Compilare: user.cpp: In member function ‘void LongestCommonSubsequence::Calculate()’: user.cpp:26:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < first_.size(); ++i) ^ user.cpp:27:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < second_.size(); ++j) { ^ user.cpp: In function ‘int main()’: user.cpp:79:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.in","r",stdin); ^ user.cpp:80:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.out","w",stdout); ^ user.cpp:83:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &num_values_first, &num_values_second); ^ user.cpp:87:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &first[i]); ^ user.cpp:90:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &second[i]); ^