Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:25:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[q[i]].size(); j++) { ~~^~~~~~~~~~~~~~~~ user.cpp: In function ‘char next_char()’: user.cpp:40:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, DIM, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:59:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("craciun.in", "r", stdin); ^ user.cpp:60:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("craciun.out", "w", stdout); ^