Compilare: user.cpp: In function ‘int main()’: user.cpp:88:32: warning: variable ‘last’ set but not used [-Wunused-but-set-variable] int N,K,i,j,l,inc=0,sf,P,t,last,st,dr,mid; ^ user.cpp:86:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ksecv.out","w",stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:24:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^