Compilare: user.cpp: In function ‘void Fill(int)’: user.cpp:91:65: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<members[iter-1][i][j].memDetails.size();k++) ^ user.cpp: In function ‘void Read()’: user.cpp:49:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld %lld", &a, &b); ^