Compilare: user.cpp: In function ‘void BFS()’: user.cpp:17:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < l[c[p]].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:43:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d\n",&n, &m, &s); ^ user.cpp:46:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d\n",&x,&y); ^