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Main.java
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85 lines (82 loc) · 2.59 KB
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
class Main{
public static boolean checkPossibility(String inputString,int index){
if(inputString.length()==index){
// System.out.println(inputString+" is input string");
for(int i=0;i<inputString.length()-4;i++){
for(int j=i+5;j<=inputString.length();j++){
StringBuilder s1 = new StringBuilder(inputString.substring(i, j));
StringBuilder s2 = new StringBuilder(inputString.substring(i, j));
s2.reverse();
if(s1.toString().equals(s2.toString())){
return false;
}
}
}
return true;
}
if(inputString.charAt(index)=='?' && (index+1)<inputString.length()){
boolean r1= checkPossibility(inputString.substring(0,index)+"1"+inputString.substring(index+1),index+1);
boolean r2= checkPossibility(inputString.substring(0,index)+"0"+inputString.substring(index+1),index+1);
return r1|r2;
}else if (inputString.charAt(index)=='?'){
boolean r1= checkPossibility(inputString.substring(0,index)+"1",index+1);
boolean r2= checkPossibility(inputString.substring(0,index)+"0",index+1);
return r1|r2;
}else {
return checkPossibility(inputString,index+1);
}
}
public static void main(String[] args) {
FastReader sc = new FastReader();
int t = sc.nextInt();
int tc = t;
while(t-- !=0){
int length=sc.nextInt();
String inputString = sc.nextLine();
String ans = (checkPossibility(inputString,0))? "POSSIBLE" : "IMPOSSIBLE";
System.out.println(ans);
}
}
static class FastReader {
BufferedReader br;
StringTokenizer st;
public FastReader()
{
br = new BufferedReader(
new InputStreamReader(System.in));
}
String next()
{
while (st == null || !st.hasMoreElements()) {
try {
st = new StringTokenizer(br.readLine());
}
catch (IOException e) {
e.printStackTrace();
}
}
return st.nextToken();
}
int nextInt() { return Integer.parseInt(next()); }
long nextLong() { return Long.parseLong(next()); }
double nextDouble()
{
return Double.parseDouble(next());
}
String nextLine()
{
String str = "";
try {
str = br.readLine();
}
catch (IOException e) {
e.printStackTrace();
}
return str;
}
}
}