Compilare: user.cpp: In function ‘int main()’: user.cpp:29:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, s, t, d, c, x, y, a, b; ^ user.cpp:29:18: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, s, t, d, c, x, y, a, b; ^ user.cpp:29:21: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, s, t, d, c, x, y, a, b; ^ user.cpp:26:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid3.in","r",stdin); ^ user.cpp:27:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euclid3.out","w",stdout); ^ user.cpp:31:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:33:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&a,&b,&c); ^