顺时针打印矩阵

题目描述

输入一个矩阵，按照从外向里以顺时针的顺序依次打印出每一个数字，例如，如果输入如下4 X 4矩阵： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 则依次打印出数字1,2,3,4,8,12,16,15,14,13,9,5,6,7,11,10.

class Solution {
public:
vector<int> printMatrix(vector<vector<int> > matrix) 
{
	vector<int> ans;
	int row = matrix.size();
	if (row < 1)
		return ans;

	int col = matrix[0].size();

	int m = 0, n = 0;
	row--;
	col--;
	for (int num = 0; num < (min(matrix.size(),matrix[0].size()) + 1) / 2; num++)
	{
		for (int i = n; i <= col; i++)
			ans.push_back(matrix[m][i]);
		m++;

		for (int i = m; i <= row; i++)
		{
			//cout << i << col << row << endl;
			ans.push_back(matrix[i][col]);
		}
		col--;

		for (int i = col; i >= n&&m<=row; i--)
			ans.push_back(matrix[row][i]);
		row--;
		
		for (int i = row; i >= m&&n<=col;i--)
			ans.push_back(matrix[i][n]);
		n++;
	}
	return ans;
}
};