Compilare: user.cpp: In function ‘int main()’: user.cpp:57:13: warning: unused variable ‘l’ [-Wunused-variable] int i,j,l; ^ user.cpp:61:14: warning: unused variable ‘nr2’ [-Wunused-variable] numar nr,nr2; ^ user.cpp:58:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm.in","r",stdin); ^ user.cpp:59:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("perm.out","w",stdout); ^ user.cpp:60:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^