Compilare: user.cpp: In function ‘void get()’: user.cpp:65:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ord.size(); ++i) ^ user.cpp:69:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i; j < ord.size(); ++j) ^ user.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s[x].size() >= k) ans = max(ans, calc(s[x])), any = 1; ^ user.cpp: In function ‘int main()’: user.cpp:86:34: 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:87:35: 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); ^