#include <iostream>
#include <bitset>
 
using namespace std;
 
// たとえば、マップ上で水があって進めない状態のフラグ
const unsigned MAP_WATER = ( 1 << 16 );
// たとえば、謎の力で進めない状態のフラグ
const unsigned MAP_UNKNOWN_POW = ( 2 << 16 );
 
// １ : 何か物がある
// ０ : 普通の地面
int map[ 4 * 4 ] =
{
    0, 0, 1, 0,
    0, 0, 0, 1,
    1, 0, 0, 0,
    0, 1, 0, 0
};
 
// たとえば、 map[ 2 * 4 ]上に水を置きたいとき
void SetWaterFlag()
{
    map[ 2 * 4 ] |= MAP_WATER;
}
 
// 水がなくなって、通れないフラグを解除したいとき
void ResetWaterFlag()
{
    map[ 2 *  4 ] &= ~MAP_WATER;
}
 
void SetUnknownPowerFlag()
{
	map[ 3 * 1 ] |= MAP_UNKNOWN_POW;
}
 
void ResetUnknownPowerFlag()
{
	map[ 3 * 1 ] &= ~MAP_UNKNOWN_POW;
}
 
void PlayerAction()
{
	// プレイヤーの位置を水の上とした時
	// 分かりやすいように二進数で表示
 
	cout << "map" << endl;
	cout << std::bitset< 32 >( map[ 2 * 4 ] ) << endl;
 
	auto val = 0xFFFF0;
 
	cout << "0xFFFF0" << endl;
	cout << std::bitset< 32 >( val ) << endl;
 
	cout << ( 0xFFFF & map[ 2 * 4 ] ) << endl; 
 
	if( map[ 2 * 4 ] & MAP_WATER ) {
		cout << "水があっていけない" << endl;
	} else {
		cout << "いける" << endl;
	}
 
	cout << "map" << endl;
	cout << std::bitset< 32 >( map[ 3 * 1 ] ) << endl;
 
	if( map[ 3 * 1 ] & MAP_UNKNOWN_POW ) {
		cout << "謎の力があっていけない" << endl;
	} else {
		cout << "いける" << endl;
	}
}
 
int main()
{
	SetUnknownPowerFlag();
	SetWaterFlag();
 
	PlayerAction();
 
	ResetWaterFlag();
	ResetUnknownPowerFlag();
 
	PlayerAction();
 
	return 0;
}

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