Equations Problem Description Consider equations having the following form: a*x1^2+b*x2^2+c*x3^2+d*x4^2=0a, b, c, d are integers from the interval [-5
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2017-02-17 11:32:00
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EquationsTime Limit: 6000/3000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2879Accepted Submission(s):
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2021-07-29 16:24:36
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A=cos(pi*x-pi/2)i+sin(pi*x)j 正电荷形成的电场 负电荷形成的电场 正负电荷形成的电场 无限长导线上均匀分布的正电荷 电场 均匀分布电荷的平面 电场 电荷均匀分布的球面形成的电场 磁铁的磁场 均匀电流导线上的磁场 电流环形成的磁场
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2021-08-26 09:43:34
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题目地址：点击打开链接
思路：不能直接用二次函数根的判别公式，因为a,b,c的不同取值会导致函数变成常函数，一次函数等
a=0
b=0
c=0
INF
对任何数都成立
a=0
b=0
c!=0
0
常函数
a=0
b!=0
c=0
1
一次函数
a=0
b!=0
c!=0
1
一次函数
a!=0
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2022-08-04 09:12:56
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EquationsTime Limit: 6000/3000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5526 Accepted Submission(s): 2193Problem DescriptionConsider equations h
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2022-12-02 00:22:59
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题意：求方程解的个数这里4个x都不相关，所以只要计算 ax1^2+bx2^2==cx3^2+dx4^2遍历找出左边所有的解，然后对应找出右式的值对应的答案（这里0都挖掉了）从1开始遍历（因为平方-1和1解不重复计算）最后结果*16 //这一步优化很给力#include #include #define N 1000001int hash1[N],hash2[N];
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2021-08-13 14:25:22
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题目地址：点击打开链接思路：先排序，再依次输出式子短的AC代码：#include #includeusing namespace std;int pos[31];int a[31];int flag,num,n;void print(int sum){ int i; for(i=pos[num-1]+1; i<n; i++) {
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2022-08-04 09:24:42
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2022-08-06 00:07:33
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将所有的组合方式分成两组，其中一组存在哈希表里，这样时间复杂度就降为了2*n*n。#includnclude<q...
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2022-10-19 16:14:02
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Problem Description
Consider equations h
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2022-12-02 00:32:03
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EquationsTime Limit: 6000/3000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3853Accepted Submission(s): 1551Problem DescriptionConsider equations having the following form:a*x1^2+b*x2^2+c*x3^2+d*x4^2=0a, b, c, d are integers from the interval [-50,50] and any of them
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2013-05-22 16:10:00
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题目链接：http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&categor
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2013-03-24 12:09:00
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解题报告：题目意思很好理解，就是求有多少种方程的解的形式，输出来就可以了。如果用4重循环的话，可能会超时，没有试过。。直接用hash一一对应就可以了。2重循环把s = a*x1*x1+b*x2*x2 看做一个数组的下标，如果s > 0 ,hash1[s]++;若s 再2重循环把s = c*x3*x3+d*x4*x4 看做下标，开始查找。#include#i
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2022-08-05 15:51:48
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Additive equations
Time Limit: 10 Seconds
Memory Limit: 32768 KB
We all understand that an integer set is a collection of distinct integers. Now the question is: given an integer set, can you
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2023-04-20 11:31:59
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Equationshttp://acm.hdu.edu.cn/showproblem.php?pid=1496Time Limit: 6000/3000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Problem DescriptionConsider eq
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2023-04-12 06:18:54
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EquationsTime Limit: 6000/3000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5596 Accepted Submission(s): 2221Problem DescriptionConsider equations hav
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2023-02-20 02:01:34
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【题目链接】 http://acm.hdu.edu.cn/showproblem.php?pid=1496 【题目大意】 给出一个方程ax1^2+bx2^2+cx3^2+dx4^2=0，求-100到100范围内的解集数量 【题解】 将ax1^2+bx2^2存入哈希，反查-cx3^2-dx4^2. 【
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2017-01-19 14:46:00
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All the two important problems that the EM theory trys to describe and explain are propogation and radiation of EM wave, on the basic of Maxwell Equat
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2021-08-26 09:59:03
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Problem Description We all understand that an integer set is a collection of distinct integers. Now the question is: given an integer set, can you find all its addtive equations? To explain what a
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2021-07-06 14:04:14
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Dreisam EquationsTime Limit:10 Seconds Memory Limit:32768 KB Special JudgeDuring excavations in the Dreisamwuste, a desert on some far away and probably uncivilized planet, sheets of paper containing mysterious symbols had been found. After a long investigation, the project scientists have concluded
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2013-06-09 10:26:00
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