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top-100-liked/20/20_test.go

@@ -0,0 +1,30 @@
+package top100liked
+
+import (
+	"fmt"
+	"testing"
+)
+
+// https://leetcode.cn/problems/rotate-image/?envType=study-plan-v2&envId=top-100-liked
+
+func rotate(matrix [][]int) {
+	n := len(matrix)
+	for i := range (n-1)/2 + 1 {
+		for j := i; j < max(j, n-i-1); j++ {
+			tmp := matrix[i][j]
+			for range 4 {
+				matrix[j][n-i-1], tmp = tmp, matrix[j][n-i-1]
+				i, j = j, n-i-1
+			}
+		}
+	}
+}
+
+func TestS20(t *testing.T) {
+	matrix := [][]int{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}
+	rotate(matrix)
+	fmt.Printf("%+v\n", matrix)
+	matrix = [][]int{{5, 1, 9, 11}, {2, 4, 8, 10}, {13, 3, 6, 7}, {15, 14, 12, 16}}
+	rotate(matrix)
+	fmt.Printf("%+v\n", matrix)
+}