Compilare: user.cpp: In function ‘int main()’: user.cpp:219:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < w.size(); j++) ^ user.cpp:233:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == w.size() - 1) ^ user.cpp:148:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kinetic.in", "r", stdin); ^ user.cpp:149:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kinetic.out", "w", stdout); ^ user.cpp: In member function ‘char Reader::gChar()’: user.cpp:27:42: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, buffer, 1, stdin); ^