Compilare: user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:30:38: 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); ^ user.cpp: In function ‘int main()’: user.cpp:186:18: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol++; ^ user.cpp:187:45: warning: ‘id’ may be used uninitialized in this function [-Wmaybe-uninitialized] id = upper_bound(x+id,x+n+1,x[id]+d) - x; ^