/in/foo.cc: In function 'int main()':
/in/foo.cc:23:35: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
                     ab[i] |= (1<<j-1);
                                  ~^~
/in/foo.cc:30:27: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
                 if(i&(1<<j-1))
                          ~^~
/in/foo.cc:37:29: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
                 if(!(i&(1<<j-1)) && (cc[i]&(1<<j-1)))
                            ~^~
/in/foo.cc:37:49: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
                 if(!(i&(1<<j-1)) && (cc[i]&(1<<j-1)))
                                                ~^~
/in/foo.cc:38:31: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
                     dp[i|(1<<j-1)] += dp[i];
                              ~^~