Random Node in A Binary Tree
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转自:http://www.fgdsb.com/tags/Random/
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void randNodeImp(const TreeNode * node, int & idx, const TreeNode * & r) {if (!node) return;if (rand(idx) == 0)r = node;randNodeImp(node->left, ++idx, r);randNodeImp(node->right, ++idx, r);}const TreeNode * randNode(const TreeNode * root) {int idx = 1;const TreeNode * r = 0;randNodeImp(root, idx, r);return r;}
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