C++ 2 lines

  • 1

    Note the trick with unsigned int to handle -1 as the large positive number. BTW, when counting lines, I only include lines with logic; so I do not count things like method signatures and closing brackets.

    unsigned int minValue(TreeNode* r, int v) {
        return r->val != v ? r->val : r->left == nullptr ? -1 : min(minValue(r->left, v), minValue(r->right, v));
    int findSecondMinimumValue(TreeNode* root) {
        return minValue(root, root->val);

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