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#include <vector> using std::vector; class Solution { public: vector<vector<int>> generate(int numRows) { vector<vector<int>> vec; for (int i = 0; i < numRows; ++i) { vector<int> row; if (!vec.empty()) row.assign(vec.at(i - 1).begin(), vec.at(i - 1).end()); row.push_back(1); for (int j = i - 1; j > 0; --j) row[j] += row[j - 1]; vec.push_back(row); } return vec; } };