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- #include <stdio.h>
- int Fib(int n)
- {
- int a1, a2=0, a3=1, i;
- if(n==1)
- {return 0;}
- else if(n<=2)
- {return 1;}
- for(i=3; i<=n; i++)
- {
- a1=a2;
- a2=a3;
- a3=a1+a2;
- }
- return a3;
- }
- int main()
- {
- printf("%d",Fib(6));
- return 0;
- }
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