HDU 1829 A Bug's Life

C - A Bug's Life
Time Limit:5000MS Memory Limit:32768KB 64bit IO Format:%I64d
& %I64u
SubmitStatusPracticeHDU
1829

Description

Background

Professor Hopper is researching the sexual behavior of a rare species of bugs. He assumes that they feature two different genders and that they only interact with bugs of the opposite gender. In his experiment, individual bugs and their interactions were easy
to identify, because numbers were printed on their backs.

Problem

Given a list of bug interactions, decide whether the experiment supports his assumption of two genders with no homosexual bugs or if it contains some bug interactions that falsify it.

Input

The first line of the input contains the number of scenarios. Each scenario starts with one line giving the number of bugs (at least one, and up to 2000) and the number of interactions (up to 1000000) separated by a single space.
In the following lines, each interaction is given in the form of two distinct bug numbers separated by a single space. Bugs are numbered consecutively starting from one.

Output

The output for every scenario is a line containing "Scenario #i:", where i is the number of the scenario starting at 1, followed by one line saying either "No suspicious bugs found!" if the experiment is consistent with his assumption
about the bugs' sexual behavior, or "Suspicious bugs found!" if Professor Hopper's assumption is definitely wrong.

Sample Input

2
3 3
1 2
2 3
1 3
4 2
1 2
3 4

Sample Output

Scenario #1:
Suspicious bugs found!

Scenario #2:
No suspicious bugs found!

Hint

Huge input,scanf is recommended.

题目大概意思是说：一群虫子XXOO，找出有没有GAY.。

这题当时还蛮困扰我了。后来开了个数组保存几何内各个元素的对象（假设都是异性）；

然后合并的时候判断一下各自的对象。

输出格式有点坑，要打空行。

#include <stdio.h>
#define N 2005
int fa
,object
;
int flag;
void InitSet(int n)
{
flag=1;
for(int i=1; i<=n; i++)
{
fa[i] = i;
object[i]=0;
}
}
int Find(int x)
{
return fa[x] == x ? x : fa[x] = Find(fa[x]) ;
}
void Merge(int u ,int v)
{
int fu = Find(u), fv = Find(v);
if(fu!=fv)
{
if(object[fu]!=0)
fa[object[fu]]=fv;
if(object[v]!=0)
fa[object[fv]]=fu;
object[fu]=fv;
object[fv]=fu;
}
else
{
if(fu==fv)
{
flag=0;
}
}

}

int main()
{
int t;
scanf("%d",&t);
int c=1;
while(t--)
{
int n,k;
scanf("%d%d",&n,&k);
InitSet(n);
int a,b;
for(int i=0;i<k;i++)
{
scanf("%d%d",&a,&b);
Merge(a,b);
}
printf("Scenario #%d:\n",c++);
if(flag)
printf("No suspicious bugs found!\n");
else
printf("Suspicious bugs found!\n");
printf("\n");
}
}