给定五个集合.问是否能从五个集合各取一个元素,使得元素之和为0. 这道题有两种做法,一种是哈希,然而之前没写过哈希.....比赛后从大神那copy了一份. 这里说还有一种. 对于这五个集合分为三组.1,2组求和为一组,3,4组求和分为一组,5为一组. 那么如今转化为了是否能从前两组中各取一个元素.使得这两个值和为第三组一个元素的相反数. 那么对于第一组我们升序排序.第二组我们降序排序. 对于第三组里的任一元素,假如第一组队首加第二组队首之和大于第三组的元素.那么第二组游标往后移一位,反之第一组移…

原题链接 思路:哈希存入相反数 注意:HDU不支持long long要使用__int64 #include<cstdio> #include<cstring> #define mod 401704//开到所有数据十倍大左右 using namespace std; bool flag[mod]; __int64 m[][],hash[mod]; int judge(__int64 x) { int s=x%mod; ) s+=mod;//将负数转正 /*while(x<0)…

Trouble Time Limit: 5000MS   Memory Limit: 32768KB   64bit IO Format: %I64d & %I64u Submit Status Description Hassan is in trouble. His mathematics teacher has given him a very difficult problem called 5-sum. Please help him. The 5-sum problem is def…

Trouble Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3526    Accepted Submission(s): 1113 Problem Description Hassan is in trouble. His mathematics teacher has given him a very difficult pro…

Trouble Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5681    Accepted Submission(s): 1570 Problem Description Hassan is in trouble. His mathematics teacher has given him a very difficult pro…

Trouble Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5388    Accepted Submission(s): 1494 Problem Description Hassan is in trouble. His mathematics teacher has given him a very difficult pro…

题目:click here 题意: 给定5组数据,每组数据选择一个数,看是否能找到5个数的和为零. 分析: 千万不要~~T~~ 普通线性查找: #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> using namespace std; typedef long long ll; const int INF = 0x3f3f3f3f; ; int t, n…

今天因为要用到List的查找功能,所以写了一段测试代码,测试线性查找和二分查找的性能差距,以决定选择哪种查找方式. 线性查找:Contains,Find,IndexOf都是线性查找. 二分查找:BinarySearch,因为二分查找必须是对有序数组才有效,所以查找前要调用List的Sort方法. 结论:如果List项的个数比较小,用线性查找要略快于二分查找,项的个数越多二分算法优势越明显.可根据实际情况选用适合的查找方式. 测试结果: 测试代码: private void button1_Cli…

病毒侵袭 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 19465    Accepted Submission(s): 4814 Problem Description 当太阳的光辉逐渐被月亮遮蔽,世界失去了光明,大地迎来最黑暗的时刻....在这样的时刻,人们却异常兴奋——我们能在有生之年看到500年一遇的世界奇观,那是多么幸福的事儿…

线性查找  Linear Search 用户输入学生学号的成绩 二分查找  Binary Search 要求数据表是已经排好序的 程序存在小的瑕疵…