[Leetcode]118. Pascal's Triangle
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Given numRows, generate the first numRows of Pascal's triangle.
For example, given numRows = 5,
Return
[ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1]]
下一行第一个和最后一个元素初始化为1,其余元素分别等于上一行左上角和右上角元素之和。
class Solution {public: vector<vector<int>> generate(int numRows) { vector<vector<int>> result; vector<int> array; for (int i = 1; i <= numRows; ++i) { for (int j = i -2; j > 0; --j) array[j] = array[j-1] + array[j]; array.push_back(1); result.push_back(array); } return result; }};
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