/in/foo.cc: In function 'int main()':
/in/foo.cc:38:29: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(x[i]>x[j]||x[i]==x[j]&&y[i]>y[j])
                   ~~~~~~~~~~^~~~~~~~~~~
/in/foo.cc:63:17: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
    for(int j=i&i-1;j;j=i&j-1)
                ~^~
/in/foo.cc:63:27: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
    for(int j=i&i-1;j;j=i&j-1)
                          ~^~