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GuessNumber.java
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GuessNumber.java
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package guess_number;
import java.util.*;
import org.junit.*;
import static org.junit.Assert.*;
public class GuessNumber {
/*
Guess Number
AirBnB Interview Question
*/
public class Solution {
String target;
public Solution(String target) {
this.target = target;
}
private int guessServer(String guess) {
int res = 0;
Map<Character, Integer> targetMap = new HashMap<>();
for (char c : target.toCharArray()) targetMap.put(c, targetMap.getOrDefault(c, 0) + 1);
Map<Character, Integer> guessMap = new HashMap<>();
for (char c : guess.toCharArray()) guessMap.put(c, guessMap.getOrDefault(c, 0) + 1);
for (char k : guessMap.keySet()) {
if (targetMap.containsKey(k))
res += Math.min(guessMap.get(k), targetMap.get(k));
}
return res;
}
private String genNumber(List<Integer> guessed, int c) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < guessed.size(); i++)
sb.append(guessed.get(i));
for (int i = guessed.size(); i < 4; i++)
sb.append(c);
return sb.toString();
}
private String genNumber(List<Integer> guessed) {
if (guessed == null || guessed.size() == 0) return "";
StringBuilder sb = new StringBuilder();
for (int i = 0; i < guessed.size(); i++)
sb.append(guessed.get(i));
return sb.toString();
}
public String guess() {
List<Integer> res = new ArrayList<>();
List<Integer> cands = new ArrayList<Integer>() {{
add(1);
add(2);
add(3);
add(4);
add(5);
// insert(6);
}};
// System.out.println("\nstart to guess " + target + " ...");
// System.out.println("res: " + res);
// System.out.println("candList: " + candList);
int counter = 0;
Iterator<Integer> iter = cands.iterator();
while (iter.hasNext() && res.size() < 4) {
int cand = iter.next();
counter++;
int guessedCount = res.size();
String guessCand = genNumber(res, cand);
int guessRes = guessServer(guessCand);
// System.out.println("cand: " + cand);
// System.out.println("guessRes: " + guessRes);
if (guessRes == guessedCount) {
iter.remove();
} else if (guessRes > guessedCount) {
for (int i = guessedCount; i < guessRes; i++) {
res.add(cand);
}
iter.remove();
} else {
// something wrong here
return genNumber(res);
}
}
if (res.size() < 4) {
for (int i = res.size(); i < 4; i++)
res.add(6);
}
// System.out.println("guessed " + counter + " times");
return genNumber(res);
}
}
public static class UnitTest {
@Test
public void test() {
String guess = "2345";
Solution sol = new GuessNumber().new Solution(guess);
assertEquals(guess, sol.guess());
guess = "3456";
sol = new GuessNumber().new Solution(guess);
assertEquals(guess, sol.guess());
guess = "4536";
sol = new GuessNumber().new Solution(guess);
char[] res = guess.toCharArray();
Arrays.sort(res);
assertEquals(new String(res), sol.guess());
guess = "1111";
sol = new GuessNumber().new Solution(guess);
assertEquals(guess, sol.guess());
guess = "6666";
sol = new GuessNumber().new Solution(guess);
assertEquals(guess, sol.guess());
guess = "2266";
sol = new GuessNumber().new Solution(guess);
assertEquals(guess, sol.guess());
guess = "5566";
sol = new GuessNumber().new Solution(guess);
assertEquals(guess, sol.guess());
}
}
}