剑指offer 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。
- 题目解答
设定好left、right、top、bottom，然后依次打印。
class Solution {
public:
vector<int> printMatrix(vector<vector<int> > matrix) {
int row = matrix.size();
int col = matrix[0].size();
vector<int> ret;
if (row == 0 || col == 0)
return ret;
int left = 0, top = 0, right = col - 1, bottom = row - 1;
while (left <= right && top <= bottom){
for (int i = left; i <= right; ++i)
ret.push_back(matrix[top][i]);
for (int i = top + 1; i <= bottom; ++i)
ret.push_back(matrix[i][right]);
if (top != bottom){
for (int i = right - 1; i >= left; --i)
ret.push_back(matrix[bottom][i]);
}
if (left != right){
for (int i = bottom - 1; i > top; --i)
ret.push_back(matrix[i][left]);
}
left++;
top++;
right--;
bottom--;
}
return ret;
}
};