diff options
Diffstat (limited to 'Semestr 4/ask/lista5/zad3.c')
| -rw-r--r-- | Semestr 4/ask/lista5/zad3.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/Semestr 4/ask/lista5/zad3.c b/Semestr 4/ask/lista5/zad3.c new file mode 100644 index 0000000..1ce9067 --- /dev/null +++ b/Semestr 4/ask/lista5/zad3.c @@ -0,0 +1,60 @@ +#include <stdio.h> +#include <stdint.h> +#include <stdlib.h> + +uint32_t puzzle3(uint32_t n, uint32_t d); + +// uint32_t divv(uint32_t edi, uint32_t esi) { +// uint64_t rdi = edi; +// uint64_t rsi = esi; +// rsi <<= 32; +// uint8_t edx = 32; +// uint32_t ecx = 0x80000000; +// uint32_t eax = 0; +// L3: +// rdi += rdi; +// int64_t r8 = rdi; +// r8 -= rsi; +// if (r8 < 0) { +// goto L2; +// } +// eax |= ecx; +// rdi = r8; +// L2: +// ecx >>= 1; +// edx--; +// if (edx != 0) { +// goto L3; +// } +// return eax; +// } + +uint32_t decoded(uint32_t n, uint32_t d) { + uint64_t N = n; + uint64_t D = (uint64_t)d << 32; + + uint32_t bit = 0x80000000; + uint32_t result = 0; + for (uint32_t edx = 32; edx > 0; edx--) { + N += N; + if ((int64_t)(N - D) >= 0) { + result |= bit; + N -= D; + } + bit >>= 1; + } + return result; +} + +int main() { + for (uint32_t n=0; n <= 1000; ++n) { + for (uint32_t d=1; d <= 1000; ++d) { + if (puzzle3(n,d) != decoded(n, d)) { + printf("%d %d\n", n, d); + printf("%u %u\n", puzzle3(n, d), decoded(n, d)); + return 0; + } + } + } + printf("%d\n", puzzle3(1000000000, 2)); +}
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