tmp_code

Posted 2021-01-19 youdias

bool cmpX(vector<int> a,vector<int> b)
{
	return a[0]<b[0];
}
bool cmpY(vector<int> a, vector<int> b)
{
	return a[1]<b[1];
}
class Solution939
{
public:
	int minAreaRect(vector<vector<int>>& points)
	{
		int ret = INT_MAX;
		for (int i = 0; i < points.size(); i++)
		{
			vector<vector<int> > getxs;
			vector<vector<int> > getys;
			//得到X值相同的点
			getxs = GetXs(points, 0, points[i]);
			//得到Y值相同的点
			getys = GetYs(points, 0, points[i]);
			int tmparea = GetMiniRect(points, getxs, getys, points[i]);
			if (ret > tmparea)
			{
				ret = tmparea;
			}			
		}
		if (ret == INT_MAX)
		{
			ret = 0;
		}
		return ret;
	}
	int GetMiniRect(vector<vector<int> > points, vector<vector<int> > Xs,vector<vector<int> > Ys,vector<int> startpoint)
	{
		int ret=INT_MAX;
		vector<int> tmpx;
		vector<int> tmpy;
		//一条水平线上的，按照y排序
		sort(Xs.begin(), Xs.end(),cmpY); 
		//一条竖直线上的，按照x排序
		sort(Ys.begin(), Ys.end(),cmpX);

		int x1 = 0;
		int x2 = 0;
		int y1 = 0;
		int y2 = 0;

		x1 = startpoint[0];
		y1 = startpoint[1];
		for (int i = 0; i < Xs.size(); i++)
		{
			y2 = Xs[i][1];
			for (int j = 0; j < Ys.size(); j++)
			{
				x2 = Ys[i][0];
				vector<int> tmp = vector < int > {x2, y2};
				if (std::find(points.begin(), points.end(), tmp) != points.end())
				{
					ret = (x2 - x1)*(y2 - y1);	
					return ret;
				}
				else
				{
					continue;
				}
			}
		}
		return ret;
	}
	vector<vector<int> > GetXs(vector<vector<int> > points, int begin, vector<int> target)
	{
		vector<vector<int> > ret;
		for (int i = begin; i < points.size(); i++)
		{
			if (points[i] == target)
			{
				continue;
			}
			if (points[i][0] == target[0] && points[i][1] > target[1] )
			{
				ret.emplace_back(points[i]);
			}
		}
		return ret;
	}
	vector<vector<int> > GetYs(vector<vector<int> > points, int begin, vector<int> target)
	{
		vector<vector<int> > ret;
		for (int i = begin; i < points.size(); i++)
		{
			if (points[i] == target)
			{
				continue;
			}
			if (points[i][1] == target[1] && points[i][0] > target[0])
			{
				ret.emplace_back(points[i]);
			}
		}
		return ret;
	}
};