結果
| 問題 | No.4 おもりと天秤 | 
| コンテスト | |
| ユーザー |  keib | 
| 提出日時 | 2019-03-06 10:33:21 | 
| 言語 | Swift (6.0.3) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 11 ms / 5,000 ms | 
| コード長 | 1,021 bytes | 
| コンパイル時間 | 1,798 ms | 
| コンパイル使用メモリ | 185,588 KB | 
| 実行使用メモリ | 15,616 KB | 
| 最終ジャッジ日時 | 2024-11-30 13:42:06 | 
| 合計ジャッジ時間 | 2,830 ms | 
| ジャッジサーバーID (参考情報) | judge5 / judge1 | 
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| ファイルパターン | 結果 | 
|---|---|
| other | AC * 23 | 
ソースコード
import Foundation
let n = Int(readLine()!)!
let weights = readLine()!.split(separator:" ").map { Int($0)! }
var weightSum = 0
var maxWeight = 0
weights.forEach { weight in
    weightSum += weight
    maxWeight = Swift.max(weight, maxWeight)
}
if weightSum % 2 != 0 {
    print("impossible")
    exit(0)
}
let goal = weightSum / 2
if maxWeight > goal {
    print("impossible")
    exit(0)
}
var possibilities = Array<Int>(repeating: -1, count: goal + 1)
weights.enumerated().forEach { i, weight in 
    if possibilities[weight] < 0  {
        possibilities[weight] = i
    }
    for j in 1 ..< Swift.min(goal - weight + 1, possibilities.count) {
        if possibilities[j] < 0 {
            continue
        }
        if possibilities[j] >= i {
            continue
        }
        if possibilities[j + weight] >= 0  {
            continue
        }
        if j + weight == goal {
            print("possible")
            exit(0)
        }
        possibilities[j + weight] = i
    }
}
print("impossible")
exit(0)
            
            
            
        