Compilare: user.cpp: In function ‘int main()’: user.cpp:30:30: warning: unused variable ‘r’ [-Wunused-variable] int n, m, a, b, c, d, e, r, x, i; ^ user.cpp:34:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d%d%d%d", &n, &m, &a, &b, &c, &d, &e); ^ user.cpp:36:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^