Compilare: user.cpp: In function ‘int cup(int)’: user.cpp:31:11: warning: unused variable ‘a’ [-Wunused-variable] int i,a; ^ user.cpp: In function ‘int main()’: user.cpp:58:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,p=1,nr=0,ans=0; ^ user.cpp:58:13: warning: unused variable ‘p’ [-Wunused-variable] int i,j,p=1,nr=0,ans=0; ^ user.cpp:58:17: warning: unused variable ‘nr’ [-Wunused-variable] int i,j,p=1,nr=0,ans=0; ^ user.cpp:56:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaje.in","r",stdin); ^ user.cpp:57:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaje.out","w",stdout); ^ user.cpp:61:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(si+1,nmax*6,sizeof(char),stdin); ^