Learn how to calculate the sum of subset differences in C++ with detailed examples and explanations.
根据issac3 用Java总结了backtracking template, 我用他的方法改成了Python. 以下为template. 1 def backtrack(ans, temp, nums, start): # 可能有start, 也可能没有 2 if len(temp) == len(nums): 3 ans.append(temp) 4 else: 5 for i in range(start, len(nums)): 6 if nums[i] not in te...