Compilare: user.cpp: In function ‘int main()’: user.cpp:8:17: warning: unused variable ‘j’ [-Wunused-variable] int n,t,k,x,i,j,s1,st,dr,mid, ans; ^ user.cpp:6:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("br.in","r",stdin); ^ user.cpp:7:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("br.out","w",stdout); ^