foo.cc: In function 'void cx()':
foo.cc:70:18: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
       if (a[x]^xx==0) a[y]=yy^1,bb=true,b[y]=true;
                ~~^~~
foo.cc:72:18: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
       if (a[y]^yy==0) a[x]=xx^1,bb=true,b[x]=true;
                ~~^~~
foo.cc:82:18: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
       if (a[x]^xx==1) a[y]=yy^1,bb=true,b[y]=true;
                ~~^~~
foo.cc:84:18: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
       if (a[y]^yy==0) a[x]=xx^0,bb=true,b[x]=true;
                ~~^~~
foo.cc:93:14: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
  if (a[ans]^f==1 && b[ans]) printf("Yes\n");
             ~^~~

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