2021-03-17 12:50:45 +00:00
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2021-03-20 08:30:29 +00:00
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> 如果阅读时,发现错误,或者动画不可以显示的问题可以添加我微信好友 **[tan45du_one](https://raw.githubusercontent.com/tan45du/tan45du.github.io/master/个人微信.15egrcgqd94w.jpg)** ,备注 github + 题目 + 问题 向我反馈
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>
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> 感谢支持,该仓库会一直维护,希望对各位有一丢丢帮助。
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>
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2021-07-20 13:13:10 +00:00
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> 另外希望手机阅读的同学可以来我的 <u>[**公众号:袁厨的算法小屋**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u> 两个平台同步,想要和题友一起刷题,互相监督的同学,可以在我的小屋点击<u>[**刷题小队**](https://raw.githubusercontent.com/tan45du/test/master/微信图片_20210320152235.2pthdebvh1c0.png)</u>进入。
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2021-03-20 08:30:29 +00:00
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2021-03-20 07:48:03 +00:00
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#### [1052. 爱生气的书店老板](https://leetcode-cn.com/problems/grumpy-bookstore-owner/)
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2021-03-17 12:50:45 +00:00
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**题目描述**
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今天,书店老板有一家店打算试营业 customers.length 分钟。每分钟都有一些顾客(customers[i])会进入书店,所有这些顾客都会在那一分钟结束后离开。
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在某些时候,书店老板会生气。 如果书店老板在第 i 分钟生气,那么 grumpy[i] = 1,否则 grumpy[i] = 0。 当书店老板生气时,那一分钟的顾客就会不满意,不生气则他们是满意的。
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书店老板知道一个秘密技巧,能抑制自己的情绪,可以让自己连续 X 分钟不生气,但却只能使用一次。
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请你返回这一天营业下来,最多有多少客户能够感到满意的数量。
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示例:
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> 输入:customers = [1,0,1,2,1,1,7,5], grumpy = [0,1,0,1,0,1,0,1], X = 3
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> 输出:16
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解释:
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书店老板在最后 3 分钟保持冷静。
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感到满意的最大客户数量 = 1 + 1 + 1 + 1 + 7 + 5 = 16.
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2021-03-17 11:49:19 +00:00
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该题目思想就是,我们将 customer 数组的值分为三部分, leftsum, winsum, rightsum。我们题目的返回值则是三部分的最大和。
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注意这里的最大和,我们是怎么计算的。
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![](https://cdn.jsdelivr.net/gh/tan45du/test1@master/20210122/微信截图_20210223083057.1vns7wrs2z0.png)
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winsum 是窗口内的所有值,不管 grumpy[i] 的值是 0 还是 1,窗口的大小,就对应 K 的值,也就是老板的技能发动时间,该时间段内,老板不会生气,所以为所有的值。
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leftsum 是窗口左边区间的值,此时我们不能为所有值,只能是 grumpy[i] == 0 时才可以加入,因为此时不是技能发动期,老板只有在 grumpy[i] == 0 时,才不会生气。
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rightsum 是窗口右区间的值,和左区间加和方式一样。那么我们易懂一下窗口,我们的 win 值和 leftsum 值,rightsum 值是怎么变化的呢?
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见下图
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![](https://cdn.jsdelivr.net/gh/tan45du/test1@master/20210122/微信截图_20210223084549.5ht4nytfe1o0.png)
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我们此时移动了窗口,
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2021-07-20 13:13:10 +00:00
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则左半区间范围扩大,但是 leftsum 的值没有变,这时因为新加入的值,所对应的 grumpy[i] == 1,所以其值不会发生改变,因为我们只统计 grumpy[i] == 0 的值,
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2021-03-17 11:49:19 +00:00
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右半区间范围减少,rightsum 值也减少,因为右半区间减小的值,其对应的 grumpy[i] == 0,所以 rightsum -= grumpy[i]。
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winsum 也会发生变化, winsum 需要加上新加入窗口的值,减去刚离开窗口的值, 也就是 customer[left-1],left 代表窗口左边缘。
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好啦,知道怎么做了,我们直接开整吧。
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2021-04-26 06:54:12 +00:00
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Java Code:
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2021-03-17 11:49:19 +00:00
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```java
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class Solution {
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public int maxSatisfied(int[] customers, int[] grumpy, int X) {
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int winsum = 0;
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int rightsum = 0;
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int len = customers.length;
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//右区间的值
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for (int i = X; i < len; ++i) {
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if (grumpy[i] == 0) {
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rightsum += customers[i];
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}
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}
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//窗口的值
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2021-07-20 13:13:10 +00:00
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for (int i = 0; i < X; ++i) {
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winsum += customers[i];
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2021-03-17 11:49:19 +00:00
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}
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int leftsum = 0;
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//窗口左边缘
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int left = 1;
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//窗口右边缘
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int right = X;
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2021-07-20 13:13:10 +00:00
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int maxcustomer = winsum + leftsum + rightsum;
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2021-03-17 11:49:19 +00:00
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while (right < customers.length) {
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//重新计算左区间的值,也可以用 customer 值和 grumpy 值相乘获得
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if (grumpy[left-1] == 0) {
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leftsum += customers[left-1];
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}
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//重新计算右区间值
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if (grumpy[right] == 0) {
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rightsum -= customers[right];
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}
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//窗口值
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winsum = winsum - customers[left-1] + customers[right];
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//保留最大值
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maxcustomer = Math.max(maxcustomer,winsum+leftsum+rightsum);
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//移动窗口
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left++;
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right++;
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2021-07-20 13:13:10 +00:00
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}
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2021-03-17 11:49:19 +00:00
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return maxcustomer;
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}
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}
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```
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2021-04-26 06:54:12 +00:00
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Python3 Code:
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```py
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class Solution:
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def maxSatisfied(self, customers: List[int], grumpy: List[int], X: int) -> int:
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t = ans = sum(customers[:X]) + sum(map(lambda x: customers[X+x[0]] if x[1] == 0 else 0, enumerate(grumpy[X:])))
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for j in range(X, len(customers)):
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t += customers[j] * grumpy[j] - customers[j-X] * grumpy[j-X]
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ans = max(ans, t)
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return ans
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```
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2021-03-20 07:48:03 +00:00
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2021-07-17 04:13:15 +00:00
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Swift Code
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```swift
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class Solution {
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func maxSatisfied(_ customers: [Int], _ grumpy: [Int], _ minutes: Int) -> Int {
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let len = customers.count
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var winSum = 0, rightSum = 0, leftSum = 0
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// 右区间的值
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for i in minutes..<len {
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if grumpy[i] == 0 {
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rightSum += customers[i]
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}
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}
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// 窗口的值
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for i in 0..<minutes {
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winSum += customers[i]
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}
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var maxCustomer = winSum + leftSum + rightSum
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// 窗口左边缘
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var left = 1, right = minutes
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while right < len {
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// 重新计算左区间的值,也可以用 customer 值和 grumpy 值相乘获得
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if grumpy[left - 1] == 0 {
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leftSum += customers[left - 1]
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}
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// 重新计算右区间值
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if grumpy[right] == 0 {
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rightSum -= customers[right]
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}
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// 窗口值
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winSum = winSum - customers[left - 1] + customers[right]
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maxCustomer = max(maxCustomer, winSum + leftSum + rightSum) // 保留最大值
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// 移动窗口
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left += 1
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right += 1
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}
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2021-07-20 13:13:10 +00:00
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2021-07-17 04:13:15 +00:00
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return maxCustomer
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}
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}
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```
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2021-07-20 13:13:10 +00:00
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C++ Code
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```C++
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class Solution
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{
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public:
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int maxSatisfied(vector<int> &customers, vector<int> &grumpy, int minutes)
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{
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for_each(grumpy.begin(), grumpy.end(), [](auto &g){ g = !g; });
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vector<int> osum(customers.size(), 0);
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//先初始化第一个元素
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osum[0] = customers[0] * grumpy[0];
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//计算前缀和, osum是origin sum
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for (int i = 1; i < osum.size(); i++)
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{
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osum[i] = osum[i - 1] + customers[i] * grumpy[i];
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}
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//计算连续minutes的和
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vector<int> msum(customers.size() - minutes + 1, 0);
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for (int i = 0; i < minutes; i++)
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{
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msum[0] += customers[i];
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}
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for (int i = 1; i < msum.size(); i++)
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{
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msum[i] = msum[i - 1] - customers[i - 1] + customers[i + minutes - 1];
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}
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//分成三段计算
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int result = 0;
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for (int i = 0; i < msum.size(); i++)
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{
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//左 中 右
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//注意左的边界条件, 可以使用边界测试
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int sum = ((i - 1 >= 0) ? osum[i - 1] : 0) + msum[i] + osum[osum.size() - 1] - osum[i + minutes - 1];
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if (sum > result)
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result = sum;
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}
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return result;
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}
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};
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```
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