魔方阵出问题了，麻烦看下啊

#include<iostream>
using namespace std;
int main()
{
    int n,i,j,k;                                                  //i表示行，j表示列，n表示阶数，k表示当前需要给数组填入的数字
    cout<<"请输入魔方阶数（奇数）："<<endl;                       //确定阶数
    cin>>n;
    int **a;                                                     
    a=new int *[n];
    for(i=0;i<=n-1;i++)
    {
        a[i]=new int [n];
    }
    for(i=0;i<n;i++)                                            
        for(j=0;j<n;j++)
            a[i][j]=0;
    a[0][(n-1)/2]=1;                                              //第一行中间元素赋值为1
    i=0;
    j=(n-1)/2;
    for(k=2;k<=n*n;k++)
    {
        if(i-1<0&&(j+1)>(n-1))                                     //*****向上向右同时越界填入下一列
        {
               a[i+1][j]=k;
            i++;
               continue;
        }
        if(a[i-1][j+1]!=0)                                          //*****下一位置已有数字则填入下一列
        {
               a[i+1][j]=k;
            i++;
               continue;
        }
        if(i-1<0)                                                 //单纯向上越界填入对边下一列
        {
            cout<<"判断3执行"<<endl;
            a[n-1-i][j+1]=k;
            i=n-1-i;j=j+1;
            continue;
        }
        if((j+1)>(n-1))                                                 //单纯向右越界填入对边上一行
        {
            cout<<"判断4执行"<<endl;
            a[i-1][n-1-j]=k;
            i=i-1;j=n-1-j;
            continue;
        }
        a[i-1][j+1]=k;
    }
    for(i=0;i<n;i++)           

    {
        for(j=0;j<n;j++)
        {
            cout<<a[i][j]<<' ';
        }
        cout<<endl;
    }
    return 0;
}
那个我发现*****这两个判断体进不去，怎么办啊？