Compilare: user.cpp: In function ‘int BFS1()’: user.cpp:21:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < E[term].size(); ++i) { ^ user.cpp: In function ‘int BFS2()’: user.cpp:42:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < E[get<0>(term)].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:59:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ user.cpp:64:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y); ^ user.cpp: In function ‘int BFS1()’: user.cpp:28:9: warning: ‘term’ may be used uninitialized in this function [-Wmaybe-uninitialized] return term; ^