#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *arr;
int len, n;

void draw_h(int x, int y, int hlen)
{
    int p = y * len + x;
    while (hlen--)
        arr[p++] = '$';
}

void draw_v(int x, int y, int hlen)
{
    int p = y * len + x;
    while (hlen--)
    {
        arr[p] = '$';
        p += len;
    }
}

void draw(int layer)
{
    int xl = layer * 2;
    int xr = len - 1 - xl;
    int yt = (layer - 1) * 2;
    int yb = len - 1 - (layer - 1) * 2;
    int border = 5 + (n - layer) * 4;
    
    // 图案第一行（以及倒数第一行）
    draw_h(xl, yt, border);
    draw_h(xl, yb, border);
    
    // 图案第二行 （以及倒数第二行）
    draw_h(xl, yt + 1, 1);
    draw_h(xr, yt + 1, 1);
    draw_h(xl, yb - 1, 1);
    draw_h(xr, yb - 1, 1);
    
    // 图案第三行（以及倒数第三行）
    draw_h(xl - 2, yt + 2, 3);
    draw_h(xr, yt + 2, 3);
    draw_h(xl - 2, yb - 2, 3);
    draw_h(xr, yb - 2, 3);
    
    // 两边的竖线
    draw_v(xl - 2, yt + 2, border);
    draw_v(xr + 2, yt + 2, border);
}

int main(void)
{
    int x, y, size;
    char *pArr;
    scanf("%d", &n);
    len = 5 + 4 * n;
    
    size = len * len * sizeof(char);
    pArr = arr = (char *)malloc(size);
    
    // 画每一层图案（不是每一行）
    memset(arr, '.', size);
    for (x = 1; x <= n; x++)
        draw(x);
        
    // 画中心十字
    draw_v(2 * n + 2, len / 2 - 2, 5);
    draw_h(2 * n, len / 2, 5);
    
    for (y = 0; y < len; y++)
    {
        for (x = 0; x < len; x++)
            putchar(*pArr++);
        putchar('\n');
    }
    free(arr);
    return 0;
}

评测结果  正确
得分  100 

一个图案一个图案画就行了，不要一行一行画。

10
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--------------------------------
Process exited after 1.411 seconds with return value 0
Press any key to continue . . .

排版太乱了。。。