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/*//////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//BOCA Online Contest Administrator
// Copyright (C) 2003-2012 by BOCA Development Team (bocasystem@gmail.com)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
////////////////////////////////////////////////////////////////////////////////
// Last modified 05/aug/2012 by cassio@ime.usp.br
/*hex1 e hex2 sao strings hexa
*devolve a soma das duas
*/
var hexchr="0123456789abcdef";
function bighexsoma (hex1, hex2){
if (hex1.length > hex2.length) {
a = hex2;
hex2 = hex1;
hex1 = a;
}
while (hex1.length < hex2.length)
hex1 = '0' + hex1;
sobra = 0;
resultado = "";
for(x = hex1.length-1; x>=0; x--) {
if (hex1.charAt(x) > '9') op1 = hex1.charCodeAt(x)-hexchr.charCodeAt(10)+10;
else op1 = hex1.charCodeAt(x)-hexchr.charCodeAt(0);
if (hex2.charAt(x) > '9') op2 = hex2.charCodeAt(x)-hexchr.charCodeAt(10)+10;
else op2 = hex2.charCodeAt(x)-hexchr.charCodeAt(0);
r = op1 + op2 + sobra;
if (r > 15) {
r -= 16;
sobra = 1;
} else sobra = 0;
resultado = hexchr.charAt(r) + resultado;
}
if (sobra == 1)
resultado = "1" + resultado;
return resultado;
}
/*
*hex1 e hex2 sao strings hexa
*devolve a string que representa hex2 - hex1
*/
function bighexsub (hex1, hex2) {
if (hex1.length == hex2.length) {
i=0;
while (hex1.charAt(i) == hex2.charAt(i) && i<hex1.length) i++;
if (i>=hex1.length) return 0;
if (hex1.charAt(i) > hex2.charAt(i)) {
sinal="";
a = hex2;
hex2 = hex1;
hex1 = a;
} else sinal = "-";
}
else {
if (hex1.length < hex2.length) sinal="-";
else {
sinal="";
a = hex2;
hex2 = hex1;
hex1 = a;
}
while (hex1.length < hex2.length)
hex1 = "0" + hex1;
}
sobra = 0;
resultado = "";
for(x=hex1.length-1; x>=0; x--) {
if (hex1.charAt(x) > '9') op1 = hex1.charCodeAt(x)-hexchr.charCodeAt(10)+10;
else op1 = hex1.charCodeAt(x)-hexchr.charCodeAt(0);
if (hex2.charAt(x) > '9') op2 = hex2.charCodeAt(x)-hexchr.charCodeAt(10)+10;
else op2 = hex2.charCodeAt(x)-hexchr.charCodeAt(0);
r = op2 - op1 - sobra;
if (r < 0) {
r += 16;
sobra = 1;
} else sobra = 0;
resultado = hexchr.charAt(r) + resultado;
}
return sinal + resultado;
}
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