Movie History Friends
Examples
Example 1:
Input: history = {1: ["M1", "M2", "M3", "M4", "M5"], 2: ["X", "Y", "M3", "M4", "M5"], 3: ["A", "B", "M3", "M4", "M5"]}, k = 3
Output: [[1, 2], [1, 3], [2, 3]]
Explanation:
Example 2:
Input: history = {1: ["A", "B", "C"], 2: ["X", "B", "C"], 3: ["A", "B", "C"]}, k = 3
Output: [[1, 3]]
Explanation:
Example 3:
Input: history = {1: ["A", "B"], 2: ["C", "D", "E"]}, k = 3
Output: []
Explanation: