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;
}

posted @ 2020-05-25 20:13  转瞬即逝1995  阅读(117)  评论(0编辑  收藏  举报