[LeetCode]Path Sum系列

阿新 • • 發佈：2018-01-27

post 條件 paths path sum 發現負數 gpo span 二叉樹

1.二叉樹路徑求指定和，需要註意的是由於有負數，所以即使發現大於目標值也不能返回false，而且返回true的條件有兩個，到葉節點且等於sum，缺一不可

public boolean hasPathSum(TreeNode root, int sum) {
        if (root==null) return false;
        if (root.val==sum&&root.left==null&&root.right==null) return true;
        else return hasPathSum(root.left,sum-root.val)||hasPathSum(root.right,sum- root.val);
    }

post 條件 paths path sum 發現負數 gpo span 二叉樹 1.二叉樹路徑求指定和，需要註意的是由於有負數，所以即使發現大於目標值也不能返回false，而且返回true的條件有兩個，到葉節點且等於sum，缺一不可 public boolean ha

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[LeetCode]Path Sum系列

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