leetcode 118.杨辉三角

⭐️ 题目描述

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🌟 leetcode链接：https://leetcode.cn/problems/pascals-triangle/description/

代码：

class Solution {
public:vector<vector<int>> generate(int numRows) {// 先开空间vector<vector<int>> v;v.resize(numRows);for (int i = 0; i < v.size(); i++) {v[i].resize(i + 1);// 第一个元素和最后一个元素初始化为1v[i][0] = 1;v[i][v[i].size() - 1] = 1;}for (int i = 2; i < v.size(); i++) {for (int j = 1; j < i; j++) {v[i][j] = v[i - 1][j] + v[i - 1][j - 1];}}return v;}
};

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