[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]]
这道题是生成杨辉三角的前n行数据,题目难度为Easy。
杨辉三角相信大家都不陌生,每行首尾数字为1,其他部分数字为它两肩上两个数字之和,具体代码:
class Solution {public: vector<vector<int>> generate(int numRows) { vector<vector<int>> ret(numRows); for(int i=0; i<numRows; ++i) { ret[i].push_back(1); for(int j=1; j<i; ++j) ret[i].push_back(ret[i-1][j-1] + ret[i-1][j]); if(i) ret[i].push_back(1); } return ret; }};
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