popas.cpp: In function 'int main()': popas.cpp:15: warning: unused variable 'k' popas.cpp:15: warning: unused variable 'now' popas.cpp:15: warning: unused variable 'current' popas.cpp:15: warning: unused variable 'u0' popas.cpp:15: warning: unused variable 'after' popas.cpp:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result popas.cpp:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result popas.cpp:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result popas.cpp:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result popas.cpp:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result popas.cpp:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result