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twitterTrends.java
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twitterTrends.java
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/*
https://www.hackerearth.com/practice/algorithms/string-algorithm/string-searching/practice-problems/algorithm/twitter-trends/
*/
import java.util.*;
import java.io.*;
public class twitterTrends
{
private static InputStream stream;
private static byte[] buf = new byte[1024];
private static int curChar;
private static int numChars;
private static SpaceCharFilter filter;
private static PrintWriter pw;
static int MOD = 1000000007;
// Driver program to test above functions
public static void main(String[] args)
{
InputReader(System.in);
pw = new PrintWriter(System.out);
int N = nextInt();
String tweets [] = nextStringLineArray(N);
TreeMap<String, Integer> treeMap = new TreeMap<>();
for (int i = 0; i <N; i++) {
String tweetParts [] = tweets[i].split(" ");
for (int j = 0; j <tweetParts.length; j++) {
String s = tweetParts[j];
if (s.startsWith("#")){
if (treeMap.containsKey(s))
treeMap.put(s,treeMap.get(s)+1);
else
treeMap.put(s,1);
}
}
}
// System.out.println(treeMap);
ArrayList<String> list = new ArrayList<>();
while(!treeMap.isEmpty()){
int max = Integer.MIN_VALUE;
String ht = "";
for (String hs : treeMap.keySet()) {
if (treeMap.get(hs)>max){
max = treeMap.get(hs);
ht = hs;
}
}
treeMap.remove(ht,max);
list.add(ht);
}
for (int i = 0; i <5; i++) {
pw.println(list.get(i));
}
pw.flush();
pw.close();
}
// Fast IO templates
public static void InputReader(InputStream stream1) {
stream = stream1;
}
private static boolean isWhitespace(int c) {
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
private static boolean isEndOfLine(int c) {
return c == '\n' || c == '\r' || c == -1;
}
private static int read() {
if (numChars == -1)
throw new InputMismatchException();
if (curChar >= numChars) {
curChar = 0;
try {
numChars = stream.read(buf);
} catch (IOException e) {
throw new InputMismatchException();
}
if (numChars <= 0)
return -1;
}
return buf[curChar++];
}
private static int nextInt() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
int res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
private static long nextLong() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
long res = 0;
do {
if (c < '0' || c > '9')
throw new InputMismatchException();
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
private static String nextToken() {
int c = read();
while (isSpaceChar(c))
c = read();
StringBuilder res = new StringBuilder();
do {
res.appendCodePoint(c);
c = read();
} while (!isSpaceChar(c));
return res.toString();
}
private static String nextLine() {
int c = read();
while (isSpaceChar(c))
c = read();
StringBuilder res = new StringBuilder();
do {
res.appendCodePoint(c);
c = read();
} while (!isEndOfLine(c));
return res.toString();
}
private static int[] nextIntArray(int n) {
int[] arr = new int[n];
for (int i = 0; i < n; i++) {
arr[i] = nextInt();
}
return arr;
}
private static int[][] next2dArray(int n, int m) {
int[][] arr = new int[n][m];
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
arr[i][j] = nextInt();
}
}
return arr;
}
private static char[][] nextCharArray(int n,int m){
char [][]c=new char[n][m];
for(int i=0;i<n;i++){
String s=nextLine();
for(int j=0;j<s.length();j++){
c[i][j]=s.charAt(j);
}
}
return c;
}
private static long[] nextLongArray(int n) {
long[] arr = new long[n];
for (int i = 0; i < n; i++) {
arr[i] = nextLong();
}
return arr;
}
private static String[] nextStringArray(int n) {
String ans [] = new String[n];
for (int i = 0; i <n; i++) {
ans [i] = nextToken();
}
return ans;
}
private static String[] nextStringLineArray(int n) {
String ans [] = new String[n];
for (int i = 0; i <n; i++) {
ans [i] = nextLine();
}
return ans;
}
private static void pArray(int[] arr) {
for (int i = 0; i < arr.length; i++) {
pw.print(arr[i] + " ");
}
pw.println();
return;
}
private static void pArray(long[] arr) {
for (int i = 0; i < arr.length; i++) {
pw.print(arr[i] + " ");
}
pw.println();
return;
}
private static void pArray(boolean[] arr) {
for (int i = 0; i < arr.length; i++) {
pw.print(arr[i] + " ");
}
pw.println();
return;
}
private static boolean isSpaceChar(int c) {
if (filter != null)
return filter.isSpaceChar(c);
return isWhitespace(c);
}
private interface SpaceCharFilter {
public boolean isSpaceChar(int ch);
}
}