Compilare: user.cpp: In function ‘int main()’: user.cpp:24:13: warning: unused variable ‘nrel’ [-Wunused-variable] int n=0,nrel=0,i,l,j,k,x; ^ user.cpp:22:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("randuri.in","r",stdin); ^ user.cpp:23:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("randuri.out","w",stdout); ^ /tmp/ccJp5mE8.o: In function `main': user.cpp:(.text.startup+0x75): warning: the `gets' function is dangerous and should not be used.