Compilare: user.cpp: In member function ‘bool Buffer::isDigit(char)’: user.cpp:36:22: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] return c >= '0' & c <= '9'; ^ user.cpp: In function ‘int main()’: user.cpp:136:39: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] Buffer cin("kthvalue.in",1024*1024); ^ user.cpp:151:68: warning: operation on ‘lEN’ may be undefined [-Wsequence-point] lTrie[++lEN] = lTrie[lEN-1]->Clone(v,1,lim); ^ user.cpp:156:68: warning: operation on ‘rEN’ may be undefined [-Wsequence-point] rTrie[++rEN] = rTrie[rEN-1]->Clone(v,1,lim); ^ user.cpp:137:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kthvalue.out","w",stdout); ^ user.cpp: In constructor ‘Buffer::Buffer(char*, long int)’: user.cpp:16:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(fileName,"r",stdin); ^ user.cpp: In member function ‘void Buffer::reFill()’: user.cpp:39:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(&Buff[0],1,maxBuf,stdin); pos = 0; ^