[20250306] BOJ / P5 / 무서운 아르바이트 / 권혁준

khj20006/202503/06 BOJ P5 무서운 아르바이트.md

@@ -0,0 +1,83 @@
+```java
+
+import java.util.*;
+import java.io.*;
+
+
+class Main {
+
+	// IO field
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	static StringTokenizer st;
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	static long nextLong() {return Long.parseLong(st.nextToken());}
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+
+	// Additional field
+
+	static int N;
+	static int[] r, A;
+	static long[] C;
+	static boolean[] V;
+	static int[][] info;
+
+	static int f(int x) {return x==r[x] ? x : (r[x]=f(r[x]));}
+
+	public static void main(String[] args) throws Exception {
+
+		ready();
+		solve();
+
+		bwEnd();
+
+	}
+
+	static void ready() throws Exception{
+
+		N = Integer.parseInt(br.readLine());
+		A = new int[N];
+		r = new int[N];
+		C = new long[N];
+		V = new boolean[N];
+		info = new int[N][2];
+		nextLine();
+		for(int i=0;i<N;i++) {
+			A[i] = nextInt();
+			r[i] = i;
+			C[i] = 1;
+			info[i][0] = A[i];
+			info[i][1] = i;
+		}
+		Arrays.sort(info, (a,b) -> b[0]-a[0]);
+
+	}
+
+	static void solve() throws Exception{
+
+		long ans = 0;
+		for(int[] n:info) {
+			int val = n[0], idx = n[1];
+			V[idx] = true;
+			if(idx > 0 && V[idx-1]) {
+				int x = f(idx-1), y = f(idx);
+				C[y] += C[x];
+				r[x] = y;
+			}
+
+			if(idx < N-1 && V[idx+1]) {
+				int x = f(idx+1), y = f(idx);
+				C[y] += C[x];
+				r[x] = y;
+			}
+
+			ans = Math.max(ans, C[f(idx)] * val);
+		}
+		bw.write(ans + "\n");
+	}
+
+}
+
+```