Maze

#include <wchar.h>
#include <locale.h>
#include <stdlib.h>
#include <time.h>

int fy[500][500];
int d[][2] = {{0, 1},{1, 0},{0, -1},{-1, 0}};
wchar_t yzfy[]= {L'　',L'┃',L'━',L'┛',L'┃',L'┃',L'┓',L'┫',
                 L'━',L'┗',L'━',L'┻',L'┏',L'┣',L'┳',L'╋'};

const int w=35, h=20, rw = w+2, rh = h+2;

int dfs(int y, int x)
{
    if (fy[y][x])
        return 0;
    else
        fy[y][x] |= 0x10;
    for (int f=rand()%4, i=0, p=rand()&1?3:1, u,v; i<4; ++i,f=(f+p)%4)
        if (dfs(v=y+d[f][0], u=x+d[f][1]))
            fy[y][x] |= 1<<f, fy[v][u] |= (1<<((f+2)%4));
    return 1;
}

int main()
{
    setlocale(LC_ALL, "");
    for (int y=0; y<rh; ++y) fy[y][0]|=10, fy[y][rw-1]|=10;
    for (int x=0; x<rw; ++x) fy[0][x]|=5, fy[rh-1][x]|=5;
    srand(time(NULL));
    dfs(w/2,h/2);
    fy[1][1] |= 12;
    fy[rh-2][rw-2] |= 3;
    for (int y=1; y<rh; ++y,putwchar(L'\n'))
        for (int x=1; x<rw; ++x)
            putwchar(yzfy[15^((fy[y-1][x-1]&3)|(fy[y][x]&12))]);
    return 0;
}