Compilare: main.cpp: In function 'bool cmp(std::__cxx11::string, std::__cxx11::string)': main.cpp:13:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size (); i++) ~~^~~~~~~~~~~ main.cpp: In function 'bool inside(std::__cxx11::string, std::__cxx11::string)': main.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size (); i++) { ~~^~~~~~~~~~~ main.cpp:27:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return j == b.size (); ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:31:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("interesant.in", "r", stdin); ^ main.cpp:32:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("interesant.out", "w", stdout); ^