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102 lines (83 loc) · 2.86 KB
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashSet;
/**
* Created with IntelliJ IDEA.
* User: windows 7
* Date: 11/29/14
* Time: 12:47 PM
* To change this template use File | Settings | File Templates.
*/
public class Main {
public static void main(String[] args) throws Exception {
ArrayList<HashSet<Integer>> samecountryList = new ArrayList<HashSet<Integer>>();
int numberOfAst;
int samecountryCases;
String test;
HashSet<Integer> tempIntegerHashSet = null;
long permissiblePairs = 0;
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
test = bufferedReader.readLine();
String[] result = test.split(" ");
numberOfAst = Integer.parseInt(result[0]);
samecountryCases = Integer.parseInt(result[1]);
for (int x = 0; x < samecountryCases; x++) {
test = bufferedReader.readLine();
result = test.split(" ");
int key = Integer.parseInt(result[0]);
int value = Integer.parseInt(result[1]);
tempIntegerHashSet = null;
if (x == 0) {
HashSet<Integer> hashSet = new HashSet<Integer>();
hashSet.add(key);
hashSet.add(value);
samecountryList.add(hashSet);
} else {
for (HashSet<Integer> i : samecountryList) {
if (i.contains(key) || i.contains(value)) {
tempIntegerHashSet = i;
break;
}
}
if(tempIntegerHashSet == null)
{
HashSet<Integer> hashSet = new HashSet<Integer>();
hashSet.add(key);
hashSet.add(value);
samecountryList.add(hashSet);
}else{
tempIntegerHashSet.add(key);
tempIntegerHashSet.add(value);
}
}
}
/* for (HashSet<Integer> i : samecountryList) {
for(Integer k : i)
{
System.out.print(k+" ");
}
System.out.println();
}
if(true)return;*/
for(int x=0;x<numberOfAst;x++)
{
for(int y=x+1;y<numberOfAst;y++)
{
boolean sameCflag = false;
for (HashSet<Integer> i : samecountryList) {
if(i.contains(x) && i.contains(y))
{
sameCflag = true;
break;
}
}
if(!sameCflag)
{
permissiblePairs++;
}
}
}
System.out.println(permissiblePairs);
}
}