Compilare: user.cpp: In function ‘void Add_hash()’: user.cpp:12:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Hash[List].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:31:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < Hash[i].size() ; ++j) ^ user.cpp:19:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pariuri.in", "r", stdin); ^ user.cpp:20:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pariuri.out", "w", stdout); ^ user.cpp:21:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:23:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ user.cpp:25:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &t); ^