I am stuck. My code passed the first test case but it is failing on second and I don’t know why. I have literally tried every possible test case I can think of. Please help;
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import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.util.*;
import java.io.*;
class Rextester
{
static class Reader
{
final private int BUFFER_SIZE = 1 << 16;
private DataInputStream din;
private byte[] buffer;
private int bufferPointer, bytesRead;
public Reader()
{
din = new DataInputStream(System.in);
buffer = new byte[BUFFER_SIZE];
bufferPointer = bytesRead = 0;
}
public Reader(String file_name) throws IOException
{
din = new DataInputStream(new FileInputStream(file_name));
buffer = new byte[BUFFER_SIZE];
bufferPointer = bytesRead = 0;
}
public String readLine() throws IOException
{
byte[] buf = new byte[64]; // line length
int cnt = 0, c;
while ((c = read()) != -1)
{
if (c == '\n')
break;
buf[cnt++] = (byte) c;
}
return new String(buf, 0, cnt);
}
public int nextInt() throws IOException
{
int ret = 0;
byte c = read();
while (c <= ' ')
c = read();
boolean neg = (c == '-');
if (neg)
c = read();
do
{
ret = ret * 10 + c - '0';
} while ((c = read()) >= '0' && c <= '9');
if (neg)
return -ret;
return ret;
}
public long nextLong() throws IOException
{
long ret = 0;
byte c = read();
while (c <= ' ')
c = read();
boolean neg = (c == '-');
if (neg)
c = read();
do {
ret = ret * 10 + c - '0';
}
while ((c = read()) >= '0' && c <= '9');
if (neg)
return -ret;
return ret;
}
public double nextDouble() throws IOException
{
double ret = 0, div = 1;
byte c = read();
while (c <= ' ')
c = read();
boolean neg = (c == '-');
if (neg)
c = read();
do {
ret = ret * 10 + c - '0';
}
while ((c = read()) >= '0' && c <= '9');
if (c == '.')
{
while ((c = read()) >= '0' && c <= '9')
{
ret += (c - '0') / (div *= 10);
}
}
if (neg)
return -ret;
return ret;
}
private void fillBuffer() throws IOException
{
bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
if (bytesRead == -1)
buffer[0] = -1;
}
private byte read() throws IOException
{
if (bufferPointer == bytesRead)
fillBuffer();
return buffer[bufferPointer++];
}
public void close() throws IOException
{
if (din == null)
return;
din.close();
}
}
static class interval{
int start, end;
interval(int s, int e){
start=s;end=e;
}
public String toString(){
return "start: "+start+" end: "+end;
}
}
public static class sortbySec implements Comparator<interval>{
@Override
public int compare(interval i1, interval i2){
return (i1.end > i2.end)? 1:-1;
}
}
public static class sortbyFirst implements Comparator<interval>{
@Override
public int compare(interval i1, interval i2){
return (i1.start >= i2.start)? 1:-1;
}
}
public static void main(String[] args) throws IOException
{
Reader in=new Reader();
int test=in.nextInt();
for(int testtt=1;testtt<=test;testtt++){
int n=in.nextInt();
ArrayList<interval> ar= new ArrayList<>();
ArrayList<Integer> index= new ArrayList<>();
for(int i=0;i<n;i++){
int start=(i%2==0)? i-1:i;//in.nextInt();
index.add(start);
int end=i+1;//in.nextInt();
interval inter=new interval(start, end);
ar.add(inter);
}
ar.sort(new sortbyFirst());
int cs, ce, js, je, flag=0;
cs=ce=js=je=0;
cs=ar.get(0).start;
ce=ar.get(0).end;
char[] c= new char[n];
c[index.indexOf(cs)]='C';
// System.out.println(index.indexOf(cs));
index.set(index.indexOf(cs), -1);
// System.out.println(Arrays.toString(c));
for(int i=1;i<ar.size();i++){
//System.out.println(s);
int start=ar.get(i).start;
int end=ar.get(i).end;
int idx=index.indexOf(start);
index.set(idx, -1);
//System.out.println("index is: "+ idx);
//System.out.println(ar.get(i));
if(ce<=start){
c[idx]='C';
cs=start;ce=end;
}
else if(je<=start){
c[idx]='J';
je=end;
js=start;
}
else{
flag=1;
break;
}
}
if(flag!=1)
System.out.printf("Case #%d: %s\n",testtt, new String(c));
else {
System.out.printf("Case #%d: IMPOSSIBLE\n",testtt);
}
// System.out.println(Arrays.toString(c));
}
}
}