Compilare: user.cpp: In function ‘int main()’: user.cpp:26:24: warning: unused variable ‘j’ [-Wunused-variable] int i,st[Nmax],top,j,sol=0; ^ user.cpp:26:26: warning: unused variable ‘sol’ [-Wunused-variable] int i,st[Nmax],top,j,sol=0; ^ user.cpp:27:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("supermario.in","r",stdin); ^ user.cpp:28:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("supermario.out","w",stdout); ^ user.cpp:29:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:31:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^