From 870bcc5e93ba5eeade3672d80d0f55b4148275f2 Mon Sep 17 00:00:00 2001 From: LiiNi-coder <97495437+LiiNi-coder@users.noreply.github.com> Date: Sun, 27 Jul 2025 23:51:08 +0900 Subject: [PATCH] =?UTF-8?q?[20250727]=20BOJ=20/=20G4=20/=20=EC=88=98?= =?UTF-8?q?=EB=93=A4=EC=9D=98=20=ED=95=A9=204=20/=20=EC=9D=B4=EC=9D=B8?= =?UTF-8?q?=ED=9D=AC?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...353\223\244\354\235\230 \355\225\251 4.md" | 38 +++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 "LiiNi-coder/202507/27 BOJ \354\210\230\353\223\244\354\235\230 \355\225\251 4.md" diff --git "a/LiiNi-coder/202507/27 BOJ \354\210\230\353\223\244\354\235\230 \355\225\251 4.md" "b/LiiNi-coder/202507/27 BOJ \354\210\230\353\223\244\354\235\230 \355\225\251 4.md" new file mode 100644 index 00000000..ad1ec6cd --- /dev/null +++ "b/LiiNi-coder/202507/27 BOJ \354\210\230\353\223\244\354\235\230 \355\225\251 4.md" @@ -0,0 +1,38 @@ +```java +import java.io.*; +import java.util.*; + +public class Main { + private static BufferedReader br; + private static StringTokenizer st; + private static int n, k; + private static int[] arr; + + public static void main(String[] args) throws IOException { + br = new BufferedReader(new InputStreamReader(System.in)); + st = new StringTokenizer(br.readLine()); + + n = Integer.parseInt(st.nextToken()); + k = Integer.parseInt(st.nextToken()); + + arr = new int[n]; + st = new StringTokenizer(br.readLine()); + for (int i = 0; i < n; i++) + arr[i] = Integer.parseInt(st.nextToken()); + + Map prefixCount = new HashMap<>(); + prefixCount.put(0L, 1); + long sum = 0; + long answer = 0; + for (int i = 0; i < n; i++) { + sum += arr[i]; + answer += prefixCount.getOrDefault(sum - k, 0); + prefixCount.put(sum, prefixCount.getOrDefault(sum, 0) + 1); + //System.out.println(sum); + //System.out.println(answer); + } + + System.out.println(answer); + } +} +```