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]]
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class Solution {public:vector<vector<int>> generate(int numRows) {vector<vector<int>> res;vector<int> vec;if(numRows <= 0) return res;for(int i=1; i <= numRows; i++) {vec.push_back(1);for(int j = 1; i>2 && j < res[i-1-1].size(); j++) {vec.push_back(res[i-2][j]+res[i-2][j-1]);}if(i > 1)vec.push_back(1);res.push_back(vec);vec.clear();}return res;}}
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