顺时针打印矩阵

#include <iostream>#include <vector>using namespace std;void print_circle(vector<vector<int> >arr,int cols,int rows,int start);void print_wisely(vector<vector<int> >arr,int cols,int rows);int main(){    int col,row;    while(cin>>col>>row)    {        vector<vector<int> >arr(row);        for(int i=0;i<arr.size();++i)        {            arr[i].resize(col);        }        for(int i=0;i<row;++i)        {            for(int j=0;j<col;++j)            {                cin>>arr[i][j];            }        }        print_wisely(arr,col,row);    }    return 0;}void print_wisely(vector<vector<int> >arr,int cols,int rows){    if(arr.size()==0||cols<=0||rows<=0)          return ;    int start = 0;    while(cols>start*2&&rows>start*2)    {        print_circle(arr,cols,rows,start);        ++start;    }}void print_circle(vector<vector<int> >arr,int cols,int rows,int start){    int endX = cols-start-1;    int endY = rows-start-1;    for(int i=start;i<=endX;++i)    {        cout<<arr[start][i]<<" ";    }    if(start<endY)    {        for(int i=start+1;i<=endY;++i)        {            cout<<arr[i][endX]<<" ";        }    }    if(start<endX&&start<endY)    {        for(int i=endX-1;i>=start;--i)        {            cout<<arr[endY][i]<<" ";        }    }    if(start<endX&&start<endY-1)    {        for(int i=endY-1;i>start;--i)//第一个数字不再打印        {            cout<<arr[i][start]<<" ";        }    }    //cout<<endl;}