Compilare: user.cpp: In function ‘int main()’: user.cpp:112:29: warning: unused variable ‘d’ [-Wunused-variable] short a[40],b[40],c[40],d[40],r[40],hn[40]; ^ user.cpp:112:35: warning: unused variable ‘r’ [-Wunused-variable] short a[40],b[40],c[40],d[40],r[40],hn[40]; ^ user.cpp:109:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algebra2.in","r",stdin); ^ user.cpp:110:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algebra2.out","w",stdout); ^ user.cpp:111:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&n); ^