finish Problem 48

Author: aQua

Algorithms/0048.rotate-image/README.md

@@ -9,7 +9,7 @@ Follow up:
 Could you do this in-place?
 
 ## 解题思路
-
+对应的4个点，依次互换位置。
 
 ## 总结
 

Algorithms/0048.rotate-image/rotate-image.go

@@ -4,7 +4,12 @@ func rotate(m [][]int) {
 	n := len(m)
 	for i := 0; i < n/2; i++ {
 		for j := i; j < n-i-1; j++ {
-			m[j+i][i]
+			temp := m[i][j]
+			// 左边的行 等于 右边的列
+			m[i][j] = m[n-j-1][i]
+			m[n-j-1][i] = m[n-i-1][n-j-1]
+			m[n-i-1][n-j-1] = m[j][n-i-1]
+			m[j][n-i-1] = temp
 		}
 	}
 }

Algorithms/0048.rotate-image/rotate-image_test.go

@@ -40,6 +40,21 @@ func Test_Problem0048(t *testing.T) {
 			}},
 		},
 
+		question{
+			para{[][]int{
+				[]int{1, 1, 1, 1},
+				[]int{2, 2, 2, 2},
+				[]int{3, 3, 3, 3},
+				[]int{4, 4, 4, 4},
+			}},
+			ans{[][]int{
+				[]int{4, 3, 2, 1},
+				[]int{4, 3, 2, 1},
+				[]int{4, 3, 2, 1},
+				[]int{4, 3, 2, 1},
+			}},
+		},
+
 		// 如需多个测试，可以复制上方元素。
 	}