67 lines
1.3 KiB
Java
67 lines
1.3 KiB
Java
package day02;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileReader;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Scanner;
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public class Checksum {
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Map<Character,Integer> repeats = new HashMap<Character,Integer>();
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int twos = 0;
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int threes = 0;
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public void parseFile(File file) {
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try
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{
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Scanner scanner = new Scanner(new BufferedReader(new FileReader(file)));
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while(scanner.hasNext()) {
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String s = scanner.next();
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for (int i = 0; i < s.length(); i++ ) {
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char c = s.charAt(i);
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if (repeats.containsKey(c)) {
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int numberOfRepeats = repeats.get(c);
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repeats.put(c, ++numberOfRepeats);
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} else {
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repeats.put(c, 1);
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}
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}
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boolean twoC = false;
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boolean threeC = false;
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for (int num : repeats.values()) {
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if (num == 2 && !twoC) {
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twos++;
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twoC = true;
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} else if (num == 3 && !threeC) {
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threes++;
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threeC = true;
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}
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}
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repeats.clear();
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}
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System.out.println(twos * threes);
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scanner.close(); // close stream
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}
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catch (Exception e) {
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System.out.println(e.toString() + " : " + e.getStackTrace().toString());
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}
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}
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public static void main(String[] args) {
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Checksum chsm = new Checksum();
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File f = new File("src/day02/input.txt");
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chsm.parseFile(f);
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}
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}
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