Compilare: user.cpp: In function ‘int find_time(int)’: user.cpp:14:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < List[X % MOD].size(); i ++ ) { ^ user.cpp: In function ‘void update_time(int, int)’: user.cpp:24:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < List[X % MOD].size(); i ++ ) { ^ user.cpp: In function ‘int main()’: user.cpp:58:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < List[i].size(); j ++ ) ^ user.cpp:36:42: 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:37:42: 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:39:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &N ); ^ user.cpp:41:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &M ); ^ user.cpp:44:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d", &X, &Y ); ^