Borderou de evaluare (job #382333)

Compilare: user.cpp: In function ‘void bfs()’: user.cpp:24:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘int main()’: user.cpp:81:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:56:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp:57:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] user.cpp: In function ‘char next_char()’: user.cpp:37:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]