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119. Pascal's Triangle II

Given an index k, return the kth row of the Pascal‘s triangle.

For example, given k = 3,
Return [1,3,3,1].

 

分析 二项式展开式的系数 不加(long long)提交会出错。

 

 1 class Solution { 2 public: 3     vector<int> getRow(int rowIndex) { 4         vector<int> vals; 5          6         vals.resize(rowIndex+1); 7         vals[0] = 1; 8          9         for(int i = 1; i <= rowIndex;i++)10             vals[i] = (long long)vals[i-1]*(rowIndex-i+1)/i;11             12         return vals;13     }14 };

 

119. Pascal's Triangle II