题目：

题解：

func generate(numRows int) [][]int {ans := make([][]int, numRows)for i := range ans {ans[i] = make([]int, i+1)ans[i][0] = 1ans[i][i] = 1for j := 1; j < i; j++ {ans[i][j] = ans[i-1][j] + ans[i-1][j-1]}}return ans
}