int getTwistSym() {
if (TwistR2S != null) {
return TwistR2S[getTwist()];
}
if (temps == null) {
temps = new CubieCube();
}
for (int k = 0; k < 16; k += 2) {
CornConjugate(this, SymInv[k], temps);
int idx = Util.binarySearch(TwistS2R, temps.getTwist());
if (idx != 0xffff) {
return (idx << 3) | (k >> 1);
}
}
return 0;
}
static void initTwistSym2Raw() {
CubieCube c = new CubieCube();
CubieCube d = new CubieCube();
int[] occ = new int[2187 / 32 + 1];
int count = 0;
for (int i = 0; i < 2187 / 32 + 1; occ[i++] = 0) ;
TwistR2S = new char[2187];
for (int i = 0; i < 2187; i++) {
if ((occ[i >> 5] & (1 << (i & 0x1f))) == 0) {
c.setTwist(i);
for (int s = 0; s < 16; s += 2) {
CornConjugate(c, s, d);
int idx = d.getTwist();
if (idx == i) {
SymStateTwist[count] |= 1 << (s >> 1);
}
occ[idx >> 5] |= 1 << (idx & 0x1f);
TwistR2S[idx] = (char) ((count << 3) | (s >> 1));
}
TwistS2R[count++] = (char) i;
}
}
}
