Compilare: user.cpp: In function ‘void bf()’: user.cpp:19:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<L[a].size();i++){ ^ user.cpp: In function ‘int verif(int)’: user.cpp:40:33: 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:59:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&k); ^ user.cpp:61:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[i]); ^ user.cpp:63:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&m); ^ user.cpp:65:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d%d",&a,&b,&c,&d); ^