4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: bool inMap(int H, int W, int y, int x)
4fd800b3a8 2011-02-23        kinaba: {
4fd800b3a8 2011-02-23        kinaba: 	return (0<=y && y<H && 0<=x && x<W);
4fd800b3a8 2011-02-23        kinaba: }