Compilare: user.cpp: In function ‘int main()’: user.cpp:37:19: warning: unused variable ‘a’ [-Wunused-variable] int t,i,j,k,l,a,b,c,d; ^ user.cpp:37:21: warning: unused variable ‘b’ [-Wunused-variable] int t,i,j,k,l,a,b,c,d; ^ user.cpp:37:23: warning: unused variable ‘c’ [-Wunused-variable] int t,i,j,k,l,a,b,c,d; ^ user.cpp:37:25: warning: unused variable ‘d’ [-Wunused-variable] int t,i,j,k,l,a,b,c,d; ^ user.cpp:35:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bigfour.in","r",stdin); ^ user.cpp:36:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bigfour.out","w",stdout); ^ user.cpp:38:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:41:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d",&limit,&v[0],&v[1],&v[2],&v[3]); ^