結果

問題 No.576 E869120 and Rings
ユーザー 明智重蔵明智重蔵
提出日時 2022-12-31 13:07:40
言語 C#(csc)
(csc 3.9.0)
結果
TLE  
実行時間 -
コード長 7,312 bytes
コンパイル時間 1,004 ms
コンパイル使用メモリ 68,780 KB
実行使用メモリ 41,124 KB
最終ジャッジ日時 2023-08-17 14:13:50
合計ジャッジ時間 41,776 ms
ジャッジサーバーID
（参考情報） 		judge14 / judge15
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 TLE -
testcase_01 TLE -
testcase_02 TLE -
testcase_03 TLE -
testcase_04 TLE -
testcase_05 TLE -
testcase_06 TLE -
testcase_07 TLE -
testcase_08 WA -
testcase_09 TLE -
testcase_10 TLE -
testcase_11 TLE -
testcase_12 TLE -
testcase_13 WA -
testcase_14 TLE -
testcase_15 AC 74 ms
25,312 KB
testcase_16 WA -
testcase_17 TLE -
testcase_18 TLE -
testcase_19 TLE -
testcase_20 TLE -
testcase_21 TLE -
testcase_22 AC 67 ms
25,776 KB
testcase_23 AC 66 ms
23,760 KB
testcase_24 AC 67 ms
25,808 KB
testcase_25 AC 61 ms
21,756 KB
testcase_26 AC 68 ms
25,696 KB
testcase_27 AC 67 ms
25,788 KB
testcase_28 AC 67 ms
25,704 KB
testcase_29 AC 66 ms
23,768 KB
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ソースコード

diff # 

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("8 4");
            WillReturn.Add("11101110");
            //0.857142857142857
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("8 4");
            WillReturn.Add("11011001");
            //0.833333333333333
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("10 4");
            WillReturn.Add("1001001001");
            //0.6
        }
        else if (InputPattern == "Input4") {
            return System.IO.File.ReadAllLines(@"D:\CSharp\TestConsole\test_in\in01.txt").ToList();
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static int mN;
    static int mK;

    static float[] mAArr;
    static float[] mCompareArr;
    static int UB2;

    static void Main()
    {
        List<string> InputList = GetInputList();
        int[] wkArr = InputList[0].Split(' ').Select(pX => int.Parse(pX)).ToArray();
        mN = wkArr[0];
        mK = wkArr[1];

        mAArr = new float[mN];
        bool HasZero = false;
        for (int I = 0; I <= InputList[1].Length - 1; I++) {
            if (InputList[1][I] == '0') {
                mAArr[I] = 0F;
                HasZero = true;
            }
            if (InputList[1][I] == '1') mAArr[I] = 1F;
        }
        mCompareArr = new float[mN * 2];
        UB2 = mCompareArr.GetUpperBound(0);

        // 全て1の場合
        if (HasZero == false) {
            Console.WriteLine(1);
            return;
        }

        // 答えで二分探索
        float L = 0F;
        float R = 1F;

        while (L + 0.000001 < R) {
            float Mid = (L + R) / 2;

            bool Result = CanAchieve(Mid);
            if (Result) {
                L = Mid;
            }
            else {
                R = Mid;
            }
        }
        Console.WriteLine(R);
    }

    // NeedAVGを達成できるかを判定
    static bool CanAchieve(float pNeedAVG)
    {
        // 取得区間はK以上N以下なので、2倍の長さにしておく
        for (int I = 0; I <= mAArr.GetUpperBound(0); I++) {
            mCompareArr[I + mN] = mCompareArr[I] = mAArr[I] - pNeedAVG;
        }

        // 累積和を設定する
        for (int I = 1; I <= UB2; I++) {
            mCompareArr[I] += mCompareArr[I - 1];
        }

        var InsDeque = new Deque<int>(mN);

        // 終端を全探索
        bool FirstFlag = true;
        int PrevRangeEnd = -1;

        for (int I = mN - 1; I <= UB2; I++) {
            // 始点候補のSta
            int RangeSta = I - mN + 1;

            // 始点候補のEnd
            int RangeEnd = I - mK + 1;

            if (FirstFlag) {
                FirstFlag = false;
            }
            else {
                RangeSta = Math.Max(RangeSta, PrevRangeEnd + 1);
            }

            // 引退処理
            while (InsDeque.Count > 0) {
                int FrontInd = InsDeque[0];
                if (RangeSta <= FrontInd && FrontInd <= RangeEnd == false) {
                    InsDeque.PopFront();
                    continue;
                }
                break;
            }

            for (int J = RangeSta; J <= RangeEnd; J++) {
                // 押し出し処理
                while (InsDeque.Count > 0) {
                    int LastInd = InsDeque[InsDeque.Count - 1];

                    float RunSum1 = 0F;
                    if (LastInd >= 1) {
                        RunSum1 = mCompareArr[LastInd - 1];
                    }

                    float RunSum2 = 0F;
                    if (J >= 1) {
                        RunSum2 = mCompareArr[J - 1];
                    }

                    if (RunSum1 >= RunSum2) {
                        InsDeque.PopBack();
                        continue;
                    }
                    break;
                }
                // 追加処理
                InsDeque.PushBack(J);
            }
            PrevRangeEnd = RangeEnd;

            // 最小値
            int MinInd = InsDeque[0];
            float MinVal = 0F;
            if (MinInd >= 1) {
                MinVal = mCompareArr[MinInd - 1];
            }

            if (mCompareArr[I] - MinVal >= 0) return true;
        }
        return false;
    }
}

#region Deque
internal class Deque<T>
{
    T[] buf;
    int offset, count, capacity;

    internal int Count { get { return count; } }

    internal Deque(int cap) { buf = new T[capacity = cap]; }

    internal Deque() { buf = new T[capacity = 16]; }

    internal T this[int index]
    {
        get { return buf[GetIndex(index)]; }
        set { buf[GetIndex(index)] = value; }
    }

    private int GetIndex(int index)
    {
        if (index >= capacity)
            throw new IndexOutOfRangeException("out of range");
        int ret = index + offset;
        if (ret >= capacity)
            ret -= capacity;
        return ret;
    }

    internal void PushFront(T item)
    {
        if (count == capacity) Extend();
        if (--offset < 0) offset += buf.Length;
        buf[offset] = item;
        count++;
    }

    internal T PopFront()
    {
        if (count == 0)
            throw new InvalidOperationException("collection is empty");
        count--;
        T ret = buf[offset++];
        if (offset >= capacity) offset -= capacity;
        return ret;
    }

    internal void PushBack(T item)
    {
        if (count == capacity) Extend();
        int id = count + offset;
        count++;
        if (id >= capacity) id -= capacity;
        buf[id] = item;
    }

    internal T PopBack()
    {
        if (count == 0)
            throw new InvalidOperationException("collection is empty");
        return buf[GetIndex(--count)];
    }

    internal void Insert(int index, T item)
    {
        if (index > count) throw new IndexOutOfRangeException();
        this.PushFront(item);
        for (int i = 0; i < index; i++)
            this[i] = this[i + 1];
        this[index] = item;
    }

    internal T RemoveAt(int index)
    {
        if (index < 0 || index >= count) throw new IndexOutOfRangeException();
        T ret = this[index];
        for (int i = index; i > 0; i--)
            this[i] = this[i - 1];
        this.PopFront();
        return ret;
    }

    private void Extend()
    {
        T[] newBuffer = new T[capacity << 1];
        if (offset > capacity - count) {
            int len = buf.Length - offset;
            Array.Copy(buf, offset, newBuffer, 0, len);
            Array.Copy(buf, 0, newBuffer, len, count - len);
        }
        else Array.Copy(buf, offset, newBuffer, 0, count);
        buf = newBuffer;
        offset = 0;
        capacity <<= 1;
    }

    internal T[] Items//デバッグ時に中身を調べるためのプロパティ
    {
        get
        {
            T[] a = new T[count];
            for (int i = 0; i < count; i++)
                a[i] = this[i];
            return a;
        }
    }
}
#endregion
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