Compilare: user.cpp: In function ‘void BFS()’: user.cpp:23:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:35:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d", &n, &m, &S); ^ user.cpp:37:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &a, &b); ^