Compilare: user.cpp: In function ‘int main()’: user.cpp:28:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k; ^ user.cpp:31:9: warning: unused variable ‘w’ [-Wunused-variable] int w,p,nrp,nrmax,prec=0; ^ user.cpp:31:11: warning: unused variable ‘p’ [-Wunused-variable] int w,p,nrp,nrmax,prec=0; ^ user.cpp:33:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ruksak.in","r",stdin); ^ user.cpp:34:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ruksak.out","w",stdout); ^ user.cpp:36:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&g); ^ user.cpp:40:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hu%hu",&rock[i].w,&rock[i].p); ^