CPP
cpp
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#include <iostream>
#include <chrono>
#include <cmath>
#include <algorithm>
#include <set>
#include <vector>
#include <deque>
#include <memory>
enum OPERATION
{
NO_OP,
UP,
DOWN,
LEFT,
RIGHT
};
static constexpr const char* Direction[] = { "", "Up", "Down", "Left", "Right" };
struct Node
{
std::vector< short > _state;
std::vector< OPERATION > _path;
OPERATION _operation;
size_t _level;
Node( std::vector< short >& state, OPERATION operation, Node* parent )
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