Create BJ_1943_동전분배.java

Author: kn9012

250414/BJ_1943_동전분배.java

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+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.StringTokenizer;
+
+/**
+ * 백준 1943번 동전 분배
+ * - 배낭
+ */
+
+public class Main {
+	public static void main(String[] args) throws IOException {
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		StringTokenizer st;
+		
+		for (int t = 0; t < 3; t++) {
+			int N = Integer.parseInt(br.readLine());
+			
+			int sum = 0;
+			
+			int[][] coins = new int[N][2];
+			
+			for (int i = 0; i < N; i++) {
+				st = new StringTokenizer(br.readLine());
+				int amount = Integer.parseInt(st.nextToken());
+				int count = Integer.parseInt(st.nextToken());
+				
+				coins[i][0] = amount;
+				coins[i][1] = count;
+				
+				sum += amount * count;
+			}
+			
+			if (sum % 2 == 1) {
+				System.out.println(0);
+				continue;
+			}
+			
+			int mid = sum / 2;
+			
+			boolean[] dp = new boolean[mid + 1];
+			boolean[] tmp = new boolean[mid + 1];
+			dp[0] = true;
+			
+			for (int i = 0; i < N; i++) {
+				int amount = coins[i][0];
+				int count = coins[i][1];
+				
+				tmp = dp.clone();
+				
+				for (int j = 1; j <= count; j++) {
+					int cost = amount * j;
+					for (int k = 0; k + cost <= mid; k++) {
+						if (dp[k]) tmp[k + cost] = true;
+					}
+				}
+				
+				dp = tmp;
+			}
+			
+			System.out.println(dp[mid] ? 1 : 0);
+		}
+	}
+}