Compilare: user.cpp: In function ‘int second(int)’: user.cpp:24:7: warning: unused variable ‘y’ [-Wunused-variable] int y = bit_count(x); ^ user.cpp: In function ‘int main()’: user.cpp:140:23: warning: unused variable ‘k’ [-Wunused-variable] int total=1,i,t,q,k,answer=0; ^ user.cpp: In function ‘int opposite(int)’: user.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:138:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuburi.in","r",stdin); ^ user.cpp:139:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuburi.out","w",stdout); ^ user.cpp:141:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&limit); ^