Package g0901_1000.s0947_most_stones_removed_with_same_row_or_column

Class Solution

java.lang.Object
g0901_1000.s0947_most_stones_removed_with_same_row_or_column.Solution
public class Solution extends java.lang.Object
947 - Most Stones Removed with Same Row or Column.

Medium

On a 2D plane, we place n stones at some integer coordinate points. Each coordinate point may have at most one stone.

A stone can be removed if it shares either the same row or the same column as another stone that has not been removed.

Given an array stones of length n where stones[i] = [xi, yi] represents the location of the ith stone, return the largest possible number of stones that can be removed.

Example 1:

Input: stones = [[0,0],[0,1],[1,0],[1,2],[2,1],[2,2]]

Output: 5

Explanation: One way to remove 5 stones is as follows:

  1. Remove stone [2,2] because it shares the same row as [2,1].
  2. Remove stone [2,1] because it shares the same column as [0,1].
  3. Remove stone [1,2] because it shares the same row as [1,0].
  4. Remove stone [1,0] because it shares the same column as [0,0].
  5. Remove stone [0,1] because it shares the same row as [0,0].

Stone [0,0] cannot be removed since it does not share a row/column with another stone still on the plane.

Example 2:

Input: stones = [[0,0],[0,2],[1,1],[2,0],[2,2]]

Output: 3

Explanation: One way to make 3 moves is as follows:

  1. Remove stone [2,2] because it shares the same row as [2,0].

  2. Remove stone [2,0] because it shares the same column as [0,0].

  3. Remove stone [0,2] because it shares the same row as [0,0].

Stones [0,0] and [1,1] cannot be removed since they do not share a row/column with another stone still on the plane.

Example 3:

Input: stones = [[0,0]]

Output: 0

Explanation: [0,0] is the only stone on the plane, so you cannot remove it.

Constraints:

  • 1 <= stones.length <= 1000
  • 0 <= xi, yi <= 104
  • No two stones are at the same coordinate point.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    removeStones(int[][] stones)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • removeStones

      public int removeStones(int[][] stones)