foo.cc: In function 'int main()':
foo.cc:21:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (size_t i = 0; i < n; i++)
                        ~~^~~
foo.cc:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (size_t i = 0; i < n; i++)
                        ~~^~~

正在同步测试数据，请稍后
自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。