[C++]蛇形填数

[从左下角开始，逆时针蛇形填数]

 #include <iostream>
 using namespace std;

 int main() {
     int n;
     cin>>n;
     int **p=new int*[n];
     for(int i=;i<n;i++)
     {
         p[i]=new int[n];
         for(int j=;j<n;j++)
             p[i][j]=;
     }

     int x,y;
     int total=p[x=n-][y=]=;

     while(total<n*n)
     {
         while(y+<n&&!p[x][y+])p[x][++y]=++total;
         while(x->=&&!p[x-][y])p[--x][y]=++total;
         while(y->=&&!p[x][y-])p[x][--y]=++total;
         while(x+<n&&!p[x+][y])p[++x][y]=++total;
     }

     for(int i=;i<n;i++)
     {
         for(int j=;j<n;j++)
             cout<<p[i][j]<<"\t";
         cout<<endl;
     }

     return ;
 }