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- #include <stdbool.h>
- #include <stdint.h>
- bool cifre_duplicate_hex(unsigned int n)
- {
- bool digits[16];
- for (size_t i = 0; i < 16; i++)
- digits[i] = false;
- while (n != 0)
- {
- if (digits[n & 0x0f])
- return true;
- digits[n & 0x0f] = true;
- n >>= 4;
- }
- return false;
- }
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