查找算法——顺序查找

1、算法介绍

(1)遍历序列与查找值比较,相等返回所在下标

(2)未找到返回-1

2、代码实现

2.1、golang

package main

import (
	"fmt"
)

func main() {
	slice := []int{5, 3, 12, 54, 23, 12, 6, 9, 19}
	key := 54
	index := SearchSequential(slice, key)
	if index == -1 {
		fmt.Printf("%v不存在元素%v\n", slice, key)
	} else {
		fmt.Printf("%v位于%v下标为%v的位置。\n", key, slice, index)
	}
}

//顺序查找
func SearchSequential(slice []int, key int) int {
	n := len(slice)
	for i := 0; i < n; i++ {
		if slice[i] == key {
			return i
		}
	}
	return -1
}

2.2、python3

# 1、顺序查找
def search_sequential(arr, key):
    n = len(arr)
    for i in range(n):
        if arr[i] == key:
            return i
    return -1


if __name__ == '__main__':
    arr = [5, 3, 12, 54, 23, 12, 6, 9, 19]
    key = 54
    index = search_sequential(arr, key)
    if index == -1:
        print("%s不存在元素%s。" % (arr, key))
    else:
        print("%s位于%s下标为%s的位置。" % (key, arr, index))

vscode使用run code若有中文乱码解决方式:

"code-runner.executorMap": {
//...
  "python": "set PYTHONIOENCODING=utf8 && python -u",
//...
}
posted @ 2019-05-30 09:36  笃志弘毅  阅读(443)  评论(0编辑  收藏  举报