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。

class Solution {
public:
    vector<int> getRow(int rowIndex) {
        vector<int> vals;
        
        vals.resize(rowIndex+1);
        vals[0] = 1;
        
        for(int i = 1; i <= rowIndex;i++)
            vals[i] = (long long)vals[i-1]*(rowIndex-i+1)/i;
            
        return vals;
    }
};