[20250816] BOJ / G5 / 가장 큰 값 / 이종환

0224LJH/16 BOJ 가장 큰 값.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]);
+    }
+}
+
+
+```