Compilare: user.cpp: In function ‘int main()’: user.cpp:9:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,l,lmax; ^ user.cpp:9:15: warning: unused variable ‘l’ [-Wunused-variable] int n,i,j,l,lmax; ^ user.cpp:7:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("palalila2.in","r",stdin); ^ user.cpp:8:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("palalila2.out","w",stdout); ^ user.cpp:10:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccjxRPHf.o: In function `main': user.cpp:(.text.startup+0x5b): warning: the `gets' function is dangerous and should not be used.