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// @Title: 斐波那契数 (Fibonacci Number)
// @Author: 15816537946@163.com
// @Date: 2021-01-04 11:36:45
// @Runtime: 0 ms
// @Memory: 1.9 MB
func fib(n int) int {
	if n < 2 {
		return n
	}

	var j int
	ret := 1
	for i := 2; i <= n; i++ {
		ret, j = ret+j, ret
	}
	return ret

}