reinvent.cpp: In function 'void citeste(int&)': reinvent.cpp:19: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result reinvent.cpp:24: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result reinvent.cpp: In function 'void bfs(int)': reinvent.cpp:39: warning: comparison between signed and unsigned integer expressions reinvent.cpp: In function 'int main()': reinvent.cpp:49: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result reinvent.cpp:50: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result