#1150959 (C#) No.875 Range Mindex Query

• 問題: No.875 Range Mindex Query
• ユーザー: kakel-san
• 提出日時: 2026-03-01 23:48:39
• 言語: C# (.NET 10.0.102)
• 結果: AC
• 実行時間: 229 ms / 2,000 ms
• コード長: 5,510 bytes
• コンパイル時間: 17,734 ms
• コンパイル使用メモリ: 176,132 KB
• 実行使用メモリ: 243,608 KB
• 最終ジャッジ日時: 2026-03-01 23:58:21
• 合計ジャッジ時間: 12,359 ms
• ジャッジサーバーID （参考情報）: judge1 / judge2

ファイルパターン	結果
sample	AC * 1
other	AC * 18

コンパイルメッセージ

  復元対象のプロジェクトを決定しています...
  /home/judge/data/code/main.csproj を復元しました (112 ミリ秒)。
  main -> /home/judge/data/code/bin/Release/net10.0/main.dll
  main -> /home/judge/data/code/bin/Release/net10.0/publish/

ソースコード

using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
using System.Reflection.Metadata;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, q) = (c[0], c[1]);
        var a = NList;
        var map = NArr(q);
        var init = new Info[n];
        for (var i = 0; i < n; ++i) init[i] = new Info(i, a[i]);
        var seg = new SegmentTree<Info>(init, new SegOp());
        var ans = new List<int>();
        for (var i = 0; i < q; ++i)
        {
            var l = map[i][1] - 1;
            var r = map[i][2] - 1;
            if (map[i][0] == 1)
            {
                var tmp = a[l];
                a[l] = a[r];
                seg[l] = new Info(l, a[l]);
                a[r] = tmp;
                seg[r] = new Info(r, a[r]);
            }
            else
            {
                ans.Add(seg.Prod(l, r + 1).Id + 1);
            }
        }
        WriteLine(string.Join("\n", ans));
    }
    struct Info
    {
        public int Id;
        public int Val;
        public Info(int id, int val)
        {
            Id = id; Val = val;
        }
    }
    struct SegOp : ISegmentTreeOperator<Info>
    {
        public Info Identity => new Info(-1, int.MaxValue);

        public Info Operate(Info x, Info y)
        {
            return x.Val < y.Val ? x : y;
        }
    }
    interface ISegmentTreeOperator<T>
    {
        T Identity { get; }
        T Operate(T x, T y);
    }
    class SegmentTree<T>
    {
        int _n;
        int size;
        int log;
        T[] d;
        ISegmentTreeOperator<T> op;
        void Update(int k)
        {
            d[k] = op.Operate(d[2 * k], d[2 * k + 1]);
        }
        public SegmentTree(int n, ISegmentTreeOperator<T> op)
        {
            this.op = op;
            _n = n;
            size = 1;
            while (size < n) size <<= 1;
            log = CountRZero(size);
            d = new T[2 * size];
            for (var i = 0; i < d.Length; ++i) d[i] = op.Identity;
        }
        public SegmentTree(T[] v, ISegmentTreeOperator<T> op)
        {
            this.op = op;
            _n = v.Length;
            size = 1;
            while (size < v.Length) size <<= 1;
            log = CountRZero(size);
            d = new T[2 * size];
            for (var i = 0; i < d.Length; ++i) d[i] = op.Identity;
            for (var i = 0; i < v.Length; ++i) d[size + i] = v[i];
            for (var i = size - 1; i >= 1; --i) Update(i);
        }
        int CountRZero(int n)
        {
            var ans = 0;
            while (n % 2 == 0)
            {
                ++ans;
                n >>= 1;
            }
            return ans;
        }
        public T this[int p]
        {
            get { return d[p + size]; }
            set
            {
                p += size;
                d[p] = value;
                for (var i = 1; i <= log; ++i) Update(p >> i);
            }
        }
        public T Prod(int l, int r)
        {
            var sml = op.Identity;
            var smr = op.Identity;
            l += size;
            r += size;
            while (l < r)
            {
                if ((l & 1) != 0) sml = op.Operate(sml, d[l++]);
                if ((r & 1) != 0) smr = op.Operate(d[--r], smr);
                l >>= 1;
                r >>= 1;
            }
            return op.Operate(sml, smr);
        }
        T AllProd() => d[1];
        int MinLeft(int r, Predicate<T> f)
        {
            if (r == 0) return 0;
            r += size;
            T sm = op.Identity;
            do
            {
                r--;
                while (r > 1 && (r % 2) != 0) r >>= 1;
                if (!f(op.Operate(d[r], sm)))
                {
                    while (r < size)
                    {
                        r = 2 * r + 1;
                        if (f(op.Operate(d[r], sm)))
                        {
                            sm = op.Operate(d[r], sm);
                            r--;
                        }
                    }
                    return r + 1 - size;
                }
                sm = op.Operate(d[r], sm);
            }
            while ((r & -r) != r);
            return 0;
        }
        public int MaxRight(int l, Predicate<T> f)
        {
            if (l == _n) return _n;
            l += size;
            T sm = op.Identity;
            do
            {
                while (l % 2 == 0) l >>= 1;
                if (!f(op.Operate(sm, d[l])))
                {
                    while (l < size)
                    {
                        l = 2 * l;
                        if (f(op.Operate(sm, d[l])))
                        {
                            sm = op.Operate(sm, d[l]);
                            ++l;
                        }
                    }
                    return l - size;
                }
                sm = op.Operate(sm, d[l]);
                ++l;
            } while ((l & -l) != l);
            return _n;
        }
    }
}