[20251002] BOJ / G4 / 사탕 가게 / 김수연

suyeun84/202510/02 BOJ G4 사탕 가게.md

@@ -0,0 +1,48 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class boj4781 {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static StringTokenizer st;
+    static void nextLine() throws Exception { st = new StringTokenizer(br.readLine()); }
+    static int nextInt() { return Integer.parseInt(st.nextToken()); }
+    static double nextDouble() { return Double.parseDouble(st.nextToken()); }
+
+    public static void main(String[] args) throws Exception {
+        while(true) {
+            nextLine();
+            int n = nextInt(); // 사탕 종류의 수
+            int m = (int) (nextDouble() * 100); // 상근이 돈 양
+            if (n == 0 && m == 0) break;
+            Candy[] candy = new Candy[n+1];
+            for (int i = 1; i <= n; i++) {
+                nextLine();
+                candy[i] = new Candy(nextInt(), (int) (nextDouble() * 100 + 0.5));
+            }
+            System.out.println(solve(n, m, candy));
+        }
+    }
+
+    static private int solve(int n, int m, Candy[] candy) {
+        int[] dp = new int[m+1];
+        for (int i = 1; i <= n; i++) { // 사탕 종류
+            int cal = candy[i].c;
+            int val = candy[i].p;
+            for (int j = 0; j <= m; j++) {
+                if (j - val >= 0) dp[j] = Math.max(dp[j], dp[j-val] + cal);
+            }
+        }
+        return dp[m];
+    }
+
+    static class Candy {
+        int c;
+        int p;
+        public Candy(int c, int p) {
+            this.c = c;
+            this.p = p;
+        }
+    }
+}
+```