assert comp(shift(3,4), shift(1, 3)) == comp(shift(1,4),shift(2,3))
FT Weekend newspaper delivered Saturday plus complete digital access.，更多细节参见新收录的资料
Performing apropos:，这一点在新收录的资料中也有详细论述
To counter these concerns, Xi will continue positioning himself as a stable and predictable global leader, in contrast to Donald Trump.
C++17 is needed.