Problem
Given a non-negative index k where k ≤ 33, return the kth index row of the Pascal's triangle.
Note that the row index starts from 0.

In Pascal's triangle, each number is the sum of the two numbers directly above it.
Example
Input: 3
Output: [1,3,3,1]
Follow up:
Could you optimize your algorithm to use only O(k) extra space?
Code
static int var= [](){
std::ios::sync_with_stdio(false);
cin.tie(NULL);
return 0;
}();
class Solution {
public:
vector<int> getRow(int rowIndex) {
vector<int> res(rowIndex+1,0);
if(rowIndex>=0)
res[0] = 1;
for(int i=0;i<=rowIndex;i++){
for(int j=i;j>0;j--){
res[j] += res[j-1];
}
}
return res;
}
};
Result

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