[nathan] 동전분배 0303 java 풀이 실패

nathan/java/src/main/java/org/example/mar/동전분배0303.java

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+package org.example.mar;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.StringTokenizer;
+
+public class 동전분배0303 {
+
+	static List<Integer> coins = new ArrayList<>();
+	static int answer;
+
+	// 동전 c개를 선택하여 총 금액의 절반 금액을 만들어 낼 수 있다면 true 아니면 false
+	public static void main(String[] args) throws IOException {
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		StringTokenizer st;
+		StringBuilder sb = new StringBuilder();
+		for (int i = 0; i < 3; i++) {
+			answer = 0;
+			int n = Integer.parseInt(br.readLine());
+			int totalPrice = 0;
+			int price, nums;
+			for (int j = 0; j < n; j++) {
+				st = new StringTokenizer(br.readLine());
+				price = Integer.parseInt(st.nextToken());
+				nums = Integer.parseInt(st.nextToken());
+				for (int k = 0; k < nums; k++) {
+					coins.add(price);
+				}
+				totalPrice += price * nums;
+			}
+			totalPrice /= 2;
+			boolean[] visited = new boolean[coins.size()];
+			backtracking(0, visited, totalPrice, 0);
+			sb.append(answer).append("\n");
+		}
+		System.out.println(sb);
+	}
+
+	static void backtracking(int sum, boolean[] visited, int totalPrice, int start) {
+		if (sum >= totalPrice) {
+			if (sum == totalPrice) {
+				answer = 1;
+			}
+			return;
+		}
+
+		for (int i = start; i < coins.size(); i++) {
+			if (!visited[i]) {
+				visited[i] = true;
+				sum += coins.get(i);
+				backtracking(sum, visited, totalPrice, i+1);
+				sum -= coins.get(i);
+				visited[i] = false;
+			}
+		}
+	}
+
+}

nathan/java/src/main/java/org/example/mar/동전분배0303_2.java

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+package org.example.mar;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.StringTokenizer;
+
+public class 동전분배0303_2 {
+	static List<Integer> coins = new ArrayList<>();
+	static int answer;
+
+	public static void main(String[] args) throws IOException {
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		StringTokenizer st;
+		StringBuilder sb = new StringBuilder();
+		for (int i = 0; i < 3; i++) {
+			answer = 0;
+			int n = Integer.parseInt(br.readLine());
+			int totalPrice = 0;
+			int price, nums;
+			for (int j = 0; j < n; j++) {
+				st = new StringTokenizer(br.readLine());
+				price = Integer.parseInt(st.nextToken());
+				nums = Integer.parseInt(st.nextToken());
+				for (int k = 0; k < nums; k++) {
+					coins.add(price);
+				}
+				totalPrice += price * nums;
+			}
+			totalPrice /= 2;
+			boolean[] visited = new boolean[coins.size()];
+
+			sb.append(answer).append("\n");
+		}
+		System.out.println(sb);
+	}
+
+	static void dp() {
+
+	}
+
+}