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算法練習,鏈表二分

har 插入排序 return val rep arch () cnblogs 二分

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;

public class BinarySearch {
    public static void main(String[] args) {
        int[] a = { 11, 27, 28, 33 };
        // System.out.println(findFirstRepeat("qywyer23tdd", 11));
        // ListNode head = LinkedListReverse.initialList();
        
// LinkedListReverse.printList(insertionSortList(head));[4,5,1,6,2,7,3,8],10 GetLeastNumbers_Solution(new int[] { 4, 5, 1, 6, 2, 7, 3, 8 }, 10); } public static ArrayList<Integer> GetLeastNumbers_Solution(int[] input, int k) { ArrayList<Integer> list = new ArrayList<Integer>();
int cnt = 0; if (k > input.length || k == 0) { return list; } while (cnt < k) { list.add(input[cnt]); cnt++; } Collections.sort(list); for (int i = k; i < input.length; i++) { int num = input[i];
// 如果超出最大,則不用管,如果沒有超出最大,則需要加入並踢出最大 if (num < list.get(k - 1)) { list.remove(k - 1); list.add(num); Collections.sort(list); } } System.out.println(list); return null; } /** * 插入排序 head 1 -> 7 -> 2 -> 6 -> 9 1 -> 2 -> 6 -> 7 -> 9 */ public static ListNode insertionSortList(ListNode head) { ListNode pstart = head; ListNode pcurr = head.next; if (pstart == null) { return null; } // //1 7 2 6 9 3 在7後面插入888 // do { // int currVal = pstart.val; // if (currVal == 7) { // ListNode newNode = new ListNode(888, null); // newNode.setNext(pstart.next); // pstart.setNext(newNode); // } // } while ((pstart = pstart.next) != null); // 1 7 2 6 9 3 在7前面插入888 do { int currVal = pcurr.val; if (currVal == 7) { ListNode newNode = new ListNode(888, null); newNode.setNext(pcurr); pstart.setNext(newNode); } } while ((pcurr = pcurr.next) != null); return head; } public static char findFirstRepeat(String A, int n) { HashSet<Character> hs = new HashSet<Character>(); for (char c : A.toCharArray()) { if (hs.contains(c)) { return c; } else { hs.add(c); } } return ‘ ‘; } public static int getPos(int[] A, int n, int val) { int start = 0; int end = n - 1; int mid = (end - start) / 2; while (start < end) { if (A[mid] == val) { return mid; } else if (A[mid] > val) { end = mid; } else if (A[mid] < val) { start = mid; } mid = start + (end - start) / 2; } return 0; } }

算法練習,鏈表二分