Pascal's Triangle II c++
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原题目:
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) { vector<int> v(rowIndex + 1); if(rowIndex < 0) return v; v[0] = 1; for(int i = 0;i <= rowIndex;i++) { for(int j = i;j > 0;j--) v[j] = v[j] + v[j-1]; } return v; }};
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