[20250319] BOJ / 골드1 / 가계부 / 이강현 #267
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🧷 문제 링크
https://www.acmicpc.net/problem/12837
🧭 풀이 시간
15분
👀 체감 난이도
✏️ 문제 설명
구간 합 구하기, 수정 추가
🔍 풀이 방법
세그먼트 트리
⏳ 회고
구간 합 구하기랑 똑같은 문제. 리프 노드의 변화량을 그냥 줘서 더 쉬움