Compilare: user.cpp:5:20: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define BUF_SIZE 1 << 14 ^ user.cpp:39:15: note: in expansion of macro ‘BUF_SIZE’ char bufw[1 + BUF_SIZE]; ^ user.cpp: In function ‘int main()’: user.cpp:91:23: warning: variable ‘ans’ set but not used [-Wunused-but-set-variable] long long ans = INF; ^ user.cpp: In function ‘char nextch()’: user.cpp:11:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^