我找不出自己的代码哪里错了你知道吗
来源:互联网 发布:mac 挂载移动硬盘 编辑:程序博客网 时间:2024/05/04 07:41
1118. Birds in Forest (25)
Some scientists took pictures of thousands of birds in a forest. Assume that all the birds appear in the same picture belong to the same tree. You are supposed to help the scientists to count the maximum number of trees in the forest, and for any pair of birds, tell if they are on the same tree.
Input Specification:
Each input file contains one test case. For each case, the first line contains a positive number N (<= 104) which is the number of pictures. Then N lines follow, each describes a picture in the format:
K B1 B2 ... BK
where K is the number of birds in this picture, and Bi's are the indices of birds. It is guaranteed that the birds in all the pictures are numbered continuously from 1 to some number that is no more than 104.
After the pictures there is a positive number Q (<= 104) which is the number of queries. Then Q lines follow, each contains the indices of two birds.
Output Specification:
For each test case, first output in a line the maximum possible number of trees and the number of birds. Then for each query, print in a line "Yes" if the two birds belong to the same tree, or "No" if not.
Sample Input:43 10 1 22 3 44 1 5 7 83 9 6 4210 53 7Sample Output:
2 10YesNo
我自己写的代码,我自己和我同学找了半天也没找到错误在哪,只得了17分,感觉很蓝瘦。以后闲着没事在来找吧。
#include<bits/stdc++.h>#define MAXN 10001using namespace std;int N,K,Q;int pre[MAXN];int a[MAXN];int book[MAXN];set<int> st;int find(int n){ int r=n; while(pre[r]!=r) r=pre[r]; int x=n,y; while(pre[x]!=r) { y=pre[x]; pre[x]=r; x=y; } return r;}void union_(int x,int y){ int a=find(x); int b=find(y); if(a!=b) pre[a]=b;}int main(){ cin>>N; int i,j,treenum=0; for(i=1;i<=MAXN;i++) pre[i]=i; memset(book,0,sizeof(book)); st.clear(); for(i=0;i<N;i++) { cin>>K; for(j=0;j<K;j++) { cin>>a[j]; st.insert(a[j]); } for(j=0;j<K;j++) find(a[j]); int flag=0,tag; for(j=0;j<K;j++) { if(book[a[j]]==1) //已经在一棵树里了 { flag=1; tag=j; break; } } if(flag==0) { treenum++; book[a[0]]=1; for(j=1;j<K;j++) { book[a[j]]=1; union_(a[0],a[j]); } } else { for(j=0;j<K;j++) { book[a[j]]=1; union_(a[j],a[tag]); } } } cout<<treenum<<' '<<st.size()<<endl; cin>>Q; int sx,sy; while(Q--) { cin>>sx>>sy; if(find(sx)==find(sy)) cout<<"Yes"<<endl; else cout<<"No"<<endl; } return 0;}
下面贴的是别人的代码,其实我对于并查集现在来说有一个很大的认识,就是对于Union_这个操作尽量用父亲节点进行操作。
#include<cstdio> #include<algorithm> using namespace std; const int maxn = 10000 + 10; bool flag[maxn] = { false }; int N, K, B; int father[maxn]; int findFather(int x) { if (x == father[x]) return x; else { int F = findFather(father[x]); father[x] = F; return F; } } int main() { for (int i = 0; i < maxn; i++) { father[i] = i; } scanf("%d", &N); int count = 0; for (int i = 0; i < N; i++) { scanf("%d", &K); int bf; for (int j = 0; j < K; j++) { scanf("%d", &B); if (!flag[B]) { count++; flag[B] = true; } if (j == 0) { bf = findFather(B); } else if(findFather(B) != findFather(bf)) { father[findFather(B)] = findFather(bf); } } } int trees = 0; for (int i = 1; i <= count; i++) { if (father[i] == i) { trees++; } } printf("%d %d\n", trees, count); int Q; scanf("%d", &Q); int a, b; for (int i = 0; i < Q; i++) { scanf("%d %d", &a, &b); if (findFather(a) == findFather(b)) printf("Yes\n"); else printf("No\n"); } return 0; }
- 我找不出自己的代码哪里错了你知道吗
- 你知道它们都是出自哪里的吗?
- 知道我为什么不再主动找你了吗?
- POJ 3009 原来写的不知道哪里错了。
- 自己写的strcamp函数不知道哪里错了
- 看着锅里没有米 突然想起了可爱的你 却不知道你现在在哪里
- 真心不知道哪里错了 。。。
- 不知道哪里错了,求指导
- 中国人为什么做不出自己的操作系统
- 中国人为什么做不出自己的操作系统
- 冀勇庆:中国人为什么做不出自己的操作系统?
- 【逻辑思考】你真的有权力活出自己吗?
- 感谢漂流瓶帮助我,并提出自己的意见
- 无意中搜索出自己做的私活 无语了 ....
- 知道你的代码哪里出了问题吗?——由控件实例化引发的运行崩溃
- 标准和 JM 代码--根据firsttime的材料整理出自己需要的加了红色标记
- 标准和 JM 代码--根据firsttime的材料整理出自己需要的加了红色标记
- 穿出自己的个性
- 两两交换链表中的节点
- git提交代码
- mysql 5.7 忘记root密码 修改密码
- 资源共享(Smart C++ 和 Cena 评测系统)
- Xcode + Github
- 我找不出自己的代码哪里错了你知道吗
- 完全背包 battle ships
- 2017 4C 赛后总结
- 非常可乐 HDU
- 深入理解java异常处理机制
- 在CentOS上一键安装OpenStack
- RecyclerView简单使用介绍
- mysql主从数据不同步
- 国际化