int main()
{
double x1, x2, y1, y2,dis;
scanf("%lf %lf", &x1, &y1);
scanf("%lf %lf", &x2, &y2);
dis = get_sq(x1, y1, x2, y2);
printf("%.4lf\n", sqrt(dis));
return 0;
}
int set_pos(struct Position* pos, char* fen)
{
u32 piece, pt, sq, pc,
tsq = 0,
index = 0;
char c;
pos->state->pos_key = 0ULL;
pos->state->pawn_key = 0ULL;
for (sq = 0; sq < 64; ++sq)
castle_perms[sq] = 15;
while (tsq < 64) {
sq = tsq ^ 56;
c = fen[index++];
if (c == ' ') {
break;
} else if (c > '0' && c < '9') {
tsq += (c - '0');
} else if (c == '/') {
continue;
} else {
piece = get_piece_from_char(c);
pt = piece & 7;
pc = piece >> 3;
put_piece(pos, sq, pt, pc);
if (pt == KING) {
pos->king_sq[pc] = sq;
castle_perms[sq] = pc == WHITE ? 12 : 3;
} else if (pt == ROOK && !is_frc) {
if (sq == H1 || sq == H8) {
castling_rook_pos[pc][KINGSIDE] = sq;
castle_perms[sq] = pc == WHITE ? 14 : 11;
} else if (sq == A1 || sq == A8) {
castling_rook_pos[pc][QUEENSIDE] = sq;
castle_perms[sq] = pc == WHITE ? 13 : 7;
}
}
++tsq;
}
}
++index;
pos->stm = fen[index] == 'w' ? WHITE : BLACK;
index += 2;
int file, rank, color;
while ((c = fen[index++]) != ' ') {
if (c == '-') {
++index;
break;
} else if (!is_frc) {
pos->state->castling_rights |= get_cr_from_char(c);
} else {
if (c >= 'a' && c <= 'z') {
color = BLACK;
rank = RANK_8;
file = c - 'a';
} else if (c >= 'A' && c <= 'Z') {
color = WHITE;
rank = RANK_1;
file = c - 'A';
}
u32 cr = get_cr_from_char(c);
if (cr != -1) {
u64 r_bb = pos->bb[ROOK] & pos->bb[color];
int ksq = pos->king_sq[color];
int kside_sq, qside_sq = 0;
while (r_bb) {
kside_sq = bitscan(r_bb);
r_bb &= r_bb - 1;
if (is_queenside(ksq, kside_sq))
qside_sq = kside_sq;
if (qside_sq && kside_sq != qside_sq)
break;
}
if (cr & (WKC | BKC)) {
castling_rook_pos[color][KINGSIDE] = kside_sq;
castle_perms[kside_sq] = color == WHITE ? 14 : 11;
pos->state->castling_rights |= color == WHITE ? WKC : BKC;
} else if (cr & (WQC | BQC)) {
castling_rook_pos[color][QUEENSIDE] = qside_sq;
castle_perms[qside_sq] = color == WHITE ? 13 : 7;
pos->state->castling_rights |= color == WHITE ? WQC : BQC;
}
} else {
sq = get_sq(rank, file);
if (is_kingside(pos->king_sq[color], sq)) {
castling_rook_pos[color][KINGSIDE] = sq;
castle_perms[sq] = color == WHITE ? 14 : 11;
pos->state->castling_rights |= color == WHITE ? WKC : BKC;
} else if (is_queenside(pos->king_sq[color], sq)) {
castling_rook_pos[color][QUEENSIDE] = sq;
castle_perms[sq] = color == WHITE ? 13 : 7;
pos->state->castling_rights |= color == WHITE ? WQC : BQC;
}
}
}
}
pos->state->pos_key ^= castle_keys[pos->state->castling_rights];
u32 ep_sq = 0;
if ((c = fen[index++]) != '-') {
ep_sq = (c - 'a') + ((fen[index++] - '1') << 3);
pos->state->pos_key ^= psq_keys[0][0][ep_sq];
pos->state->ep_sq_bb = BB(ep_sq);
}
++index;
u32 x = 0;
while ((c = fen[index++]) != '\n' && c != ' ' && c != '\0')
x = x * 10 + (c - '0');
pos->state->fifty_moves = x;
x = 0;
while ((c = fen[index++]) != '\n' && c != ' ' && c != '\0')
x = x * 10 + (c - '0');
pos->state->full_moves = x;
return index;
}
