Problem:
Score : 300 points

Problem Statement

There are N balls in a two-dimensional plane. The i-th ball is at coordinates (x_i, y_i).

We will collect all of these balls, by choosing two integers p and q such that p \neq 0 or q \neq 0 and then repeating the following operation:

Choose a ball remaining in the plane and collect it. Let (a, b) be the coordinates of this ball. If we collected a ball at coordinates (a - p, b - q) in the previous operation, the cost of this operation is 0. Otherwise, including when this is the first time to do this operation, the cost of this operation is 1.

Find the minimum total cost required to collect all the balls when we optimally choose p and q.

Constraints

1 \leq N \leq 50

|x_i|, |y_i| \leq 10^9

If i \neq j, x_i \neq x_j or y_i \neq y_j.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
x_1 y_1
:
x_N y_N

Output

Print the minimum total cost required to collect all the balls.

Sample Input 1

2
1 1
2 2

Sample Output 1

1

If we choose p = 1, q = 1, we can collect all the balls at a cost of 1 by collecting them in the order (1, 1), (2, 2).

Sample Input 2

3
1 4
4 6
7 8

Sample Output 2

1

If we choose p = -3, q = -2, we can collect all the balls at a cost of 1 by collecting them in the order (7, 8), (4, 6), (1, 4).

Sample Input 3

4
1 1
1 2
2 1
2 2

Sample Output 3

2

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.InputStream;
import java.io.PrintStream;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class Main {

  public static void main(String[] args) {
    solve(System.in, System.out);
  }

  private static class Pair {

    int x;
    int y;

    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      Pair pair = (Pair) o;
      return x == pair.x &&
          y == pair.y;
    }

    @Override
    public int hashCode() {
      return Objects.hash(x, y);
    }
  }

  private static class Vert {
    int x;
    int y;

    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      Vert pair = (Vert) o;
      return x == pair.x &&
          y == pair.y;
    }

    @Override
    public int hashCode() {
      return Objects.hash(x, y);
    }
  }

  static void solve(InputStream is, PrintStream os) {
    Scanner sc = new Scanner(is);

    /* read */
    int n = sc.nextInt();

    if (n == 1) {
      os.println(1);
      return;
    }

    List<Pair> pairs = new ArrayList<>(n);

    int[] x = new int[n];
    int[] y = new int[n];

    for (int i = 0; i < n; i++) {
      x[i] = sc.nextInt();
      y[i] = sc.nextInt();
      Pair pair = new Pair();
      pair.x = x[i];
      pair.y = y[i];
      pairs.add(pair);
    }

    Map<Vert, Integer> occurs = new HashMap<>();
    for (int i = 0 ; i < n; i++) {
      for (int j = 0; j < n; j++){
        if (i == j) continue;
        Vert v = new Vert();
        Pair p1 = pairs.get(i);
        Pair p2 = pairs.get(j);
        v.x = p1.x - p2.x;
        v.y = p1.y - p2.y;
        int occur = occurs.getOrDefault(v, 0);
        occur++;
        occurs.put(v, occur);
      }
    }

    Vert maxOccurVert = null;
    int maxOccur = Integer.MIN_VALUE;
    for (Vert v : occurs.keySet()) {
      if (occurs.get(v) > maxOccur) {
        maxOccurVert = v;
        maxOccur = occurs.get(v);
      }
    }

    os.println(n - 1 - maxOccur + 1);
  }

//  private static class Pair {
//
//    int x;
//    int y;
//
//    @Override
//    public boolean equals(Object o) {
//      if (this == o) {
//        return true;
//      }
//      if (o == null || getClass() != o.getClass()) {
//        return false;
//      }
//      Pair pair = (Pair) o;
//      return x == pair.x &&
//          y == pair.y;
//    }
//
//    @Override
//    public int hashCode() {
//      return Objects.hash(x, y);
//    }
//  }
//
//  static void solve(InputStream is, PrintStream os) {
//    Scanner sc = new Scanner(is);
//
//    /* read */
//    int n = sc.nextInt();
//
//    List<Pair> pairs = new ArrayList<>(n);
//
//    int[] x = new int[n];
//    int[] y = new int[n];
//
//    for (int i = 0; i < n; i++) {
//      x[i] = sc.nextInt();
//      y[i] = sc.nextInt();
//      Pair pair = new Pair();
//      pair.x = x[i];
//      pair.y = y[i];
//      pairs.add(pair);
//    }
//
//    // first, pick up (i, i)
//    int costMin = Integer.MAX_VALUE;
//    for (int i = 0; i < n; i++) {
//      // next pick up
//      for (int j = i + 1; j < n; j++) {
//        List<Pair> remain = new LinkedList<>(pairs);
//        Pair first = remain.get(i);
//        Pair second = remain.get(j);
//        remain.remove(first);
//        remain.remove(second);
//        int p = second.x - first.x;
//        int q = second.y - first.y;
//
//        Pair last = second;
//        int cost = 0;
//        while (!remain.isEmpty()) {
//          Pair next = null;
//          for (Pair cand : remain) {
//            if (last.x == cand.x - p && last.y == cand.y - q) {
//              next = cand;
//              break;
//            }
//          }
//          if (next == null) {
//            cost++;
//            if (p > 0) {
//              if (q > 0) {
//                remain.sort((p1, p2) -> p1.x != p2.x ? Integer.compare(p1.x, p2.x) : Integer.compare(p1.y, p2.y));
//              } else {
//                remain.sort((p1, p2) -> p1.x != p2.x ? Integer.compare(p1.x, p2.x) : -Integer.compare(p1.y, p2.y));
//              }
//            } else {
//              if (q > 0) {
//                remain.sort((p1, p2) -> p1.x != p2.x ? -Integer.compare(p1.x, p2.x) : Integer.compare(p1.y, p2.y));
//              } else {
//                remain.sort((p1, p2) -> p1.x != p2.x ? -Integer.compare(p1.x, p2.x) : -Integer.compare(p1.y, p2.y));
//              }
//            }
//            last = remain.get(0);
//            remain.remove(0);
//          } else {
//            last = next;
//            remain.remove(last);
//          }
//        }
//        costMin = Math.min(cost, costMin);
//      }
//    }
//    os.println(costMin + 1);
//  }
}