[20250701] BOJ / G4 / 램프 / 김수연 #405
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🧷 문제 링크
https://www.acmicpc.net/problem/1034
🧭 풀이 시간
30분
👀 체감 난이도
✏️ 문제 설명
탁자에 있는 램프의 상태와 스위치 누르는 횟수 K가 주어졌을 때, 스위치를 K번 누른 후 켜져있는 행의 최댓값 구하기
(스위치 누르면 열에 있는 램프의 상태가 변함)
🔍 풀이 방법
K값이 짝수개면 0의 개수가 짝수인 곳의 행 전부 1로 만들 수 있음
홀수면 0의 개수가 홀수인 곳의 행 전부 1로 만들 수 있음
HashMap으로 동일하게 등장하는 값 카운팅해줌
⏳ 회고
간단히 생각하면 쉬움