Compilare: main.cpp: In function 'void calc_hash(const string&, std::vector<long long int>&)': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < a.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'int calc_lcp(const std::vector<long long int>&, const std::vector<long long int>&)': main.cpp:27:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + pas < a.size() && i + pas < b.size() && a[i + pas] == b[i + pas]) ~~~~~~~~^~~~~~~~~~ main.cpp:27:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + pas < a.size() && i + pas < b.size() && a[i + pas] == b[i + pas]) ~~~~~~~~^~~~~~~~~~ main.cpp: In function 'bool cmp(const std::pair<std::__cxx11::basic_string<char>, std::vector<long long int> >&, const std::pair<std::__cxx11::basic_string<char>, std::vector<long long int> >&)': main.cpp:35:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return (l < a.first.size() && l < b.first.size() && a.first[l] < b.first[l]); ~~^~~~~~~~~~~~~~~~ main.cpp:35:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return (l < a.first.size() && l < b.first.size() && a.first[l] < b.first[l]); ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:39:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cli.in", "r", stdin); ^ main.cpp:40:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cli.out", "w", stdout); ^