foo.c:2:21: warning: missing braces around initializer [-Wmissing-braces]
 int w[21][21][21] = {1};    //用数组储存结果
                     ^
foo.c:2:21: note: (near initialization for 'w')
foo.c: In function 'main':
foo.c:26:39: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     while(scanf("%d%d%d", &a, &b, &c) && (a + 1) || (b + 1) || (c + 1))  
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~

自豪地采用[jd5](https://github.com/masnn/jd5)进行评测