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MajorityElement.java
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MajorityElement.java
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import java.util.*;
import java.io.*;
public class MajorityElement {
private static int getMajorityElement(int[] a, int left, int right) {
HashMap<Integer,Integer> frequency = new HashMap<>();
for(int i=0;i<a.length;i++){
if (frequency.get(a[i]) == null){
frequency.put(a[i], 1);
}else{
frequency.put(a[i], frequency.get(a[i])+1);
}
}
for (Map.Entry<Integer, Integer> entry : frequency.entrySet()) {
if(entry.getValue()>a.length/2)
return 0;
}
return -1;
}
public static void main(String[] args) {
FastScanner scanner = new FastScanner(System.in);
int n = scanner.nextInt();
int[] a = new int[n];
for (int i = 0; i < n; i++) {
a[i] = scanner.nextInt();
}
if (getMajorityElement(a, 0, a.length) != -1) {
System.out.println(1);
} else {
System.out.println(0);
}
}
static class FastScanner {
BufferedReader br;
StringTokenizer st;
FastScanner(InputStream stream) {
try {
br = new BufferedReader(new InputStreamReader(stream));
} catch (Exception e) {
e.printStackTrace();
}
}
String next() {
while (st == null || !st.hasMoreTokens()) {
try {
st = new StringTokenizer(br.readLine());
} catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}
int nextInt() {
return Integer.parseInt(next());
}
}
}