专题四1019

题意：给定一系列数对，然后不断的给出这样的数对，问有没有性别不对的情况。

解题思路:并查集的简单应用，就是同性别的合并在一个集合中，然后每次输入看u，v是否在同一个集合中

AC源码

#include<iostream>

#include<stdio.h>

#include<cstdio>

#define N 2005

using namespace std;

int f
,rank
, n, k;

bool flag;

inline void init(){

flag=false;

for(int i=0; i<=n; ++i)

f[i]=i, rank[i]=0;

}

int find(int x){

if(x==f[x])return f[x];

int t=find(f[x]);

rank[x] = (rank[f[x]]+rank[x])&1;

f[x]=t;

return f[x];

}

void Union(int x, int y){

int a=find(x), b=find(y);

if(a==b){

if(rank[x]==rank[y])

flag=true;

return;

}

f[a]=b;

rank[a] = (rank[x]+rank[y]+1)&1;

}

int main(){

int T,a,b,cas=1;

cin>>T;

while(T--){

cin>>n>>k;

init();

for(int i=0; i<k; ++i){

cin>>a>>b;

if(flag)continue;

Union(a,b);

}

cout<<"Scenario #"<<cas++<<endl;

if(flag)cout<<"Suspicious bugs found!"<<endl;

else cout<<"No suspicious bugs found!"<<endl;

cout<<endl;

}

return 0;

}

Problem S

Time Limit : 15000/5000ms (Java/Other) Memory Limit : 32768/32768K (Java/Other)
Total Submission(s) : 23 Accepted Submission(s) : 8
[align=left]Problem Description[/align]
<b>Background </b><br>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. <br><br><b>Problem </b><br>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.<br>

[align=left]Input[/align]
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.

[align=left]Output[/align]
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.

[align=left]Sample Input[/align]

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

[align=left]Sample Output[/align]

Scenario #1:
Suspicious bugs found!

Scenario #2:
No suspicious bugs found!

<div style='font-family:Times New Roman;font-size:14px;background-color:F4FBFF;border:#B7CBFF 1px dashed;padding:6px'><div style='font-family:Arial;font-weight:bold;color:#7CA9ED;border-bottom:#B7CBFF 1px dashed'><i>Hint</i></div>Huge input,scanf is recommended.</div>

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