using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using YukicoderContest264.Extensions; using YukicoderContest264.Questions; namespace YukicoderContest264.Questions { /// /// https://yukicoder.me/problems/no/1219 /// public class QuestionC : AtCoderQuestionBase { public override IEnumerable Solve(TextReader inputStream) { _ = inputStream.ReadIntArray(); var stones = inputStream.ReadLongArray(); var removed = new long[stones.Length]; for (int i = 0; i < stones.Length; i++) { var needed = i + 1; if (stones[i] > needed) { yield return "No"; yield break; } else if (stones[i] == needed) { removed[i]++; stones[i] = 0; } } long prefix = 0; for (int i = stones.Length - 1; i >= 0; i--) { var needed = i + 1; stones[i] += prefix; removed[i] += stones[i] / needed; stones[i] %= needed; prefix += removed[i]; } yield return stones.All(si => si == 0) ? "Yes" : "No"; } } } namespace YukicoderContest264 { class Program { static void Main(string[] args) { IAtCoderQuestion question = new QuestionC(); var answers = question.Solve(Console.In); var writer = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false }; Console.SetOut(writer); foreach (var answer in answers) { Console.WriteLine(answer); } Console.Out.Flush(); } } } #region Base Class namespace YukicoderContest264.Questions { public interface IAtCoderQuestion { IEnumerable Solve(string input); IEnumerable Solve(TextReader inputStream); } public abstract class AtCoderQuestionBase : IAtCoderQuestion { public IEnumerable Solve(string input) { var stream = new MemoryStream(Encoding.Unicode.GetBytes(input)); var reader = new StreamReader(stream, Encoding.Unicode); return Solve(reader); } public abstract IEnumerable Solve(TextReader inputStream); } } #endregion #region Extensions namespace YukicoderContest264.Extensions { public static class StringExtensions { public static string Join(this IEnumerable source) => string.Concat(source); public static string Join(this IEnumerable source, char separator) => string.Join(separator, source); public static string Join(this IEnumerable source, string separator) => string.Join(separator, source); } public static class TextReaderExtensions { public static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader)); public static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader)); public static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader)); public static string ReadString(this TextReader reader) => reader.ReadLine(); public static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray(); public static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray(); public static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray(); public static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator); // Supports primitive type only. public static T1 ReadValue(this TextReader reader) => (T1)Convert.ChangeType(reader.ReadLine(), typeof(T1)); public static (T1, T2) ReadValue(this TextReader reader, char separator = ' ') { var inputs = ReadStringArray(reader, separator); var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1)); var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2)); return (v1, v2); } public static (T1, T2, T3) ReadValue(this TextReader reader, char separator = ' ') { var inputs = ReadStringArray(reader, separator); var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1)); var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2)); var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3)); return (v1, v2, v3); } public static (T1, T2, T3, T4) ReadValue(this TextReader reader, char separator = ' ') { var inputs = ReadStringArray(reader, separator); var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1)); var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2)); var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3)); var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4)); return (v1, v2, v3, v4); } public static (T1, T2, T3, T4, T5) ReadValue(this TextReader reader, char separator = ' ') { var inputs = ReadStringArray(reader, separator); var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1)); var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2)); var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3)); var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4)); var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5)); return (v1, v2, v3, v4, v5); } public static (T1, T2, T3, T4, T5, T6) ReadValue(this TextReader reader, char separator = ' ') { var inputs = ReadStringArray(reader, separator); var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1)); var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2)); var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3)); var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4)); var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5)); var v6 = (T6)Convert.ChangeType(inputs[5], typeof(T6)); return (v1, v2, v3, v4, v5, v6); } public static (T1, T2, T3, T4, T5, T6, T7) ReadValue(this TextReader reader, char separator = ' ') { var inputs = ReadStringArray(reader, separator); var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1)); var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2)); var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3)); var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4)); var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5)); var v6 = (T6)Convert.ChangeType(inputs[5], typeof(T6)); var v7 = (T7)Convert.ChangeType(inputs[6], typeof(T7)); return (v1, v2, v3, v4, v5, v6, v7); } public static (T1, T2, T3, T4, T5, T6, T7, T8) ReadValue(this TextReader reader, char separator = ' ') { var inputs = ReadStringArray(reader, separator); var v1 = (T1)Convert.ChangeType(inputs[0], typeof(T1)); var v2 = (T2)Convert.ChangeType(inputs[1], typeof(T2)); var v3 = (T3)Convert.ChangeType(inputs[2], typeof(T3)); var v4 = (T4)Convert.ChangeType(inputs[3], typeof(T4)); var v5 = (T5)Convert.ChangeType(inputs[4], typeof(T5)); var v6 = (T6)Convert.ChangeType(inputs[5], typeof(T6)); var v7 = (T7)Convert.ChangeType(inputs[6], typeof(T7)); var v8 = (T8)Convert.ChangeType(inputs[7], typeof(T8)); return (v1, v2, v3, v4, v5, v6, v7, v8); } } } #endregion