/in/foo.cc: In function 'int main()':
/in/foo.cc:30:77: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
      if(!(S3&S2)&&!(S3&S1)&&!(S3&map[i-2]))f[i&1][k][j]=max(f[i&1][k][j],f[i&1^1][l][k]+num[j]);
                                                                            ~^~