[20250320] BOJ / G5 / 주식 / 권혁준

khj20006/202503/20 BOJ G5 주식.md

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+```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 = new StringTokenizer("");
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static String nextToken() throws Exception {
+		if(!st.hasMoreTokens()) nextLine();
+		return st.nextToken();
+	}
+	static int nextInt() throws Exception { return Integer.parseInt(nextToken()); }
+	static long nextLong() throws Exception { return Long.parseLong(nextToken()); }
+	static double nextDouble() throws Exception { return Double.parseDouble(nextToken()); }
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+
+	// Additional field
+
+	static int N, M, K;
+	static long[] p;
+	static long ans;
+
+	public static void main(String[] args) throws Exception {
+
+		ready();
+		solve();
+
+		bwEnd();
+
+	}
+
+	static void ready() throws Exception{
+
+		N = nextInt();
+		M = nextInt();
+		K = nextInt()+1;
+		p = new long[N];
+		for(int i=0;i<N;i++) p[i] = nextInt();
+
+	}
+
+	static void solve() throws Exception{
+
+		ans = M;
+		bck(M,0,0,0);
+		bw.write(ans + "\n");
+
+	}
+
+	static void bck(long curMoney, long borrow, long count, int day) {
+		if(day == N) {
+			ans = Math.max(ans, curMoney);
+			return;
+		}
+		if(count > 0) {
+			bck(curMoney, borrow, count, day+1);
+			long benefit = count * p[day];
+			curMoney += benefit;
+			ans = Math.max(ans, curMoney);
+			curMoney -= borrow;
+			if(curMoney < 0) return;
+			borrow = 0;
+			count = 0;
+		}
+		bck(curMoney, borrow, count, day+1);
+		borrow = curMoney * (K-1);
+		curMoney *= K;
+		count = curMoney / p[day];
+		curMoney -= count * p[day];
+		if(count > 0) bck(curMoney, borrow, count, day+1);
+
+	}
+
+}
+
+```