If you understand the comments below, never will you make mistakes with binary search! thanks to A simple CPP solution with lower_bound and C++ O(logn) Binary Search that handles duplicate, thanks to phu1ku 's answer on the second post. http://en.cpp…
Bound Found Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 4056   Accepted: 1249   Special Judge Description Signals of most probably extra-terrestrial origin have been received and digitalized by The Aeronautic and Space Administration…
Binary Tree Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6355   Accepted: 2922 Description Background Binary trees are a common data structure in computer science. In this problem we will look at an infinite binary tree where the node…
#include <cstdio> #include <cstdlib> #include <climits> #include <cstring> #include <algorithm> using namespace std; int map[1015][1015]; void update(int x,int y, int n) { for(int i=x;i<=1005;i+=(i&(-i))) { for(int j=y…
#include<iostream> #include<cstring> #include<cstdio> using namespace std; int n, m; int num[100005]; int front(int x) { return x&(-x); } int update(int x,int k) { while(x<=n) { num[x]+=k; x+=front(x); } return 1; } int sum(int x)…
二叉查找树简介 二叉查找树(Binary Search Tree), 也成二叉搜索树.有序二叉树(ordered binary tree).排序二叉树(sorted binary tree), 是指一棵空树或者具有下列性质的的二叉树: 1. 若任意节点的左子树不空,在左子树上所有结点的值均小于或等于它的根结点的值: 2. 任意节点的右子树不空,则右子树上所有结点的值均大于它的根结点的值: 3. 任意节点的左子树.右子树也分别为二叉查找树. 4. 没有键值相等的结点(no duplicate no…
Given n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example,Given n = 3, your program should return all 5 unique BST's shown below. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 / / \ \ 2 1 2 3 confused what "{1,#,2…
96. Unique Binary Search Trees https://www.cnblogs.com/grandyang/p/4299608.html 3由dp[1]*dp[1].dp[0]*dp[2].dp[2]*dp[0]相加而成 从2开始 class Solution { public: int numTrees(int n) { vector<); dp[] = ; dp[] = ; ;i <= n;i++){ ;j < i;j++){ dp[i] += dp[j] *…
1. 问题引入 最近参选了学堂在线的课程数据结构(2015秋).课程由清华大学的邓俊辉老师主讲,在完成课后作业时,遇到了这样一个题目范围查询.在这个题目中,我需要解决这样一个子问题:给定了一组已经排好序的整数集合A[0...n]和一组闭区间[L,R],求这个整数集合中落在这个区间中的点的个数.解决这个问题,我们很容易想到查找效率很高的二分查找,但是这又不是一般求key是否在一个数组里面的二分查找问题.对于区间左端点L,要找到数组里面大于或等于它的最小的元素的下标indexL.对于区间右端点R,要…
http://poj.openjudge.cn/practice/C18H 题目 算平均数用到公式\[\bar{x}=\frac{x_1+x_2+x_3+\cdots+x_n}{n}\] 但如果用int型计算,那么\(x_1+x_2+x_3+\cdots+x_n\)可能会超过\(2^{31}-1\) 算6个数的平均数可以这么算 Calculate the average of\(x_1,x_2,x_3\)\[\bar{x}_1=\frac{x_1+x_2+x_3}{3}\]Calculate t…