Submission #1108593

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Source Code Expand

int[Point] up;
int[Point] down;
int[Point] right;
int[Point] left;

Point move(Point p, char dir) {
    auto np = p;
    
    if (dir == 'U')      np.y = up[p];
    else if (dir == 'D') np.y = down[p];
    else if (dir == 'R') np.x = right[p];
    else if (dir == 'L') np.x = left[p];
    else assert(true);

    Point u = Point(np.x, np.y+1);
    Point d = Point(np.x, np.y-1);
    Point r = Point(np.x+1, np.y);
    Point l = Point(np.x-1, np.y);
    int nu = (u in up)    ? up[u]    : np.y + 1;
    int nd = (d in down)  ? down[d]  : np.y - 1;
    int nr = (r in right) ? right[r] : np.x + 1;
    int nl = (l in left)  ? left[l]  : np.x - 1;

    up[Point(np.x, nd+1)] = nu;
    down[Point(np.x, nu-1)] = nd;
    right[Point(nl+1, np.y)] = nr;
    left[Point(nr-1, np.y)] = nl;

    up[np] = nu;
    down[np] = nd;
    right[np] = nr;
    left[np] = nl;

    return np;
}

void main() {
    auto K = readln.chomp.to!int;
    auto S = readln.chomp;

    Point p = Point(0, 0);
    up[p] = 1;
    down[p] = -1;
    right[p] = 1;
    left[p] = -1;

    foreach (i; 0..K) {
        p = move(p, S[i]);
    }

    writeln(p[0], " ", p[1]);
}

Submission Info

Compile Error

./Main.d(1): Error: undefined identifier Point
./Main.d(2): Error: undefined identifier Point
./Main.d(3): Error: undefined identifier Point
./Main.d(4): Error: undefined identifier Point
./Main.d(6): Error: undefined identifier Point
./Main.d(6): Error: undefined identifier Point