CPP
cpp
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#include <iostream>
#include <chrono>
#include <cmath>
#include <algorithm>
#include <set>
#include <vector>
#include <deque>
enum OPERATION {NO_OP, UP, DOWN, LEFT, RIGHT};
struct Node {
std::vector<short> _state;
OPERATION _operation;
Node* _parent;
size_t _level;
Node(std::vector<short>& state, OPERATION operation, Node* parent, size_t level) :
_state{state},
_operation{operation},
_parent{parent},
_level{level}
{
}
};
struct Equal {
std::vector<short> _v;
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