How to use arrays in PHP to solve the monkey eating peach problem

php uses an array to solve the monkey eating peach problem: use the function "monkeyEatPeach()" to receive a parameter n, indicating the initial number of peaches, store n in the array, and then enter the loop, through "end( $peachArr)" to get the last element in the array, which is the current number of peaches, use the "floor" function to find half the number of peaches, and then subtract 1 to get the new number of peaches. If the new number of peaches is 0, it means that the peaches have been eaten and the loop is exited.

#The operating environment of this tutorial: Windows 10 system, php8.1.3 version, Dell g3 computer.

PHP is a programming language widely used in Web development. In programming, arrays are a very important data structure in PHP. This article will introduce how to use arrays to solve the famous monkey eating peach problem.

Problem description:

There was a monkey who picked a bunch of peaches and placed them next to the pile. It would eat half of them every day, and then eat one more. Suppose there are n peaches initially. How many days will it take for this pile of peaches to be eaten? Let’s say the monkey is the ultimate foodie and won’t stop just because he’s finished eating the peach.

Problem-solving ideas:

We can use arrays to simulate this process. Initially, the number of peaches n is stored in an array, and then a loop is used to simulate the process of the monkey eating peaches every day until all the peaches are eaten.

Specific implementation:

<?php
function monkeyEatPeach($n){
$peachArr = array($n); // 初始化桃子数量
$i = 1; // 记录经过的天数
while(true){
$peach = end($peachArr); // 取出数组中的最后一个元素
$half = floor($peach / 2); // 吃掉一半
$newPeach = $half - 1; // 再多吃一个
// 如果桃子数量为0，则退出循环
if($newPeach == 0){
break;
}
array_push($peachArr, $newPeach); // 将新的桃子数量加入数组中
$i++; // 天数加一
}
return $i; // 返回经过的天数
}
// 测试
$days = monkeyEatPeach(10);
echo "经过{$days}天，桃子被吃完！";
?>

The function `monkeyEatPeach()` in the above code receives a parameter n, which represents the initial number of peaches. First, store the initial number of peaches n into the array, then enter the loop and use `end($peachArr)` to get the last element in the array, which is the current number of peaches. Every day, the monkey eats half of the peaches and one more. Use the floor function to find the number of half peaches, and then subtract 1 to get the new number of peaches. If the new number of peaches is 0, it means that the peaches have been eaten and the loop is exited.

Finally, test the situation where the initial number of peaches is 10 and output the number of days that have passed to get the answer.

Through the above analysis, we can draw the conclusion: given the initial number of peaches n, after days, the peaches will be eaten. Arrays can be used to solve the problem of monkeys eating peaches.

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