foo.cc: In function 'void work()':
foo.cc:39:26: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
           s[i][j] = (1<<i-1)|(1<<j-1);
                         ~^~
foo.cc:39:35: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
           s[i][j] = (1<<i-1)|(1<<j-1);
                                  ~^~
foo.cc:43:61: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
                if(dcmp(aa,a) && dcmp(bb,b)) s[i][j] |= (1<<k-1);
                                                            ~^~
foo.cc:47:50: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     for (int i = 1; i <= n; i++) s[i][i] |= (1<<i-1);
                                                 ~^~
foo.cc:32:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lf%lf",&x[i],&y[i]);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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