题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5183 Negative and Positive (NP) Description When given an array $\left( {{a_0},{a_1},{a_2}, \cdots {a_{n - 1}}} \right)$ and an integer $K$, you are expected to judge whether there is a pair $(i,j)\ (0 \…
Negative and Positive (NP) Time Limit: 3000/1500 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 2177 Accepted Submission(s): 556 Problem Description When given an array (a0,a1,a2,⋯an−1) and an integer K, you are…
题目链接:HDU 5183 Problem Description When given an array \((a_0,a_1,a_2,⋯a_{n−1})\) and an integer \(K\), you are expected to judge whether there is a pair \((i,j)(0≤i≤j<n)\) which makes that \(NP−sum(i,j)\) equals to \(K\) true. Here \(NP−sum(i,j)=a_i−…
学到了以邻接表方式建立的hashmap 题意:给你一串数a和一个数k,都有正有负,问知否能找到一对数(i,j)(i<=j)保证a [i] - a [i+1] + a [i+2] - a [i+3]........(-1)^(j-i) a[j] 等于k 题解:想了很久才想出一个方法就是:记录前缀和,利用前缀和可以求所有可能性:对于每次求前缀和psum,psum[i]及其psum[i]-psum[比i小的](就是减去之前每次求出的前缀和)组成的小于n*n/2个数字就是总的可能出现的数(当然要处理一下…
题意: When given an array (a0,a1,a2,⋯an−1) and an integer K, you are expected to judge whether there is a pair (i,j)(0≤i≤j<n) which makes that NP−sum(i,j) equals to K true. Here NP−sum(i,j)=ai−ai+1+ai+2+⋯+(−1)j−iaj 1≤n≤1000000,−1000000000≤ai≤1000000000…
2014多校第一题,当时几百个人交没人过,我也暴力交了几发,果然不行. 比完了去学习了BSGS才懂! 题目:http://acm.hdu.edu.cn/showproblem.php?pid=4887 Endless Punishment Time Limit: 30000/15000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 52 Accepted Submissi…
pat 1145: 参考链接 Quadratic probing (with positive increments only) is used to solve the collisions.:平方探测法解决冲突 哈希表:H(key)求余数.二次平方探测法解决冲突.求平均查找长度AVL = 所有次数和/n 需要注意点:处理冲突统计查找次数时,如果查找到哈希表最后一个也失败了,那么次数要+1. #include<bits/stdc++.h> using namespace std; /* 哈希…
The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute how many quadruplet (a, b, c, d) ∈ A × B × C × D are such that a + b + c + d = . In the following, we assume that all lists have the same size n. Inp…
Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, where index1 must be less than index2. Please note that…
