Compilare: user.cpp: In function ‘void get()’: user.cpp:71:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[i].size() >= k) ans = max(ans, calc(s[i])); ^ user.cpp: In function ‘int main()’: user.cpp:78:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("kgraf.in", "r", stdin); ^ user.cpp:79:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kgraf.out", "w", stdout); ^