---
title: "餐厅"
created: 2025-11-28
tags:
  - 算法
---

# 餐厅

## 题目 [餐厅](https://www.acwing.com/problem/content/description/5388/)

![[image-a62eda3f.png]]

## 思路分析

![[image-576ca0f8.png]]

## 代码实现

```cpp
#include<bits/stdc++.h>
using namespace std;
#define endl '\n'

typedef long long LL;
const int N=2e5+10;
LL s[N];
int n,q;

int find(LL sum){
    int l=0,r=n;
    while(l<r){
        int m=l+r+1>>1;
        if(s[m]<=sum)   l=m;
        else    r=m-1;
    }
    return n-r;
}

int main()
{
    ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
    cin>>n>>q;
    for(int i=1;i<=n;i++){
        int x;cin>>x;
        s[i]=s[i-1]+x;
    }
    LL sum=0;
    while(q--){
        LL x;cin>>x;
        sum+=x;
        if(sum>=s[n])   sum=0;
        cout<<find(sum)<<endl;
    }
    return 0;
}
```

## 同类题型

## 视频讲解

- [[2-Learning/02-算法/03-刷题理模型/二分相关模型/餐厅|餐厅]]

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⬅️ [[2-Learning/02-算法/03-刷题理模型/前缀和与差分相关模型/前缀和/赶牛入圈|赶牛入圈]] 🏠 [[00-刷题理模型]] ➡️ [[前缀和与差分相关模型|前缀和与差分相关模型]]