Hdu 6168 Numbers【思维+暴力】
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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?
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.
Eachai is in [1,10^9]
For each test case:
Each
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 integersa1,a2,...,an(a1≤a2≤...≤an) . These are numbers in sequence a.
It's guaranteed that there is only one solution for each case.
The first line is an integer n, indicating the length of sequence a;
The second line should contain n space-seprated integers
It's guaranteed that there is only one solution for each case.
Sample Input
62 2 2 4 4 4211 2 3 3 4 4 5 5 5 6 6 6 7 7 7 8 8 9 9 10 11
Sample Output
32 2 261 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"); }}
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