c++关键词
int {long long} float double char bool
if else while for break continue
include namespace main return cin cout
int {long long} float double char bool
if else while for break continue
include namespace main return cin cout
int {long long} float double char bool
if else while for break continue
include namespace main return cin cout
int {long long} float double char bool
if else while for break continue
include namespace main return cin cout
int {long long} float double char bool
if else while for break continue