Submission #2859019

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Source Code Expand

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;

namespace AtCoder
{
    class Program
    {
        private static string Read() { return Console.ReadLine(); }
        private static int ReadInt() { return int.Parse(Read()); }
        private static long ReadLong() { return long.Parse(Read()); }
        private static double ReadDouble() { return double.Parse(Read()); }
        private static int[] ReadInts() { return Array.ConvertAll(Read().Split(), int.Parse); }
        private static long[] ReadLongs() { return Array.ConvertAll(Read().Split(), long.Parse); }
        private static double[] ReadDoubles() { return Array.ConvertAll(Read().Split(), double.Parse); }

        static long Solve(int N, int[] A)
        {
            var tuples = new Tuple<int, int>[N];
            for (int i = 0; i < N; ++i)
            {
                tuples[i] = new Tuple<int, int>(A[i], i);
            }
            Array.Sort(tuples);

            long sum = 0;
            var list = new SortedList<int, int>();
            list[-1] = 0;
            list[N] = 0;
            for (int i = 0; i < N; ++i)
            {
                int n = tuples[i].Item2;
                list[n] = 0;
                int j = list.IndexOfKey(n);
                int L = list.ElementAt(j - 1).Key;
                int R = list.ElementAt(j + 1).Key;
                sum += Math.BigMul(n - L, R - n) * tuples[i].Item1;
            }
            return sum;
        }

        static void Main(string[] args)
        {
            int N = ReadInt();
            int[] A = ReadInts();
            Console.WriteLine(Solve(N, A));
        }
    }
}

Submission Info

Judge Result