[20251204] BOJ / G4 / 수들의 합 4 / 강신지 #1584
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🧷 문제 링크
https://www.acmicpc.net/problem/2015
🧭 풀이 시간
50분
👀 체감 난이도
✏️ 문제 설명
수열에서 연속된 부분 구간을 골랐을 때, 그 구간의 합이 정확히 K가 되는 경우의 수를 계산하는 문제
🔍 풀이 방법
누적합을 계산하며 현재 누적합 sum 에 대해 sum - K 가 이전에 몇 번 등장했는지 해시맵에서 찾아 그 횟수를 정답에 더하기
⏳ 회고
누적합에 해시맵 생각하기 어려웠다