/in/foo.cc: In function 'bool cp(st, st)':
/in/foo.cc:26:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  return x.c<y.c||x.c==y.c&&x.a<y.a||x.c==y.c&&x.a==y.a&&x.b<y.b;
                  ~~~~~~~~^~~~~~~~~
/in/foo.cc:26:55: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  return x.c<y.c||x.c==y.c&&x.a<y.a||x.c==y.c&&x.a==y.a&&x.b<y.b;
                                     ~~~~~~~~~~~~~~~~~~^~~~~~~~~