給定一個矩陣 A， 返回 A 的轉置矩陣。
矩陣的轉置是指将矩陣的主對角線翻轉，交換矩陣的行索引與列索引。
示例 1：輸入：[[1,2,3],[4,5,6],[7,8,9]]輸出：[[1,4,7],[2,5,8],[3,6,9]]
示例 2：輸入：[[1,2,3],[4,5,6]]輸出：[[1,4],[2,5],[3,6]]
提示：
1 <= A.length <= 1000
1 <= A[0].length <= 1000
解題思路分析1、遍曆；時間複雜度O(n^2)，空間複雜度O(n^2)
func transpose(A [][]int) [][]int {
m, n := len(A), len(A[0])
res := make([][]int, n)
for i := 0; i < n; i {
res[i] = make([]int, m)
}
for i := 0; i < m; i {
for j := 0; j < n; j {
res[j][i] = A[i][j]
}
}
return res
}
Easy題目，矩陣轉置基本操作，i,j下标對調
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