Compilare: user.cpp: In function ‘std::vector<long long int> computeHash(const std::vector<long long int>&)’: user.cpp:63:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < v.size(); ++i) { ^ user.cpp: In function ‘bool hasPeriod(int, const std::vector<long long int>&)’: user.cpp:88:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2 * periodSize; i < h.size(); i += periodSize) { ^ user.cpp: In function ‘int main()’: user.cpp:148:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < positions.size(); ++i) { ^ user.cpp:154:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = periodSize; i < differences.size(); i += periodSize) { ^ user.cpp:119:15: warning: unused variable ‘idx’ [-Wunused-variable] int N, P, idx = 0; ^