public void Solve()
{
int N = Reader.Int();
int[] X = new int[N], V = new int[N];
for (int i = 0; i < N; i++)
{
X[i] = Reader.Int(); V[i] = Reader.Int();
}
V = Compress(V);
Array.Sort(X, V);
int[] L = new int[N], R = new int[N];
for (int i = 0, max = -1; i < N; i++)
{
R[i] = max = Math.Max(max, V[i] + 1);
}
for (int i = N - 1, min = int.MaxValue; i >= 0; i--)
{
L[i] = min = Math.Min(min, V[i]);
}
var BIT = new BinaryIndexedTree(N + 1, Mod);
BIT.Add(0, 1);
for (int i = 0; i < N; i++)
{
BIT.Add(R[i], BIT.Sum(L[i], R[i] + 1));
}
Console.WriteLine(BIT.Sum(N, N + 1));
}
string Solve(int N, int[] who, int[] index)
{
Array.Sort(index, who);
var ans = new int[N * N];
int L = 0;
var bit = new BinaryIndexedTree(N * N);
for (int i = 0; i < N * N; i++)
{
bit.Add(i, 1);
}
for (int i = 0; i < N; i++)
{
if (bit.Sum(index[i]) < who[i])
{
return(No);
}
ans[index[i]] = who[i];
bit.Add(index[i], -1);
int num = who[i] - 1;
for (; L < ans.Length && num > 0; L++)
{
if (ans[L] == 0)
{
num--;
bit.Add(L, -1);
ans[L] = who[i];
}
}
if (num > 0)
{
return(No);
}
}
for (int i = 0; i < N; i++)
{
for (int num = N - who[i]; L < ans.Length && num > 0; L++)
{
if (ans[L] == 0)
{
if (L < index[i])
{
return(No);
}
ans[L] = who[i];
num--;
}
}
}
return(Yes + "\n" + string.Join(" ", ans));
}
void Solve()
{
var S = Console.ReadLine();
var N = S.Length;
var s = S.Select(c => c - '0').ToArray();
var bit = new BinaryIndexedTree(s);
int k = 0, l = 0, r = N;
while (true)
{
var t = bit.Sum(l, r);
if (t == 0 || t == r - l)
{
break;
}
bit.Add(l, -s[l]);
bit.Add(r - 1, -s[r - 1]);
l++; r--; k++;
}
Console.WriteLine(N - k);
}
void Solve()
{
var N = F();
var B = G();
var rev = new int[N];
var bit = new BinaryIndexedTree(N);
for (var i = 0; i < N; i++)
{
rev[--B[i]] = i;
bit.Add(i, 1);
}
var s = 0L;
for (var i = 0; i < N; i++)
{
s += Min(bit.Sum(0, rev[i]), bit.Sum(rev[i] + 1, N));
bit.Add(rev[i], -1);
}
WriteLine(s);
}
public void TestMethod1()
{
int[] A = { 2, 1, 1, 3, 2, 3, 4, 5, 6, 7, 8, 9 };
BinaryIndexedTree biTree = new BinaryIndexedTree(A);
var sum = biTree.GetSum(5);
Assert.AreEqual(12, sum);
biTree.Add(3, 6);
sum = biTree.GetSum(5);
Assert.AreEqual(18, sum);
}
public long countColoring(int n, int xzero, int xmul, int xadd, int xmod, int yzero, int ymul, int yadd, int ymod)
{
int[] xs = new int[n], ys = new int[n];
Point[] points = new Point[n];
xs[0] = xzero;
ys[0] = yzero;
points[0] = new Point(xs[0], ys[0]);
for (int i = 1; i < n; ++i) {
xs[i] = (int)(((long)points[i - 1].X * xmul + xadd) % xmod);
ys[i] = (int)(((long)points[i - 1].Y * ymul + yadd) % ymod);
points[i] = new Point(xs[i], ys[i]);
}
Array.Sort(xs);
Array.Sort(ys);
for (int i = 0; i < n; ++i) {
points[i].X = Array.BinarySearch(xs, points[i].X) + 1;
points[i].Y = Array.BinarySearch(ys, points[i].Y) + 1;
}
Array.Sort(points);
long count = 0;
BinaryIndexedTree tree;
tree = new BinaryIndexedTree(n);
int[] countL = new int[n], countR = new int[n];
for (int i = 0; i < n; ++i) {
countL[i] = tree.Sum(points[i].Y);
tree.Add(points[i].Y, 1);
}
tree = new BinaryIndexedTree(n);
for (int i = n - 1; i >= 0; --i) {
countR[i] = tree.Sum(n) - tree.Sum(points[i].Y);
count += (long)countR[i] * (countR[i] - 1) / 2;
count -= (long)countL[i] * countR[i];
tree.Add(points[i].Y, 1);
}
return count;
}
void Solve()
{
var N = F();
var A = G();
var B = G();
var rev = new int[N];
for (var i = 0; i < N; i++)
{
rev[--A[i]] = i;
}
for (var i = 0; i < N; i++)
{
B[i] = rev[B[i] - 1];
}
var inv = new int[N];
var s = 0L;
var bit = new BinaryIndexedTree(N);
for (var i = 0; i < N; i++)
{
s += inv[B[i]] = bit.Sum(B[i], N);
bit.Add(B[i], 1);
}
if (s % 2 == 1)
{
Console.WriteLine(-1);
}
else
{
if (s > 0)
{
s /= 2;
var done = 0;
while (s >= inv[done])
{
s -= inv[done++];
}
var k = N - 1;
for (var j = N - 1; j >= done; j--)
{
while (B[k] < done)
{
k--;
}
B[j] = B[k--];
}
for (var j = 0; j < done; j++)
{
B[j] = j;
}
for (var j = done; s > 0 && j < N; j++)
{
for (k = N - 1; s > 0 && k > j; k--)
{
if (B[k - 1] > B[k])
{
var t = B[k];
B[k] = B[k - 1];
B[k - 1] = t;
s--;
}
}
}
}
for (var i = 0; i < N; i++)
{
B[i] = A[B[i]] + 1;
}
Console.WriteLine(string.Join(" ", B));
}
}
