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AvoidAndSurvive.java
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AvoidAndSurvive.java
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.LinkedList;
import java.util.List;
import java.util.StringTokenizer;
public class AvoidAndSurvive {
private static String[][] resultArr;
private static List<int[]> teacherList = new LinkedList<>();
private static boolean flag = false;
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st;
int N = Integer.parseInt(br.readLine());
initResultArr(N, N);
for(int height = 0; height < N; height++) {
st = new StringTokenizer(br.readLine(), " ");
mkResultArr(st, height);
}
dfs(0);
printResult();
}
private static void initResultArr(int height, int width) {
resultArr = new String[height][width];
}
private static void mkResultArr(StringTokenizer st, int height) {
int width = 0;
for(;st.hasMoreTokens();) {
String value = st.nextToken();
resultArr[height][width] = value;
if(value.equals("T")) teacherList.add(new int[]{height, width});
width++;
}
}
private static void dfs(int count) {
if(count == 3) {
if(checkValidation()) flag = true;
return;
}
for(int height = 0; height < resultArr.length; height++) {
for(int width = 0; width < resultArr.length; width++) {
if(flag) break;
String currentValue = resultArr[height][width];
if(currentValue.equals("X")) {
resultArr[height][width] = "O";
dfs(count + 1);
resultArr[height][width] = "X";
}
}
}
}
private static boolean checkValidation() {
for(int[] arr : teacherList) {
int x = arr[1];
int y = arr[0];
for(int index = x-1; index >= 0; index--) {
String currentValue = resultArr[y][index];
if(currentValue.equals("O")) break;
if(currentValue.equals("S")) return false;
}
for(int index = x + 1; index < resultArr.length; index++) {
String currentValue = resultArr[y][index];
if(currentValue.equals("O")) break;
if(currentValue.equals("S")) return false;
}
for(int index = y - 1; index >= 0; index--) {
String currentValue = resultArr[index][x];
if(currentValue.equals("O")) break;
if(currentValue.equals("S")) return false;
}
for(int index = y + 1; index < resultArr.length; index++) {
String currentValue = resultArr[index][x];
if(currentValue.equals("O")) break;
if(currentValue.equals("S")) return false;
}
}
return true;
}
private static void printResult() {
if(flag) {
System.out.println("YES");
return;
}
System.out.println("NO");
}
}