顺时针打印矩阵
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) {
int row = matrix.size();
int col = matrix[0].size();
vector<int> res;
if(row == 0 || col == 0)
return res;
int left=0,top=0,right=col-1,bottom = row -1;
while(left <= right && top <= bottom)
{
for(int i =left;i<=right;i++)
res.push_back(matrix[top][i]);
for(int i = top+1;i<=bottom;i++)
res.push_back(matrix[i][right]);
if(top != bottom)
for(int i = right-1;i>=left;i--)
res.push_back(matrix[bottom][i]);
if(left!= right)
for(int i =bottom-1;i>top;i--)
res.push_back(matrix[i][left]);
left++,top++,right--,bottom--;
}
return res;
}