Description

P1: 'Subset generation base case' → if index == len(nums): result.append(current.___()) [copy]. P2: 'Include/exclude choice' → current.append(nums[index]); backtrack(index+___); current.pop() ← backtrack! [1]. P3: 'N-Queens: is position safe?' → Check same row: if board[row][c] for c in range(col):

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