Compilare: user.cpp: In function ‘int main()’: user.cpp:28:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,x=0,p=0,cnt2=0,cnt=0; ^ user.cpp:28:19: warning: unused variable ‘p’ [-Wunused-variable] int n,i,j,x=0,p=0,cnt2=0,cnt=0; ^ user.cpp:26:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("coins.in","r",stdin); ^ user.cpp:27:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("coins.out","w",stdout); ^ user.cpp:29:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:36:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^