1 引言 Intro之前已经介绍过一种经典且名声在外的排序算法叫“冒泡排序 bubble sort”,今天在翻算法书的时候,不小心又看到了一种叫“选择排序 selection sort”的算法。 哥一眼扫过去,就知道这算法和冒泡排序都…
1、定义 选择排序(Selection Sort)的基本思想是:每一趟从待排序的记录中选出关键字最小的记录,顺序放在已排好序的子文件的最后,直到全部记录排序完毕。 常用的选择排序方法有直接选择排序和堆排序。 2、基本思想 n个记录的文件的直接选择排序可经过n-1趟直接选择排序得到有序结果: ① 初始状态:无序区为R[1.....
template<typename T>//泛型voidselectionSort(T arr[],intn){//数组arr 个数nfor(inti=0;i<n;i++){//寻找[i,n)区间里的最小值intminIndex =i;for(intj = i+1;j<n;j++){if(arr[j] <arr[minIndex])//minIndex 中储存最小元素的下标minIndex =j; swap(arr[i], arr[minIndex]); } }...
sort(S.begin(), S.end()); vector distances(N); for (int i = 0; i < N; i++) { distances[i] = S[i].first - S[i].second; } vector visited(N, false); int max_visited = 0; int cur_visited = 0; for (int i = 0; i < N; i++) { ...
leetcode官方快速选择算法图示 快速选择算法代码 //用于数组两个位置之间数据交换voidswap(vector<int>&arr,inta,intb){inttemp=arr[b];arr[b]=arr[a];arr[a]=temp;}//划分算法//返回基数划分后所在的下标intpartition(intleft,intright,intpivot_index,vector<int>&arr){intpivot=arr[pivot_index];swap(...
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Second, it also keeps the most frequently used contents in the cache by applying some sort of priority. Several eviction policies were proposed in the past [9,19–25]. Some of the most popular eviction policies include First in First out (FIFO), Random Replacement (RR), Least Recently ...
Firstly, according to the descending sort order of the features based on their important degree, the feature is added to the selected feature subset Q one by one. Subset Q is used as the input vector of RF to retrain a classifier when a new feature is added, and the classification ...