力扣475.供暖器

• 二分答案

  • 排序之后双指针从前往后对每一个房子做判断

•   class Solution {public:int findRadius(vector<int>& houses, vector<int>& heaters) {int n = houses.size(),m = heaters.size();ranges::sort(houses);ranges::sort(heaters);auto check = [&](int r) -> bool{for(int i=0,j=0;i<n;i++){while(j<m && houses[i] > heaters[j] + r) j++;if(j<m && heaters[j] - r <= houses[i] && houses[i] <= heaters[j] + r) continue;return false;}return true; };int l = 0,r = (int)1e9;while(l<r){int mid = l + r >> 1;if(check(mid)) r = mid;else l = mid + 1;}return r;}};