithm to use only O(k)
extra space?
class Solution {
public:
vector<int> getRow(int rowIndex) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
vector<int> cur;
cur.push_back(1);
for(int i=1 ; i<=rowIndex ; i++){
vector<int> temp;
temp.push_back(1);
for(int j=1 ; j<i ; j++)
temp.push_back(cur[j-1]+cur[j]);
temp.push_back(1);
cur=temp;
}
return cur;
}
};