HDOJ-2120 Ice_cream's world I
2016-08-01 20:56
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Ice_cream's world I
Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1280 Accepted Submission(s): 765
[align=left]Problem Description[/align]
ice_cream's world is a rich country, it has many fertile lands. Today, the queen of ice_cream wants award land to diligent ACMers. So there are some watchtowers are set up, and wall between watchtowers be build, in order to partition
the ice_cream’s world. But how many ACMers at most can be awarded by the queen is a big problem. One wall-surrounded land must be given to only one ACMer and no walls are crossed, if you can help the queen solve this problem, you will be get a land.
[align=left]Input[/align]
In the case, first two integers N, M (N<=1000, M<=10000) is represent the number of watchtower and the number of wall. The watchtower numbered from 0 to N-1. Next following M lines, every line contain two integers A, B mean between
A and B has a wall(A and B are distinct). Terminate by end of file.
[align=left]Output[/align]
Output the maximum number of ACMers who will be awarded.
One answer one line.
[align=left]Sample Input[/align]
8 10
0 1
1 2
1 3
2 4
3 4
0 5
5 6
6 7
3 6
4 7
[align=left]Sample Output[/align]
3
[align=left]Author[/align]
Wiskey
介个题就是利用并查集判断有几个环,在判断两个不相等的数的根节点相等时就是一个环。
代码:
#include <cstdio> #include <iostream> #include <algorithm> #include <cmath> #include <cstring> #define M 10000+10 using namespace std; int ans; int fa[M]; void init() { for(int i=0;i<M;i++) fa[i]=i; } int findroot(int x) { if(x!=fa[x]) fa[x]=findroot(fa[x]); return fa[x]; } void Union(int x,int y) { int nx=findroot(x); int ny=findroot(y); if(nx!=ny) fa[ny]=nx; else ans++; } int main() { int m,n; while(~scanf("%d%d",&n,&m)) { ans=0; init(); int a,b; for(int i=0;i<m;i++) { scanf("%d%d",&a,&b); Union(a,b); } printf("%d\n",ans); } return 0; }
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