Compilare: user.cpp: In function ‘void next()’: user.cpp:10:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir,1,dim,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:69:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaje.in","r",stdin); ^ user.cpp:70:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaje.out","w",stdout); ^ user.cpp: In function ‘void query(int, int, int, int, int)’: user.cpp:55:44: warning: ‘mij’ may be used uninitialized in this function [-Wmaybe-uninitialized] else query(nod*2+1,mij+1,dr,x,y); ^