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Alphabet.java
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Alphabet.java
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Alphabet {
public static class Point {
private int x;
private int y;
private int count;
private char alphabet;
private boolean visit;
public Point(int x, int y, char alphabet) {
this.x = x;
this.y = y;
this.count = 0;
this.alphabet = alphabet;
this.visit = false;
}
public int getX() {
return this.x;
}
public int getY() {
return this.y;
}
public int getCount() {
return this.count;
}
public char getAlphabet() {
return this.alphabet;
}
public boolean isVisit() {
return this.visit;
}
public void visit() {
this.visit = true;
}
public void initVisit() {
this.visit = false;
}
public void setCount(int value) {
count = Math.max(this.count, value);
}
}
public static Point[][] resultArr;
public static boolean[] alphaArr;
public static int maxValue = Integer.MIN_VALUE;
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine(), " ");
int height = Integer.parseInt(st.nextToken());
int width = Integer.parseInt(st.nextToken());
initResultArr(height, width);
initAlphaArr();
for(int i = 0; i < height; i++) {
String value = br.readLine();
mkResultArr(i, value);
}
getMaxValue(0, 0, 0);
System.out.println(maxValue);
}
public static void getMaxValue(int height, int width, int count) {
Point value = resultArr[height][width];
char alphabet = value.getAlphabet();
if(value.isVisit()) return;
if(alphaArr[alphabet - 65]) return;
int x = value.getX();
int y = value.getY();
value.visit();
alphaArr[alphabet - 65] = true;
value.setCount(count+1);
maxValue = Math.max(maxValue, count+1);
if(x > 0) {
getMaxValue(height, width-1, count + 1);
}
if(x < resultArr[0].length - 1) {
getMaxValue(height, width + 1, count + 1);
}
if(y > 0) {
getMaxValue(height-1, width, count + 1);
}
if(y < resultArr.length - 1) {
getMaxValue(height + 1, width, count + 1);
}
alphaArr[alphabet - 65] = false;
value.initVisit();
}
public static void mkResultArr(int height, String value) {
int numValue = 0;
for(int i = 0; i < value.length(); i++) {
resultArr[height][numValue] = new Point(numValue, height, value.charAt(i));
numValue++;
}
}
public static void initAlphaArr() {
alphaArr = new boolean[26];
}
public static void initResultArr(int height, int width) {
resultArr = new Point[height][width];
}
}