[20250211] BOJ / 골드5 / 창영이와 커피 / 신동윤

Author: 03do-new30

03do-new30/202502/11 BOJ G5 창영이와 커피.md

@@ -0,0 +1,65 @@
+```java
+package BOJ;
+
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        int N = Integer.parseInt(st.nextToken());
+        int K = Integer.parseInt(st.nextToken());
+
+        int[] cups = new int[N+1];
+        st = new StringTokenizer(br.readLine());
+        for (int i = 1; i < N+1; i++) {
+            cups[i] = Integer.parseInt(st.nextToken());
+        }
+
+        // dp[i][j] = 카페인 i를 채우기 위해 커피 j까지 고려했을 때 최소 잔 수
+        int[][] dp = new int[K+1][N+1];
+
+        // 초기화
+        int maxCups = 101;
+        for (int i = 0; i < K+1; i++) {
+            for (int j = 0; j < N+1; j++) {
+                if (i == 0) {
+                    dp[i][j] = 0;
+                    continue;
+                }
+                dp[i][j] = maxCups;
+            }
+        }
+
+        for (int caffeine = 1; caffeine < K+1; caffeine++) {
+            for (int coffee = 1; coffee < N+1; coffee++) {
+                // coffee번째 커피를 마시는 경우
+                if (caffeine - cups[coffee] >= 0) {
+                    dp[caffeine][coffee] = Integer.min(dp[caffeine][coffee], dp[caffeine-cups[coffee]][coffee-1] + 1);
+                }
+                // coffee번째 커피를 마시지 않는다면, caffine을 채우기 위해 coffee-1번째 커피까지 고려했을 때의 최소값이 dp[caffeine][coffee]가 됨
+                dp[caffeine][coffee] = Integer.min(dp[caffeine][coffee], dp[caffeine][coffee-1]);
+            }
+        }
+
+        int answer = maxCups;
+        for (int coffee = 1; coffee < N+1; coffee++) {
+            if (dp[K][coffee] < answer) {
+                answer = dp[K][coffee];
+            }
+        }
+        if (answer == maxCups) {
+            answer = -1;
+        }
+        bw.write(answer + "\n");
+
+        br.close();
+        bw.flush();
+        bw.close();
+    }
+}
+
+```