結果
問題 |
No.4 おもりと天秤
|
ユーザー |
|
提出日時 | 2020-07-07 22:40:48 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 200 ms / 5,000 ms |
コード長 | 1,696 bytes |
コンパイル時間 | 2,331 ms |
コンパイル使用メモリ | 79,452 KB |
実行使用メモリ | 52,960 KB |
最終ジャッジ日時 | 2024-10-01 21:44:52 |
合計ジャッジ時間 | 6,731 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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ファイルパターン | 結果 |
---|---|
other | AC * 23 |
ソースコード
import java.util.ArrayList; import java.util.Collections; import java.util.HashSet; import java.util.List; import java.util.Scanner; import java.util.Set; public class Main { public static void main(String[] args) { new Main().execute(); } private void execute() { int[] weights = loadInputValue(); outputResult(canDevideInHalf(weights)); } boolean canDevideInHalf(int[] weights) { int totalWeight = total(weights); if (totalWeight % 2 != 0) { return false; } int goalWeight = totalWeight / 2; return canMakeWeight(weights, goalWeight); } private boolean canMakeWeight(int[] weights, int goalWeight) { Set<Integer> makableWeights = new HashSet<>(); makableWeights.add(0); for (Integer weight : weights) { Set<Integer> additionalWeights = new HashSet<>(makableWeights); for (Integer makableWeight : makableWeights) { int additionalWeight = makableWeight + weight; if (additionalWeight == goalWeight) { return true; } else if (additionalWeight > goalWeight) { continue; } additionalWeights.add(additionalWeight); } makableWeights = additionalWeights; } return false; } private int total(int[] values) { int totalValue = 0; for (int value : values) { totalValue += value; } return totalValue; } @SuppressWarnings("resource") private int[] loadInputValue() { Scanner sc = new Scanner(System.in); int[] ret = new int[sc.nextInt()]; for (int i = 0; i < ret.length; i++) { ret[i] = sc.nextInt(); } return ret; } private void outputResult(boolean canDevideInHalf) { if (canDevideInHalf) { System.out.println("possible"); } else { System.out.println("impossible"); } } }