Compilare: main.cpp: In function 'void almst(std::__cxx11::string)': main.cpp:5:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n.size(); i++) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n.size(); i++) { ~~^~~~~~~~~~ main.cpp:30:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("almst.in", "r", stdin); ^ main.cpp:31:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("almst.out", "w", stdout); ^