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[9/9] 1996. The Number of Weak Characters in the Game
본문
Medium
232380Add to ListShareYou are playing a game that contains multiple characters, and each of the characters has two main properties: attack and defense. You are given a 2D integer array properties where properties[i] = [attacki, defensei] represents the properties of the ith character in the game.
A character is said to be weak if any other character has both attack and defense levels strictly greater than this character's attack and defense levels. More formally, a character i is said to be weak if there exists another character j where attackj > attacki and defensej > defensei.
Return the number of weak characters.
Example 1:
Input: properties = [[5,5],[6,3],[3,6]] Output: 0 Explanation: No character has strictly greater attack and defense than the other.
Example 2:
Input: properties = [[2,2],[3,3]] Output: 1 Explanation: The first character is weak because the second character has a strictly greater attack and defense.
Example 3:
Input: properties = [[1,5],[10,4],[4,3]] Output: 1 Explanation: The third character is weak because the second character has a strictly greater attack and defense.
Constraints:
2 <= properties.length <= 105properties[i].length == 21 <= attacki, defensei <= 105
Accepted
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Submissions
169,691
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Runtime: 2730 ms, faster than 80.70% of Python3 online submissions for The Number of Weak Characters in the Game.
Memory Usage: 70.9 MB, less than 7.38% of Python3 online submissions for The Number of Weak Characters in the Game.
Memory Usage: 70.9 MB, less than 7.38% of Python3 online submissions for The Number of Weak Characters in the Game.
from collections import defaultdict
class Solution:
def numberOfWeakCharacters(self, properties: List[List[int]]) -> int:
a_to_d = defaultdict(list)
res = 0
max_d = -1
for a, d in properties:
a_to_d[a].append(d)
for key in sorted(list(a_to_d.keys()), reverse=True):
for d in a_to_d[key]:
if d < max_d: res += 1
max_d = max(max_d, max(a_to_d[key]))
return res
