Compilare: user.cpp: In function ‘int main()’: user.cpp:24:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<x.size(); i++) ^ user.cpp:27:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<x.size(); i++) ^ user.cpp:22:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("puzzle.out", "w", stdout); ^ user.cpp:52:25: warning: ‘postag’ may be used uninitialized in this function [-Wmaybe-uninitialized] postag--; ^