Compilare: main.cpp: In function 'int BFS(int, int)': main.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Gph[node].size(); i++) ~~^~~~~~~~~~~~~~~~~~ main.cpp:49:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'void Read(int&)': main.cpp:24:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:29:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp: In function 'int main()': main.cpp:54:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.out", "w", stdout); ^