petrom.cpp: In function 'int main()': petrom.cpp:72: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x petrom.cpp:72: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x petrom.cpp:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result petrom.cpp:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result