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- unsigned long long fib(unsigned n)
- {
- if(n == 0) return 0;
- auto f0 = 0ull, f1 = 1ull;
- while(--n)
- {
- auto f0o = f0;
- auto f1o = f1;
- f0 = f1o;
- f1 = f0o + f1o;
- }
- return f1;
- }
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