Given ann x nmatrixwhere each of the rows and columns is sorted in ascending order, returnthekthsmallest element inthe matrix. Note that it is thekthsmallest elementin the sorted order, not thekthdistinctelement. You must find a solution with complexity better thanO(n2). Example 1: Input: ...
这里我们做类似的事情,每当matrix[row][0]小于堆顶元素时,我们就将整个一行都推到heap里面。还是要注意heap里需要预存一个MaxInt,否则可能出现pop空堆的情况。 1classSolution(object):2defkthSmallest(self, matrix, k):3"""4:type matrix: List[List[int]]5:type k: int6:rtype: int7"""8ans =[]...
};classSolution {public:intkthSmallest(vector<vector<int> >& matrix,intk) {intlen=matrix.size();boolinheap[1000][1000]; memset(inheap,0,sizeof(inheap)); priority_queue<Node>heap; heap.push(Node(0,0,matrix[0][0]));for(inti=0; i<k-1; i++) { Node now=heap.top();if(now....
public int compare(Element e1, Element e2){ return e1.val - e2.val; } }); //use a hashset to check if the element has been visited Set<Integer> visited = new HashSet<Integer>(); //offer the smallest element in the matrix to the minHeap first minHeap.offer(new Element(matrix[0...
【Leetcode】Kth Smallest Element in a Sorted Matrix https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/ 题目: n x n Note that it is the kth smallest element in the sorted order, not the kth distinct element. Example:...
题目描述: LeetCode 378. Kth Smallest Element in a Sorted Matrix Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth smallest element in the sorted or
Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. Note: You may assume k is always valid, 1 ≤ k ≤ BST's total elements. Exampl...Leetcode - Kth Smallest Element in a Sorted Matrix My code: 这道题目直接拿 map-heap 来解了。感觉效...
publicclassSolution{publicintkthSmallest(int[][]matrix,int k){if(matrix.length==0||matrix[0].length==0)return0;int[]index=newint[matrix.length];int pos=0;int small=matrix[matrix.length-1][matrix[0].length-1];;for(;k>0;k--){small=matrix[matrix.length-1][matrix[0].length-1];fo...
Leetcode 230 Kth Smallest Element in a BST 思路 由于bst的中序遍历可以得到一个升序的序列,因此对bst进行中序遍历并记录已经遍历过的数字,当遍历过count==k-1时(count初始为0),说明现在正在遍历的是第k小的数字,保存起来等到最后返回即可。 小技巧 需要注意的是在java的值传递方式,将count和result放到数组...
Given a binary search tree, write a function kthSmallest to find the kth smallest element in it. (1 ≤ k ≤ BST’s total elements) Java Solution 1 – Inorder Traversal We can inorder traverse the tree and get the kth smallest element. Time is O(n). ...