119. Pascal's Triangle II

class Solution {
public:
    vector<int> getRow(int rowIndex) {
      vector<int> v(rowIndex+1);
        v[0]=1;
        for(int i=1;i<=rowIndex;i++)
            for(int j=i+1;j>0;j--)
                v[j]=v[j]+v[j-1];
        return v;
    }
};