Hdu 6168 Numbers【思维+暴力】
2017-08-22 18:28
405 查看
Numbers
Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 71 Accepted Submission(s): 34
Problem Description
zk has n numbers a1,a2,...,an.
For each (i,j) satisfying 1≤i<j≤n, zk generates a new number (ai+aj).
These new numbers could make up a new sequence b1,b2,...,bn(n−1)/2.
LsF wants to make some trouble. While zk is sleeping, Lsf mixed up sequence a and b with random order so that zk can't figure out which numbers were in a or b. "I'm angry!", says zk.
Can you help zk find out which n numbers were originally in a?
Input
Multiple test cases(not exceed 10).
For each test case:
∙The
first line is an integer m(0≤m≤125250), indicating the total length of a and b. It's guaranteed m can be formed as n(n+1)/2.
∙The
second line contains m numbers, indicating the mixed sequence of a and b.
Each ai is
in [1,10^9]
Output
For each test case, output two lines.
The first line is an integer n, indicating the length of sequence a;
The second line should contain n space-seprated integers a1,a2,...,an(a1≤a2≤...≤an).
These are numbers in sequence a.
It's guaranteed that there is only one solution for each case.
Sample Input
6
2 2 2 4 4 4
21
1 2 3 3 4 4 5 5 5 6 6 6 7 7 7 8 8 9 9 10 11
Sample Output
3
2 2 2
6
1 2 3 4 5 6
题目大意:
如果我们现在有一个数组A【】,那么我们每一次拿出两个数A【i】和A【j】,使得B【cnt++】=A【i】+A【j】,主人公不小心把两个数组并到了一起,并且还是从小到大保证递增的,问我们数组A【】的信息。输出其大小和元素。
思路:
考虑到A【】数组的最大长度是500.那么我们暴力去搞就行。
最小的数肯定属于A【】,理所当然倒数第二小的数也肯定属于A【】,那么我们就可以根据这两个数确定一个B【】肯定有的,那么我们将全部序列中去掉这几个数之后,肯定接下来那个最小的数也属于A【】;依次类推,搞搞就行了。
时间复杂度O(n+500^2);
Ac代码:
#include<stdio.h>
#include<string.h>
#include<map>
using namespace std;
int a[125255];
int output[125255];
int main()
{
int n;
while(~scanf("%d",&n))
{
int ans=0;
for(int i=1;i<=n;i++)
{
if(i+(i)*(i-1)/2==n)
{
ans=i;
}
}
map<int,int>s;
for(int i=1;i<=n;i++)scanf("%d",&a[i]);
int cnt=0;
for(int i=1;i<=n;i++)
{
if(s[a[i]]>0)
{
s[a[i]]--;
}
else
{
for(int j=0;j<cnt;j++)
{
s[a[i]+output[j]]++;
}
output[cnt++]=a[i];
}
}
printf("%d\n",cnt);
for(int i=0;i<cnt;i++)
{
if(i>0)printf(" ");
printf("%d",output[i]);
}
printf("\n");
}
}
相关文章推荐
- HDU 6168 Numbers 思维
- hdu 6168 Numbers(多校联赛)
- HDU 3835R(N)(加点思维的暴力枚举)
- HDU-1058 Humble Numbers 暴力 Or 动态规划
- HDU 5505 GT and numbers【思维+GCD】
- 刷题——hdu 6168 Numbers
- HDU 6168 Numbers(规律)
- HDU 5522 Numbers (暴力枚举)
- hdu 5676 ztr loves lucky numbers(BC——暴力打表+二分查找)
- HDU 6168 Numbers
- HDU 6168 - Numbers | 2017 ZJUT Multi-University Training 9
- 数论 - 筛法暴力打表 --- hdu : 12876 Quite Good Numbers
- HDU 6168-Numbers
- HDU 6168 - Numbers 水题 2017 Multi-University Training Contest - Team 9
- 数论 - 筛法暴力打表 --- hdu : 12876 Quite Good Numbers
- HDU 5533 Dancing Stars on Me (暴力模拟+思维)
- TIANKENG’s restaurant(Ⅱ) hdu 4886 思维暴力
- HDU 6168 Numbers(multiset)
- HDU 6168 - Numbers 水题 2017 Multi-University Training Contest - Team 9
- HDU - 6168 Numbers(贪心+优先队列)