斐波那契数列那个题怎么做

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[mw_shl_code=c,true]int main()
{
int a,b,c,i,n;

scanf("%d",&n);
a=1;b=1;
for(i=3;<=n;i++)
{
c=a+b;
a=b;
b=c;
}
if(n<=2) printf("1");
else printf("%d",c);

return 0;
}[/mw_shl_code]