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19 lines
185 B

package main
func Fib(n int) int {
if n <= 0 {
return 0
}
t1 := 0
t2 := 1
for i := 2; i <= n; i++ {
t1 += t2
tmp := t1
t1 = t2
t2 = tmp
}
return t2
}
func main() {
}