一道蓝桥比赛的训练打印题【构造+不断的构造+构造规律】

#include <stdio.h>

int main()
{
    char s[150][150];
    int i, j, k;
    int n;
    scanf("%d", &n);
    int center=(9+(n-1)*4+1)/2;
    s[center][center]=‘$‘;
    for(j=center-2; j<=center+2; j++)
        s[center][j]=‘$‘;
    for(i=center-2; i<=center+2; i++)
        s[i][center]=‘$‘; //构造中心十字

    int dd=4; int ff=5;
    for(i=1; i<=n; i++){
        int up=center-dd;
        for(j=center-((ff-1)/2); j<=center+((ff-1)/2); j++)
            s[up][j]=‘$‘;

        int down=center+dd;
        for(j=center-((ff-1)/2); j<=center+((ff-1)/2); j++)
            s[down][j]=‘$‘;

        int left=center-dd;//列
        for(k=center-((ff-1)/2); k<=center+((ff-1)/2); k++)
            s[k][left]=‘$‘;

        int right=center+dd;
        for(k=center-((ff-1)/2); k<=center+((ff-1)/2); k++)
            s[k][right]=‘$‘;
        dd+=2;
        ff+=4;
    } //打印四个边栏
    for(i=1; i<=n; i++){
        //构造1个点
        int a, b;

        a=center-i*2;
        s[a][a]=‘$‘; s[a-1][a]=‘$‘; s[a][a-1]=‘$‘;

        b=center+i*2;
        s[b][b]=‘$‘; s[b][b+1]=‘$‘; s[b+1][b]=‘$‘;

        s[a][b]=‘$‘; s[a-1][b]=‘$‘; s[a][b+1]=‘$‘;

        s[b][a]=‘$‘; s[b][a-1]=‘$‘; s[b+1][a]=‘$‘;
    }

    for(i=1; i<=9+(n-1)*4; i++)
    {
        for(j=1; j<=9+(n-1)*4; j++)
            if(s[i][j]==‘$‘)
                printf("$");
            else
                printf(".");
        printf("\n");
    }
    return 0;
}