From 7e444d46f785a03d0de8db94b87c3ecc88163487 Mon Sep 17 00:00:00 2001 From: Jonghwan Lee <123362165+0224LJH@users.noreply.github.com> Date: Sat, 16 Aug 2025 23:57:26 +0900 Subject: [PATCH] =?UTF-8?q?[20250816]=20BOJ=20/=20G5=20/=20=EA=B0=80?= =?UTF-8?q?=EC=9E=A5=20=ED=81=B0=20=EA=B0=92=20/=20=EC=9D=B4=EC=A2=85?= =?UTF-8?q?=ED=99=98?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...\354\236\245 \355\201\260 \352\260\222.md" | 61 +++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 "0224LJH/16 BOJ \352\260\200\354\236\245 \355\201\260 \352\260\222.md" diff --git "a/0224LJH/16 BOJ \352\260\200\354\236\245 \355\201\260 \352\260\222.md" "b/0224LJH/16 BOJ \352\260\200\354\236\245 \355\201\260 \352\260\222.md" new file mode 100644 index 00000000..ca8e8939 --- /dev/null +++ "b/0224LJH/16 BOJ \352\260\200\354\236\245 \355\201\260 \352\260\222.md" @@ -0,0 +1,61 @@ +```java +import java.io.*; +import java.util.*; + +public class Main { + + static int NEG_INF = Integer.MIN_VALUE / 4; + static int size,groupCnt; + static int[] a; + + public static void main(String[] args) throws Exception { + init(); + process(); + + } + + public static void init() throws IOException { + BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); + StringTokenizer st = new StringTokenizer(br.readLine()); + size = Integer.parseInt(st.nextToken()); + groupCnt = Integer.parseInt(st.nextToken()); + + a = new int[size + 1]; + st = new StringTokenizer(br.readLine()); + for (int i = 1; i <= size; i++) a[i] = Integer.parseInt(st.nextToken()); + } + + public static void process(){ + + int[] prefixSum = new int[size + 1]; + for (int i = 1; i <= size; i++) prefixSum[i] = prefixSum[i - 1] + a[i]; + + + int[][] dp = new int[size + 1][groupCnt + 1]; + for (int i = 0; i <= size; i++) { + Arrays.fill(dp[i], NEG_INF); + dp[i][0] = 0; + } + dp[0][0] = 0; + + // dp[i][j] = max(dp[i-1][j], max_s(dp[s-1][j-1] + (ps[i]-ps[s-1]))) + // = max(dp[i-1][j], (max_s(dp[s-1][j-1] - ps[s-1])) + ps[i]) + for (int j = 1; j <= groupCnt; j++) { + int best = NEG_INF; + for (int i = 1; i <= size; i++) { + best = Math.max(best, dp[i - 1][j - 1] - prefixSum[i - 1]); + + dp[i][j] = Math.max(dp[i][j], dp[i - 1][j]); + + if (best > NEG_INF) { + dp[i][j] = Math.max(dp[i][j], best + prefixSum[i]); + } + } + } + + System.out.println(dp[size][groupCnt]); + } +} + + +``` \ No newline at end of file