Compilare: user.cpp: In function ‘int main()’: user.cpp:23:9: warning: unused variable ‘n’ [-Wunused-variable] int n, i, j, s, t, d, x, y, a, b, ma; ^ user.cpp:23:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, s, t, d, x, y, a, b, ma; ^ user.cpp:23:18: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, s, t, d, x, y, a, b, ma; ^ user.cpp:23:21: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, s, t, d, x, y, a, b, ma; ^ user.cpp:23:24: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, s, t, d, x, y, a, b, ma; ^ user.cpp:20:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("difprim.in","r",stdin); ^ user.cpp:21:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("difprim.out","w",stdout); ^ user.cpp:26:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^