LeetCode475. Heaters

文章目录

一、题目

Winter is coming! During the contest, your first job is to design a standard heater with a fixed warm radius to warm all the houses.

Every house can be warmed, as long as the house is within the heater's warm radius range.

Given the positions of houses and heaters on a horizontal line, return the minimum radius standard of heaters so that those heaters could cover all houses.

Notice that all the heaters follow your radius standard, and the warm radius will the same.

Example 1:

Input: houses = [1,2,3], heaters = [2]

Output: 1

Explanation: The only heater was placed in the position 2, and if we use the radius 1 standard, then all the houses can be warmed.

Example 2:

Input: houses = [1,2,3,4], heaters = [1,4]

Output: 1

Explanation: The two heaters were placed at positions 1 and 4. We need to use a radius 1 standard, then all the houses can be warmed.

Example 3:

Input: houses = [1,5], heaters = [2]

Output: 3

Constraints:

1 <= houses.length, heaters.length <= 3 * 104

1 <= houses[i], heaters[i] <= 109

二、题解

双指针,i和j分别从houses和heaters的索引从左向右移动。

cpp 复制代码
class Solution {
public:
    int findRadius(vector<int>& houses, vector<int>& heaters) {
        sort(houses.begin(),houses.end());
        sort(heaters.begin(),heaters.end());
        int res = 0;
        for(int i = 0,j = 0;i < houses.size();i++){
            while(!best(houses,heaters,i,j)) j++;
            res = max(res,abs(houses[i]-heaters[j]));
        }
        return res;
    }
    bool best(vector<int>& houses,vector<int>& heaters,int i,int j){
        if(j == heaters.size() - 1) return true;
        else if(abs(houses[i]-heaters[j]) < abs(houses[i]-heaters[j + 1])) return true;
        else return false;
    }
};
相关推荐
生态遥感监测笔记10 分钟前
GEE利用已有土地利用数据选取样本点并进行分类
人工智能·算法·机器学习·分类·数据挖掘
Tony沈哲39 分钟前
macOS 上为 Compose Desktop 构建跨架构图像处理 dylib:OpenCV + libraw + libheif 实践指南
opencv·算法
刘海东刘海东1 小时前
结构型智能科技的关键可行性——信息型智能向结构型智能的转变(修改提纲)
人工智能·算法·机器学习
胖大和尚2 小时前
clang 编译器怎么查看在编译过程中做了哪些优化
c++·clang
pumpkin845142 小时前
Rust 调用 C 函数的 FFI
c语言·算法·rust
挺菜的2 小时前
【算法刷题记录(简单题)003】统计大写字母个数(java代码实现)
java·数据结构·算法
mit6.8242 小时前
7.6 优先队列| dijkstra | hash | rust
算法
2401_858286112 小时前
125.【C语言】数据结构之归并排序递归解法
c语言·开发语言·数据结构·算法·排序算法·归并排序
钱彬 (Qian Bin)3 小时前
一文掌握Qt Quick数字图像处理项目开发(基于Qt 6.9 C++和QML,代码开源)
c++·开源·qml·qt quick·qt6.9·数字图像处理项目·美观界面
guygg883 小时前
基于matlab的FIR滤波器
开发语言·算法·matlab