Wrong Answer
/in/foo.cc: In function 'int main()': /in/foo.cc:21:6: warning: 'e_t' may be used uninitialized in this function [-Wmaybe-uninitialized] time=e_t-s_t;//算出耗时所用时间 ~~~~^~~~~~~~ /in/foo.cc:21:6: warning: 's_t' may be used uninitialized in this function [-Wmaybe-uninitialized]
