Compilare: user.cpp: In function ‘void Read()’: user.cpp:47:17: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] char sign = NULL; ^ user.cpp: In function ‘void Write()’: user.cpp:185:48: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘Sum’ [-Wformat=] fprintf(fout, "%lld\n", sums[a][b][n-1]); ^ user.cpp: In function ‘void Read()’: user.cpp:49:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:53:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%c", &sign); ^ user.cpp:56:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &searchedVal); ^