/in/foo.cc: In function 'bool ckk(int)':
/in/foo.cc:25:23: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
     return ckk_int[j] = 0;
            ~~~~~~~~~~~^~~
/in/foo.cc:30:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  return ckk_int[j] = 1;
         ~~~~~~~~~~~^~~
/in/foo.cc: In function 'bool ckk(int, int)':
/in/foo.cc:66:30: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
     return ckk_int_int[j][k] = 0;
            ~~~~~~~~~~~~~~~~~~^~~
/in/foo.cc:70:27: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  return ckk_int_int[j][k] = 1;
         ~~~~~~~~~~~~~~~~~~^~~
/in/foo.cc: In function 'bool cckk(int, int)':
/in/foo.cc:92:31: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
     return cckk_int_int[j][k] = 0;
            ~~~~~~~~~~~~~~~~~~~^~~
/in/foo.cc:96:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  return cckk_int_int[j][k] = 1;
         ~~~~~~~~~~~~~~~~~~~^~~