01 2022 档案
摘要:public List<List> combinationSum(int[] candidates, int target) { List<List> ans = new ArrayList<>(); List combine = new ArrayList<>(); dfs(candidates,
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摘要:private boolean[][] r = new boolean[9][9]; private boolean[][] c = new boolean[9][9]; private boolean[][][] x = new boolean[3][3][9]; private boolean
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