Compilare: user.cpp: In member function ‘void Hash::remove(std::pair<int, int>)’: user.cpp:28:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < data[go].size(); i++) { ^ user.cpp: In member function ‘bool Hash::isIn(std::pair<int, int>)’: user.cpp:38:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < data[go].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:74:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banana.in","r",stdin); ^ user.cpp:75:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("banana.out","w",stdout); ^ user.cpp:77:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp:81:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^