hdu 2100 Lovekey
import java.math.BigInteger;
import java.util.Scanner;
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
init(200);
String tmpStr;
char[] ch1, ch2;
Scanner cin = new Scanner(System.in);
while(cin.hasNext()) {
tmpStr = cin.next();
ch1 = tmpStr.toCharArray();
tmpStr = cin.next();
ch2 = tmpStr.toCharArray();
BigInteger a = BigInteger.ZERO;
BigInteger b = BigInteger.ZERO;
int i, len = ch1.length;
for(i = 0; i < len; i++) {
long t = (long)ch1[i] - 'A';
a = a.add(BigInteger.valueOf(t).multiply(pow26[len - i - 1]));
}
len = ch2.length;
for(i = 0; i < len; i++) {
long t = (long)ch2[i] - 'A';
b = b.add(BigInteger.valueOf(t).multiply(pow26[len - i - 1]));
}
a = a.add(b);
tmpStr = a.toString(26);
// System.out.println("a=" + a + " " + "tmpStr=" + tmpStr);
ch1 = tmpStr.toCharArray();
len = ch1.length;
for(i = 0; i < len; i++) {
if('a' <= ch1[i] && ch1[i] <= 'z')
ch1[i] = (char)(ch1[i] - 'a' + 58);
}
for(i = 0; i < len; i++) {
System.out.print((char)(ch1[i] - '0' + 'A'));
}
System.out.println();
}
}
public static void init(final int n) {
BigInteger big26 = BigInteger.valueOf(26);
pow26[0] = BigInteger.ONE;
for(int i = 1; i <= n; i++) {
pow26[i] = pow26[i - 1].multiply(big26);
}
}
static final BigInteger[] pow26 = new BigInteger[210];
}
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