60分不明为何RE 求助大佬

#include<cmath>
#include<iostream>
#include<cstdio>
using namespace std;
int n,a[50][50],b[50],c[50];
int main()
{
    freopen("2615.in","r",stdin);
    freopen("2615.out","w",stdout);
    cin>>n;
    a[1][n/2+1]=1;
    b[1]=1;
    c[1]=n/2+1;
    for (int i=2;i<=n*n;i++)
    {
        if (b[i-1]==1 && c[i-1]!=n) 
        {
            b[i]=n;
            c[i]=c[i-1]+1;
        }
        if (c[i-1]==n && b[i-1]!=1)
        {
            b[i]=b[i-1]-1;
            c[i]=1;
        }
        if (b[i-1]==1 && c[i-1]==n)
        {
            b[i]=b[i-1]+1;
            c[i]=c[i-1];
        }
        if (c[i-1]!=n && b[i-1]!=1)
        {
            if (a[b[i-1]-1][c[i-1]+1]==0) {b[i]=b[i-1]-1;c[i]=c[i-1]+1;} else
            {b[i]=b[i-1]+1;c[i]=c[i-1];}
        }
        a[b[i]][c[i]]=i;
    }
    for (int i=1;i<=n;i++)
    {
    for (int j=1;j<=n;j++)
    printf("%d ",a[i][j]);
    printf("\n");
    }
    return 0;
}