Compilare: user.cpp: In function ‘Reader& operator>>(Reader&, std::vector<int>&)’: user.cpp:107:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) { ^ user.cpp: In function ‘std::vector<int> computeHash(const std::vector<int>&)’: user.cpp:122:32: 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<int>&)’: user.cpp:136:45: 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:184:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < positions.size(); ++i) { ^ user.cpp:190:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = periodSize; i < differences.size(); i += periodSize) { ^ user.cpp:167:15: warning: unused variable ‘idx’ [-Wunused-variable] int N, P, idx = 0; ^