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import java.util.*;
public class Main
{
public static void main(String[] args) {
System.out.println(licensePlateNumber(1));
System.out.println(licensePlateNumber(100000));
System.out.println(licensePlateNumber(100001));
System.out.println(licensePlateNumber(100002));
// System.out.println(licensePlateNumber(175256));
}
public static String licensePlateNumber(long val) {
long pow10[] = new long[6];
long pow26[] = new long[6];
pow10[0] = 1;
pow26[0] = 1;
for (int i = 1; i <= 5; i++) {
pow10[i] = (10*pow10[i - 1]);
pow26[i] = (26*pow26[i - 1]);
}
for (int alphabets = 0; alphabets <= 5; alphabets++) {
int digits = 5 - alphabets;
long count = pow10[digits]*pow26[alphabets];
if (val <= count) {
long ratio = val/pow10[digits];
if (val%pow10[digits] != 0) {
ratio++;
}
//System.out.println("ratio " + ratio);
val = val - (ratio - 1)*(pow10[digits]);
return createString(ratio - 1, alphabets) + extraPad(val - 1, digits, '0');
} else {
val = val - count;
}
}
return "";
}
public static String extraPad(long val, int digits, char ch) {
//System.out.println(val + " " + digits + " " + ch);
if (digits == 0) {
return "";
} else {
String str = Long.toString(val);
while (str.length() < digits) {
str = ch + str;
}
return str;
}
}
public static String createString(long ratio, int alphabets) {
// System.out.println(ratio + " " + alphabets);
if (alphabets == 0) {
return "";
} else {
StringBuilder sb = new StringBuilder();
while (ratio != 0) {
long rem = ratio%26;
sb.append(findAlphabet((int)rem));
ratio = ratio/26;
}
String result = sb.reverse().toString();
while (result.length() < alphabets) {
result = "A" + result;
}
return result;
}
}
public static char findAlphabet(int index) {
String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
return str.charAt(index);
}
}
Compiling Program...
Standard Input:
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Text
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