(Harika) golflere yanıt olarak orlp
:
Doğruluk önce gelmelidir
- Bunların çoğu bazı tamsayı türleri için parçalanır. Bu, OP'nin sürümünü içerir
- İlginçtir, onlar için çalışırlar
int16_t
- bu yüzden varsayım vardır. Muhtemelen bit kaymaları 32 bit ints için +16'ya ihtiyaç duyacaktır (bu günlerde hemen hemen her yerde). Bu onları bir karakter daha büyük yapar ...
(x>3) && (x > y+1)
Yazmanın tek "doğru" yolu IMO'dur x>3&x>y+1
(9 karakter).
(Gerçekten imzasız-lık C ++ ifadelerde "bulaşıcı" olduğunu, özellikle de göz önüne (büyük) imzasız türleri olasılığını almak gerekir. Ben uygun olan bu "tespit" varsayalım static_cast<>
s tür amacı yenmek ...)
GÜNCELLEME
Aşağıdaki testlerle hangi ifadelerin gerçekten güvenilir bir şekilde çalıştığını anlayabildim :
Live On Coliru
#define REPORT(caption, expr) do {\
do_report(caption, [](T x, T y) -> bool { return (expr); }, #expr); } while (false)
template <typename T> struct driver {
static void run() {
std::cout << "\n" << __PRETTY_FUNCTION__ << "\n";
// the only two correct implementations:
REPORT("MASTER" , (x>3) && (x>y+1));
REPORT("GOLF" , x>3&x>y+1);
REPORT("lookup" , "000000000000000000000000111000111100"[x*6+y]-'0');
// failing sometimes:
REPORT("question", (x>3)&(x-y>1));
REPORT("orlp0" , x>3&x-y>1);
REPORT("orlp2" , ~y+x>2>>y);
REPORT("orlp3" , x*x-y*y>9);
REPORT("orlp4" , ~y>x/~3*x);
REPORT("orlp5" , -3>>y>y-x);
REPORT("orlp6" , ~y+x<<y>2);
// failing always
REPORT("orlp1" , -x<~y>4>x);
}
private:
static void do_report(std::string const& caption, bool (*f)(T,T), char const* expression) {
std::string r;
for (T x = 0; x < 6; ++x) for (T y = 0; y < 6; ++y) r += f(x, y)?'1':'0';
bool const correct = "000000000000000000000000111000111100" == r;
std::cout << (correct?"OK\t":"ERR\t") << r << "\t" << caption << "\t" << expression << "\n";
}
};
int main() {
driver<int8_t>::run();
driver<int16_t>::run();
driver<int32_t>::run();
driver<int64_t>::run();
driver<uint8_t>::run();
driver<uint16_t>::run();
driver<uint32_t>::run();
driver<uint64_t>::run();
}
Coliru çıktı, burada referans için:
static void driver<T>::run() [with T = signed char]
OK 000000000000000000000000111000111100 MASTER (x>3) && (x>y+1)
OK 000000000000000000000000111000111100 GOLF x>3&x>y+1
OK 000000000000000000000000111000111100 lookup "000000000000000000000000111000111100"[x*6+y]-'0'
OK 000000000000000000000000111000111100 question (x>3)&(x-y>1)
OK 000000000000000000000000111000111100 orlp0 x>3&x-y>1
OK 000000000000000000000000111000111100 orlp2 ~y+x>2>>y
OK 000000000000000000000000111000111100 orlp3 x*x-y*y>9
OK 000000000000000000000000111000111100 orlp4 ~y>x/~3*x
OK 000000000000000000000000111000111100 orlp5 -3>>y>y-x
OK 000000000000000000000000111000111100 orlp6 ~y+x<<y>2
ERR 000000000000000000000000000000000000 orlp1 -x<~y>4>x
static void driver<T>::run() [with T = short int]
OK 000000000000000000000000111000111100 MASTER (x>3) && (x>y+1)
OK 000000000000000000000000111000111100 GOLF x>3&x>y+1
OK 000000000000000000000000111000111100 lookup "000000000000000000000000111000111100"[x*6+y]-'0'
OK 000000000000000000000000111000111100 question (x>3)&(x-y>1)
OK 000000000000000000000000111000111100 orlp0 x>3&x-y>1
OK 000000000000000000000000111000111100 orlp2 ~y+x>2>>y
OK 000000000000000000000000111000111100 orlp3 x*x-y*y>9
OK 000000000000000000000000111000111100 orlp4 ~y>x/~3*x
OK 000000000000000000000000111000111100 orlp5 -3>>y>y-x
OK 000000000000000000000000111000111100 orlp6 ~y+x<<y>2
ERR 000000000000000000000000000000000000 orlp1 -x<~y>4>x
static void driver<T>::run() [with T = int]
OK 000000000000000000000000111000111100 MASTER (x>3) && (x>y+1)
OK 000000000000000000000000111000111100 GOLF x>3&x>y+1
OK 000000000000000000000000111000111100 lookup "000000000000000000000000111000111100"[x*6+y]-'0'
OK 000000000000000000000000111000111100 question (x>3)&(x-y>1)
OK 000000000000000000000000111000111100 orlp0 x>3&x-y>1
OK 000000000000000000000000111000111100 orlp2 ~y+x>2>>y
OK 000000000000000000000000111000111100 orlp3 x*x-y*y>9
OK 000000000000000000000000111000111100 orlp4 ~y>x/~3*x
OK 000000000000000000000000111000111100 orlp5 -3>>y>y-x
OK 000000000000000000000000111000111100 orlp6 ~y+x<<y>2
ERR 000000000000000000000000000000000000 orlp1 -x<~y>4>x
static void driver<T>::run() [with T = long int]
OK 000000000000000000000000111000111100 MASTER (x>3) && (x>y+1)
OK 000000000000000000000000111000111100 GOLF x>3&x>y+1
OK 000000000000000000000000111000111100 lookup "000000000000000000000000111000111100"[x*6+y]-'0'
OK 000000000000000000000000111000111100 question (x>3)&(x-y>1)
OK 000000000000000000000000111000111100 orlp0 x>3&x-y>1
OK 000000000000000000000000111000111100 orlp2 ~y+x>2>>y
OK 000000000000000000000000111000111100 orlp3 x*x-y*y>9
OK 000000000000000000000000111000111100 orlp4 ~y>x/~3*x
OK 000000000000000000000000111000111100 orlp5 -3>>y>y-x
OK 000000000000000000000000111000111100 orlp6 ~y+x<<y>2
ERR 000000000000000000000000000000000000 orlp1 -x<~y>4>x
static void driver<T>::run() [with T = unsigned char]
OK 000000000000000000000000111000111100 MASTER (x>3) && (x>y+1)
OK 000000000000000000000000111000111100 GOLF x>3&x>y+1
OK 000000000000000000000000111000111100 lookup "000000000000000000000000111000111100"[x*6+y]-'0'
OK 000000000000000000000000111000111100 question (x>3)&(x-y>1)
OK 000000000000000000000000111000111100 orlp0 x>3&x-y>1
OK 000000000000000000000000111000111100 orlp2 ~y+x>2>>y
OK 000000000000000000000000111000111100 orlp3 x*x-y*y>9
OK 000000000000000000000000111000111100 orlp4 ~y>x/~3*x
OK 000000000000000000000000111000111100 orlp5 -3>>y>y-x
OK 000000000000000000000000111000111100 orlp6 ~y+x<<y>2
ERR 000000000000000000000000000000000000 orlp1 -x<~y>4>x
static void driver<T>::run() [with T = short unsigned int]
OK 000000000000000000000000111000111100 MASTER (x>3) && (x>y+1)
OK 000000000000000000000000111000111100 GOLF x>3&x>y+1
OK 000000000000000000000000111000111100 lookup "000000000000000000000000111000111100"[x*6+y]-'0'
OK 000000000000000000000000111000111100 question (x>3)&(x-y>1)
OK 000000000000000000000000111000111100 orlp0 x>3&x-y>1
OK 000000000000000000000000111000111100 orlp2 ~y+x>2>>y
OK 000000000000000000000000111000111100 orlp3 x*x-y*y>9
OK 000000000000000000000000111000111100 orlp4 ~y>x/~3*x
OK 000000000000000000000000111000111100 orlp5 -3>>y>y-x
OK 000000000000000000000000111000111100 orlp6 ~y+x<<y>2
ERR 000000000000000000000000000000000000 orlp1 -x<~y>4>x
static void driver<T>::run() [with T = unsigned int]
OK 000000000000000000000000111000111100 MASTER (x>3) && (x>y+1)
OK 000000000000000000000000111000111100 GOLF x>3&x>y+1
OK 000000000000000000000000111000111100 lookup "000000000000000000000000111000111100"[x*6+y]-'0'
ERR 000000000000000000000000111001111100 question (x>3)&(x-y>1)
ERR 000000000000000000000000111001111100 orlp0 x>3&x-y>1
ERR 111111011111001111000111111011111101 orlp2 ~y+x>2>>y
ERR 011111001111000111000011111001111100 orlp3 x*x-y*y>9
ERR 111111111111111111111111111111111111 orlp4 ~y>x/~3*x
ERR 111111011111001111000111111011111101 orlp5 -3>>y>y-x
ERR 111111011111001111000111111011111101 orlp6 ~y+x<<y>2
ERR 000000000000000000000000000000000000 orlp1 -x<~y>4>x
static void driver<T>::run() [with T = long unsigned int]
OK 000000000000000000000000111000111100 MASTER (x>3) && (x>y+1)
OK 000000000000000000000000111000111100 GOLF x>3&x>y+1
OK 000000000000000000000000111000111100 lookup "000000000000000000000000111000111100"[x*6+y]-'0'
ERR 000000000000000000000000111001111100 question (x>3)&(x-y>1)
ERR 000000000000000000000000111001111100 orlp0 x>3&x-y>1
ERR 111111011111001111000111111011111101 orlp2 ~y+x>2>>y
ERR 011111001111000111000011111001111100 orlp3 x*x-y*y>9
ERR 111111111111111111111111111111111111 orlp4 ~y>x/~3*x
ERR 111111011111001111000111111011111101 orlp5 -3>>y>y-x
ERR 111111011111001111000111111011111101 orlp6 ~y+x<<y>2
ERR 000000000000000000000000000000000000 orlp1 -x<~y>4>x
özet
Bu, kaynak kod öğelerini tekrarlamanın "maliyeti" hakkında olduğundan, bir arama tablosu kullanabilirsiniz. Arama tablosunu "gizleyebilirsiniz", bu nedenle
LUT[x][y]
veya
LUT[x*6+y]
Tabii ki bilgiçlik dolu ve geniş olabilir ve LUT'u yeniden adlandırabilirsiniz
L[x][y]
Yani "versiyonum" ... 7 karakter . (Veya bir işlev yaparsanız ve L(x,y)
hatta daha kısa).
Veya daha da önemlisi: doğru, test edilebilir ve bakımı yapılabilir.