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Formatted question description: https://leetcode.ca/all/2260.html

2260. Minimum Consecutive Cards to Pick Up

  • Difficulty: Medium.
  • Related Topics: Array, Hash Table, Sliding Window.
  • Similar Questions: Longest Substring Without Repeating Characters.

Problem

You are given an integer array cards where cards[i] represents the value of the ith card. A pair of cards are matching if the cards have the same value.

Return** the minimum number of consecutive cards you have to pick up to have a pair of matching cards among the picked cards.** If it is impossible to have matching cards, return -1.

  Example 1:

Input: cards = [3,4,2,3,4,7]
Output: 4
Explanation: We can pick up the cards [3,4,2,3] which contain a matching pair of cards with value 3. Note that picking up the cards [4,2,3,4] is also optimal.

Example 2:

Input: cards = [1,0,5,3]
Output: -1
Explanation: There is no way to pick up a set of consecutive cards that contain a pair of matching cards.

  Constraints:

  • 1 <= cards.length <= 105

  • 0 <= cards[i] <= 106

Solution (Java, C++, Python)

  • class Solution {
    public int minimumCardPickup(int[] cards) {
        int mindiff = Integer.MAX_VALUE;
        Map<Integer, Integer> map = new HashMap<>();
        int n = cards.length;
        for (int i = 0; i < n; i++) {
            if (map.containsKey(cards[i])) {
                int j = map.get(cards[i]);
                mindiff = Math.min(mindiff, i - j + 1);
            }
            map.put(cards[i], i);
        }
        if (mindiff == Integer.MAX_VALUE) {
            return -1;
        }
        return mindiff;
    }
}

  • Todo

  • class Solution:
    def minimumCardPickup(self, cards: List[int]) -> int:
        m = {}
        ans = 10**6
        for i, c in enumerate(cards):
            if c in m:
                ans = min(ans, i - m[c] + 1)
            m[c] = i
        return -1 if ans == 10**6 else ans

############

# 2260. Minimum Consecutive Cards to Pick Up
# https://leetcode.com/problems/minimum-consecutive-cards-to-pick-up/

class Solution:
    def minimumCardPickup(self, cards: List[int]) -> int:
        res = float('inf')
        last = {}
        
        for j, x in enumerate(cards):
            if x in last:
                res = min(res, j - last[x] + 1)
                
            last[x] = j
        
        
        return -1 if res == float('inf') else res

Explain:

nope.

Complexity:

  • Time complexity : O(n).
  • Space complexity : O(n).

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