Compilare: user.cpp: In function ‘int main()’: user.cpp:15:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,L,R,mid,sol=INF,x; ^ user.cpp:15:13: warning: unused variable ‘L’ [-Wunused-variable] int i,j,L,R,mid,sol=INF,x; ^ user.cpp:15:15: warning: unused variable ‘R’ [-Wunused-variable] int i,j,L,R,mid,sol=INF,x; ^ user.cpp:15:17: warning: unused variable ‘mid’ [-Wunused-variable] int i,j,L,R,mid,sol=INF,x; ^ user.cpp:17:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("date.in","r",stdin); ^ user.cpp:18:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("date.out","w",stdout); ^