Compilare: user.cpp: In function ‘int bf()’: user.cpp:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<L[a].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:87:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<L[i].size(); j++ ){ ^ user.cpp:46:32: 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,&e); ^ user.cpp:48:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&a,&b,&aa); ^