Compilare: user.cpp: In function ‘void add_hash(int, int)’: user.cpp:23:64: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int k = 0; k < Hash[(hash1 * 1LL * hash2) % MOD].size(); k ++ ) { ^ user.cpp: In function ‘bool solve(int)’: user.cpp:85:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < Hash[i].size(); i ++ ) { ^ user.cpp: In function ‘int main()’: user.cpp:98:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "poze.in" , "r", stdin ); ^ user.cpp:99:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "poze.out", "w", stdout ); ^ user.cpp:101:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &T ); ^ user.cpp:103:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d %d %d", &N, &M, &K ); ^ user.cpp:107:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &A[i][j] ); ^