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kth_node_in_tree.cc
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kth_node_in_tree.cc
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#include <istream>
#include <memory>
#include <string>
#include <vector>
#include "test_framework/binary_tree_utils.h"
#include "test_framework/generic_test.h"
#include "test_framework/serialization_traits.h"
#include "test_framework/test_failure.h"
using std::unique_ptr;
template <typename T>
struct BinaryTreeNode {
T data;
unique_ptr<BinaryTreeNode<T>> left, right;
int size;
};
const BinaryTreeNode<int>* FindKthNodeBinaryTree(
const unique_ptr<BinaryTreeNode<int>>& tree, int k) {
// TODO - you fill in here.
return nullptr;
}
template <typename KeyT>
struct SerializationTraits<std::unique_ptr<BinaryTreeNode<KeyT>>>
: BinaryTreeSerializationTraits<std::unique_ptr<BinaryTreeNode<KeyT>>,
false> {
using serialization_type = std::unique_ptr<BinaryTreeNode<KeyT>>;
using base =
BinaryTreeSerializationTraits<std::unique_ptr<BinaryTreeNode<KeyT>>,
false>;
static serialization_type Parse(const std::string& str) {
auto tree = base::Parse(str);
InitSize(tree);
return std::move(tree);
}
static serialization_type JsonParse(const json_parser::Json& json_object) {
auto tree = base::JsonParse(json_object);
InitSize(tree);
return std::move(tree);
}
private:
static int InitSize(const serialization_type& node) {
if (!node) return 0;
node->size = 1 + InitSize(node->left) + InitSize(node->right);
return node->size;
}
};
namespace detail {
template <typename KeyT>
struct IsBinaryTreeImpl<std::unique_ptr<BinaryTreeNode<KeyT>>>
: std::true_type {};
} // namespace detail
int FindKthNodeBinaryTreeWrapper(const unique_ptr<BinaryTreeNode<int>>& tree,
int k) {
auto result = FindKthNodeBinaryTree(tree, k);
if (!result) {
throw TestFailure("Result can't be nullptr");
}
return result->data;
}
int main(int argc, char* argv[]) {
std::vector<std::string> args{argv + 1, argv + argc};
std::vector<std::string> param_names{"tree", "k"};
return GenericTestMain(args, "kth_node_in_tree.cc", "kth_node_in_tree.tsv",
&FindKthNodeBinaryTreeWrapper, DefaultComparator{},
param_names);
}