結果
| 問題 | No.400 鏡 |
| ユーザー |
 tak
|
| 提出日時 | 2017-08-30 06:01:26 |
| 言語 | C#(csc) (csc 3.9.0) |
| 結果 |
AC
|
| 実行時間 | 29 ms / 2,000 ms |
| コード長 | 23,393 bytes |
| コンパイル時間 | 4,916 ms |
| コンパイル使用メモリ | 128,408 KB |
| 実行使用メモリ | 18,944 KB |
| 最終ジャッジ日時 | 2024-11-06 12:57:31 |
| 合計ジャッジ時間 | 5,818 ms |
|
ジャッジサーバーID （参考情報） |
judge3 / judge4 |
（要ログイン）
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 | AC | 27 ms
18,816 KB |
| testcase_01 | AC | 28 ms
18,560 KB |
| testcase_02 | AC | 28 ms
18,944 KB |
| testcase_03 | AC | 29 ms
18,688 KB |
| testcase_04 | AC | 28 ms
18,816 KB |
| testcase_05 | AC | 28 ms
18,816 KB |
| testcase_06 | AC | 29 ms
18,560 KB |
| testcase_07 | AC | 28 ms
18,560 KB |
| testcase_08 | AC | 28 ms
18,816 KB |
| testcase_09 | AC | 29 ms
18,816 KB |
| testcase_10 | AC | 28 ms
18,688 KB |
| testcase_11 | AC | 27 ms
18,944 KB |
コンパイルメッセージ
Microsoft (R) Visual C# Compiler version 3.9.0-6.21124.20 (db94f4cc) Copyright (C) Microsoft Corporation. All rights reserved.
ソースコード
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
namespace Program {
class MainClass {
//C#Lover///////////////////////////////////////////////////
string S;
////////////////////////////////////////////////////////////
void Solve() {
S = io.String;
S = S.Reversed();
S.Length.REP(i => {
if (S[i] == '<')
io.or(">");
else
io.or("<");
});
io.br();
}
////////////////////////////////////////////////////////////
public static void Main() { new MainClass().Stream(); }
IO io = new IO();
void Stream() { Solve(); io.writeFlush(); }
//void Stream() { Test(); io.writeFlush(); }
void Test() { }
#region MockMacro
//cannot use break,continue,goto
void FOR(int a, int b, Action<int> act) { for (int i = a; i < b; i++) act(i); }
void FORR(int a, int b, Action<int> act) { for (int i = a - 1; i >= b; i--) act(i); }
#endregion
////////////////////////////////////////////////////////////
}
#region default
class IO {
TYPE tp;
string[] nextBuffer; int BufferCnt; char[] cs = new char[]{};
StreamWriter sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
public IO() { nextBuffer = new string[0]; BufferCnt = 0; Console.SetOut(sw); tp = new TYPE(); }
public string Next() {
if (BufferCnt < nextBuffer.Length) return nextBuffer[BufferCnt++];
string st = Console.ReadLine();
while (st == "") st = Console.ReadLine();
nextBuffer = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
BufferCnt = 0;
return nextBuffer[BufferCnt++];
}
public string String => Next();
public char Char => char.Parse(String);
public int Int => int.Parse(String);
public long Long => long.Parse(String);
public double Double => double.Parse(String);
public string[] arr => Console.ReadLine().Split(' ');
public char[] arrChar => Array.ConvertAll(arr, char.Parse);
public int[] arrInt => Array.ConvertAll(arr, int.Parse);
public long[] arrLong => Array.ConvertAll(arr, long.Parse);
public double[] arrDouble => Array.ConvertAll(arr, double.Parse);
public T i<T>() { return tp.suitType<T>(String); }
public void i<T>(out T v) { v = tp.suitType<T>(String); }
public void i<T, U>(out T v1, out U v2) { i(out v1); i(out v2); }
public void i<T, U, V>(out T v1, out U v2, out V v3) { i(out v1); i(out v2); i(out v3); }
public void i<T, U, V, W>(out T v1, out U v2, out V v3, out W v4) {
i(out v1); i(out v2); i(out v3); i(out v4);
}
public void i<T, U, V, W, X>(out T v1, out U v2, out V v3, out W v4, out X v5) {
i(out v1); i(out v2); i(out v3); i(out v4); i(out v5);
}
public void ini<T>(out T[] a, int n) { a = new T[n]; for (int i = 0; i < n; i++) a[i] = tp.suitType<T>(String); }
public void ini<T, U>(out T[] a, out U[] b, int n) {
a = new T[n]; b = new U[n]; for (int i = 0; i < n; i++) { a[i] = i<T>(); b[i] = i<U>(); }
}
public void ini<T, U, V>(out T[] a, out U[] b, out V[] c, int n) {
a = new T[n]; b = new U[n]; c = new V[n];
for (int i = 0; i < n; i++) { a[i] = i<T>(); b[i] = i<U>(); c[i] = i<V>(); }
}
public void ini<T>(out T[,] a, int h, int w) {
a = new T[h, w]; for (int i = 0; i < h; i++) for (int j = 0; j < w; j++) a[i, j] = i<T>();
}
public void o<T>(T v) { Console.WriteLine(v); }
public void o<T>(params T[] a) { Array.ForEach(a, n => o(n)); }
public void o<T>(T[,] a) { a.GetLength(0).REP(i => { a.GetLength(1).REP(j => or(a[i, j] + " ")); br(); }); }
public void ol<T>(T v) { Console.Write(v + " "); }
public void ol<T>(params T[] a) { o(connect<T>(a)); }
public void or<T>(T a) { Console.Write(a); }
public void br() { o(""); }
public void writeFlush() { Console.Out.Flush(); }
private string connect<T>(params T[] s) { return string.Join(" ", s); }
}
class TYPE {
public bool typeEQ<T, U>() { return typeof(T).Equals(typeof(U)); }
public T convertType<T, U>(U v) { return (T)Convert.ChangeType(v, typeof(T)); }
public T suitType<T>(string s) {
if (typeEQ<T, int>()) return convertType<T, int>(int.Parse(s));
if (typeEQ<T, long>()) return convertType<T, long>(long.Parse(s));
if (typeEQ<T, double>()) return convertType<T, double>(double.Parse(s));
if (typeEQ<T, char>()) return convertType<T, char>(char.Parse(s));
return convertType<T, string>(s);
}
}
class PQueue<T> where T : IComparable {
public List<T> heap;
private Comparison<T> comp;
private IComparer<T> comparer;
private int size;
private int type;
public PQueue(int type = 0) : this(Comparer<T>.Default) { this.type = type; }
public PQueue(IComparer<T> comparer) : this(16, comparer.Compare) { this.comparer = comparer; }
public PQueue(Comparison<T> comparison) : this(16, comparison) { }
public PQueue(int capacity, Comparison<T> comparison) { this.heap = new List<T>(capacity); this.comp = comparison; }
public void Enqueue(T item) {
this.heap.Add(item); var i = size++;
while (i > 0) { var p = (i - 1) >> 1; if (Compare(this.heap[p], item) <= 0) break; this.heap[i] = heap[p]; i = p; }
this.heap[i] = item;
}
public T Dequeue() {
var ret = this.heap[0]; var x = this.heap[--size]; var i = 0;
while ((i << 1) + 1 < size) {
var a = (i << 1) + 1; var b = (i << 1) + 2; if (b < size && Compare(heap[b], heap[a]) < 0) a = b;
if (Compare(heap[a], x) >= 0) break; heap[i] = heap[a]; i = a;
}
heap[i] = x; heap.RemoveAt(size);
return ret;
}
public T Peek() { return heap[0]; }
public int Count { get { return size; } }
public bool Any() { return size > 0; }
public bool Empty() { return !Any(); }
public bool Contains(T v) { return heap.Contains(v); }
private int Compare(T x, T y) { return type == 0 ? x.CompareTo(y) : y.CompareTo(x); }
}
#endregion
#region other
class Mat {
public int mod = 1000000007;//10^9+7
public long Pow(long a, long b) {
if (b == 0) return 1;
if (b % 2 == 1) return (a % mod * Pow(a % mod, b - 1) % mod) % mod;
else return Pow(a * a % mod, b / 2) % mod;
}
public long Fact(long n) {
long ret = 1;
for (long i = 1; i <= n; i++)
ret = (ret * i) % mod;
return ret;
}
public long C(long n, long r) {
if (r == 0 || n == r) return 1;
if (n == 0) return 0;
if (n < 0 || n < r) throw new ArgumentException("n,r invalid");
else return (Fact(n) % mod * Pow((Fact(n - r) % mod * Fact(r) % mod) % mod, mod - 2) % mod) % mod;
}
public long DupC(long n, long r) { return C(n + r - 1, r); }
public long P(long n, long r) { return Fact(n) / (Fact(n - r)); }//test
public bool isPrime(long n) {
if (n == 2) return true; if (n < 2 || n % 2 == 0) return false;
for (long v = 3; v <= (long)Math.Sqrt(n); v += 2) if (n % v == 0) return false;
return true;
}
public long LCM(long a, long b) { return a * (b / GCD(a, b)); }
public long LCM(params long[] a) { return a.Aggregate((v, n) => LCM(v, n)); }
public long GCD(long a, long b) { if (a < b) Swap(ref a, ref b); return b == 0 ? a : GCD(b, a % b); }
public long GCD(params long[] array) { return array.Aggregate((v, n) => GCD(v, n)); }
public T Max<T>(params T[] a) { return a.Max(); }
public T Min<T>(params T[] a) { return a.Min(); }
public void Swap<T>(ref T a, ref T b) { T tmp = a; a = b; b = tmp; }
public double Dis(int x1, int y1, int x2, int y2) { return Math.Sqrt(Math.Pow((x2 - x1), 2) + Math.Pow((y2 - y1), 2)); }
public int mDis(int x1, int y1, int x2, int y2) { return Math.Abs(x1 - x2) + Math.Abs(y1 - y2); }
public int Dig2Num(IEnumerable<int> enu) {//test
int ret = 0;
foreach (var v in enu) {
ret *= 10;
ret += v;
}
return ret;
}
public int Digit(long n) { return (n == 0) ? 1 : (int)Math.Log10(n) + 1; }
public int DigVal(int n, int dig) { return (n % (int)Pow(10, dig)) / (int)Pow(10, dig - 1); }
public int[] DigValArr(int n) { int[] ret = new int[Digit(n)]; ret.Length.REP(i => ret[i] = DigVal(n, i + 1)); return ret; }
public long Tousa(long a, long d, int n) { return a + (n - 1) * d; }
public long TousaSum(long a, long d, int n) { return n * (2 * a + (n - 1) * d) / 2; }
public IEnumerable<int[]> eunP(int[] Arr, int Use = -1) {//列挙順列
Use = (Use != -1) ? Use : Arr.Length; if (Use == 0 || Arr.Length < Use) yield break;
var s = new Stack<List<int>>();
Arr.Length.REPR(i => s.Push(new List<int>() { i }));
while (s.Count > 0) {
var cur = s.Pop();
if (cur.Count == Use) {
var ret = new List<int>(); cur.ForEach(X => ret.Add(Arr[X]));
yield return ret.ToArray();
} else
Arr.Length.REPR(i => { if (!cur.Contains(i)) s.Push(new List<int>(cur) { i }); });
}
}
public IEnumerable<int[]> enuC(int[] Arr, int Use = -1) {//列挙組み合わせ
Use = (Use != -1) ? Use : Arr.Length; if (Use == 0 || Arr.Length < Use) yield break;
var s = new Stack<Tuple<int, List<int>>>();
Arr.Length.REPR(i => s.Push(Tuple.Create(i, new List<int>() { Arr[i] })));
while (s.Count > 0) {
var cur = s.Pop();
if (cur.Item2.Count == Use)
yield return cur.Item2.ToArray();
else
for (int i = Arr.GetUpperBound(0); i > cur.Item1; i--)
s.Push(Tuple.Create(i, new List<int>(cur.Item2) { Arr[i] }));
}
}
public IEnumerable<int[]> eunDupP(int[] Arr, int Use = -1) {//列挙重複順列
Use = (Use != -1) ? Use : Arr.Length; if (Use == 0) yield break; var s = new Stack<List<int>>();
Arr.Length.REPR(i => s.Push(new List<int>() { Arr[i] }));
while (s.Count > 0) {
var cur = s.Pop();
if (cur.Count == Use)
yield return cur.ToArray();
else
Arr.Length.REPR(i => s.Push(new List<int>(cur) { Arr[i] }));
}
}
public IEnumerable<int[]> enuDupC(int[] Arr, int Use = -1) {//列挙組み合わせ
Use = (Use != -1) ? Use : Arr.Length; if (Use == 0) yield break;
var s = new Stack<Tuple<int, List<int>>>();
Arr.Length.REPR(i => s.Push(Tuple.Create(i, new List<int>() { Arr[i] })));
while (s.Count > 0) {
var cur = s.Pop();
if (cur.Item2.Count == Use)
yield return cur.Item2.ToArray();
else
for (int i = Arr.GetUpperBound(0); i >= cur.Item1; i--)
s.Push(Tuple.Create(i, new List<int>(cur.Item2) { Arr[i] }));
}
}
public IEnumerable<long[]> enuPart(string str) {
var s = new Stack<Tuple<string, List<long>, int>>();
s.Push(Tuple.Create(str[0].ToString(), new List<long>(), 1));
while (s.Count > 0) {
var cur = s.Pop();
if (cur.Item3 >= str.Length) {
yield return (new List<long>(cur.Item2) { cur.Item1.toLong() }).ToArray();
} else {
//繋げる
s.Push(Tuple.Create(cur.Item1 + str[cur.Item3], new List<long>(cur.Item2), cur.Item3 + 1));
//繋がない
s.Push(Tuple.Create(str[cur.Item3].ToString(), new List<long>(cur.Item2) { cur.Item1.toLong() }, cur.Item3 + 1));
}
}
}
}
class AssociativeArray<T> : IEnumerable {//hack:KeyValuePairの利用に制限がかかる
public Dictionary<T, int> dic;
public AssociativeArray() { dic = new Dictionary<T, int>(); }
public AssociativeArray(params T[] a) { dic = new Dictionary<T, int>(); Add(a); }
public void Add(params T[] a) { a.Length.REP(i => { if (!conK(a[i])) dic[a[i]] = 0; dic[a[i]]++; }); }
public void Set(T k, int v) { if (!dic.ContainsKey(k)) dic[k] = 0; dic[k] = v; }
public void Remove(params T[] a) { a.Length.REP(i => { if (conK(a[i])) dic.Remove(a[i]); }); }
public T[] Keys() { return dic.Keys.ToArray<T>(); }
public int Val(T k) { return (dic.ContainsKey(k)) ? dic[k] : 0; }
public int ValSum => dic.Values.Sum();
public int KeyNum => dic.Keys.Count;
public int MaxVal => dic.Values.Max();
public int MinVal => dic.Values.Min();
public T MaxKey => dic.First(d => d.Value == MaxVal).Key;
public T MinKey => dic.First(d => d.Value == MinVal).Key;
public bool conK(T k) { return dic.ContainsKey(k); }
public bool anyK(params T[] k) { return k.Any(key => conK(key)); }
public bool allK(params T[] k) { return k.All(key => conK(key)); }
public void Show() { foreach (var v in dic) { Console.WriteLine(v.Key + " : " + v.Value); } }
public IEnumerator GetEnumerator() { foreach (var kp in dic) yield return kp; }
//:sort->array
}
class UnionFind {
public int[] parent; public int[] depth;
public void Init(int n) { parent = new int[n]; depth = new int[n]; n.REP(i => parent[i] = i); }
public int Find(int x) { return (parent[x] == x) ? x : parent[x] = Find(parent[x]); }
public void Unite(int x, int y) {
x = Find(x); y = Find(y); if (x == y) return;
if (depth[x] < depth[y]) parent[x] = y; else { parent[y] = x; if (depth[x] == depth[y]) depth[x]++; }
}
public bool Same(int a, int b) { return Find(a) == Find(b); }
}
class Time { public bool isLeapYear(int y) { return (y % 400 == 0 || (y % 4 == 0 && y % 100 != 0)); } }
#endregion
#region Graph
class Index {
public int[] Comp(int[] bef) {
int[] aft = new int[bef.Length];
var tmp = bef.Distinct().OrderBy(v => v).Select((v, i) => new { v, i }).ToDictionary(p => p.v, p => p.i);
aft = bef.Select(v => tmp[v]).ToArray();
return aft;
}
}
class BasicGraph {//けす
public List<Tuple<int, long>>[] G;
public void Init(int n) { G = new List<Tuple<int, long>>[n + 1]; G.Length.REP(i => G[i] = new List<Tuple<int, long>>()); }
public void Dir(int[] f, int[] t) { f.Length.REP(i => G[f[i]].Add(Tuple.Create(t[i], 1L))); }
public void Dir(int[] f, int[] t, long[] c) { f.Length.REP(i => G[f[i]].Add(Tuple.Create(t[i], c[i]))); }
public void NonDir(int[] f, int[] t) { f.Length.REP(i => { G[f[i]].Add(Tuple.Create(t[i], 1L)); G[t[i]].Add(Tuple.Create(f[i], 1L)); }); }
public void NonDir(int[] f, int[] t, long[] c) { f.Length.REP(i => { G[f[i]].Add(Tuple.Create(t[i], c[i])); G[t[i]].Add(Tuple.Create(f[i], c[i])); }); }
}
class TreeDis {//test
public List<Tuple<long, long>>[] g; public long[] a2other; private int type;
public TreeDis(int type = 0) { this.type = type; }//0->bfs,other->dfs
public void Init(long n) { g = new List<Tuple<long, long>>[n + 1]; g.Length.REP(i => g[i] = new List<Tuple<long, long>>()); }
public void Run(long[] a, long[] b) { a.Length.REP(i => { g[a[i]].Add(Tuple.Create(b[i], 1L)); g[b[i]].Add(Tuple.Create(a[i], 1L)); }); }
public void Run(long[] a, long[] b, long[] w) { a.Length.REP(i => { g[a[i]].Add(Tuple.Create(b[i], w[i])); g[b[i]].Add(Tuple.Create(a[i], w[i])); }); }
public long[] a2iArr(long a) { a2other = new long[g.Count()]; if (type == 0) BFS(a); else DFS(a); return a2other; }
private void BFS(long a) {
var q = new Queue<Tuple<long, long>>(); q.Enqueue(Tuple.Create(a, -1L));
while (q.Count > 0) {
var c = q.Dequeue();
foreach (var v in g[c.Item1]) {
if (v.Item1 == c.Item2) continue;
a2other[v.Item1] = a2other[c.Item1] + v.Item2; q.Enqueue(Tuple.Create(v.Item1, c.Item1));
}
}
}
private void DFS(long a) {
var s = new Stack<Tuple<long, long>>(); s.Push(Tuple.Create(a, -1L));
while (s.Count > 0) {
var c = s.Pop();
foreach (var v in g[c.Item1]) {
if (v.Item1 == c.Item2) continue;
a2other[v.Item1] = a2other[c.Item1] + v.Item2; s.Push(Tuple.Create(v.Item1, c.Item1));
}
}
}
}
class ShortestPath {
public long INF = (long)1e15; protected int I = -1; public long[] cost;
protected List<Tuple<int, long>>[] Adj; protected bool isNonDir = true;
public void Init(int n) { I = n + 1; Adj = new List<Tuple<int, long>>[I]; I.REP(i => Adj[i] = new List<Tuple<int, long>>()); }
public void AddPath(int f, int t, long c) {
if (isNonDir) {
Adj[f].Add(Tuple.Create(t, c)); Adj[t].Add(Tuple.Create(f, c));
} else {
Adj[f].Add(Tuple.Create(t, c));
}
}
public void AddPath(int[] f, int[] t, long[] c) { f.Length.REP(i => AddPath(f[i], t[i], c[i])); }
}
class Dijkstra : ShortestPath {//隣接対応後検証不足,有向
public long MinCost(int f, int t) {
cost = new long[I]; cost.Set(INF); cost[f] = 0;
var pq = new PQueue<Tuple<int, long>>(); pq.Enqueue(Tuple.Create(f, 0L));//(from,cost)
while (pq.Count > 0) {
var cur = pq.Dequeue();
if (cost[cur.Item1] < cur.Item2) continue; Adj[cur.Item1].Count.REP(i => {
var tmp = Adj[cur.Item1][i];
if (cost[tmp.Item1] > cost[cur.Item1] + tmp.Item2) {
cost[tmp.Item1] = cost[cur.Item1] + tmp.Item2; pq.Enqueue(Tuple.Create(tmp.Item1, cost[tmp.Item1]));
}
});
}
return cost[t];
}
}
class BellmanFord : ShortestPath {
private bool[] neg;
public BellmanFord() { }
public BellmanFord(bool isNonDir) { this.isNonDir = isNonDir; }
public long MinCost(int f, int t) {
cost = new long[I]; cost.Set(INF); cost[f] = 0; neg = new bool[I];
for (int i = 0; i < I - 1; i++) {
I.REP(j => Adj[j].Count.REP(k => {
var cur = Adj[j][k];
if (cost[cur.Item1] > cost[j] + cur.Item2)
cost[cur.Item1] = cost[j] + cur.Item2;
}));
}
for (int i = 0; i < I; i++) {
I.REP(j => Adj[j].Count.REP(k => {
var cur = Adj[j][k];
if (cost[cur.Item1] > cost[j] + cur.Item2) {
cost[cur.Item1] = cost[j] + cur.Item2;
neg[cur.Item1] = true;
}
if (neg[j]) neg[cur.Item1] = true;
}));
}
return cost[t];
}
public bool loopExist() { return neg[I - 1]; }
}
class WarshallFloyd {//そのうちAdjとどっちがいいか...TODO:ジェネリック
private int E; private int INF = (int)1e9; public long[,] G;
public void Init(int n) { E = n + 1; G = new long[E, E]; G.Set(INF); E.REP(i => G[i, i] = 0); }
public void AddPath(int f, int t, long c) { G[f, t] = c; G[t, f] = c; }
public void AddPath(int[] f, int[] t) { f.Length.REP(i => AddPath(f[i], t[i], 1)); }
public void AddPath(int[] f, int[] t, long[] c) { f.Length.REP(i => AddPath(f[i], t[i], c[i])); }
public void Run() { G = MinCostArr(); }
public long[,] MinCostArr() { E.REP(i => E.REP(j => E.REP(k => G[j, k] = Math.Min(G[j, k], G[j, i] + G[i, k])))); return G; }
}
#endregion
#region Ex
static class StringEX {//文字
public static string Reversed(this string s) { return string.Join("", s.Reverse()); }
public static string Repeat(this string s, int n) { return string.Concat(Enumerable.Repeat(s, n).ToArray()); }
public static int toInt(this string s) { int n; return (int.TryParse(s.TrimStart('0'), out n)) ? n : 0; }
public static int toInt(this char c) { return toInt(c.ToString()); }
public static int toInt(this char[] c) { return toInt(new string(c)); }
public static long toLong(this string s) { long n; return (long.TryParse(s.TrimStart('0'), out n)) ? n : (long)0; }
public static long toLong(this char c) { return toLong(c.ToString()); }
public static long toLong(this char[] c) { return toLong(new string(c)); }
public static string toString(this char[] c) { return new string(c); }
}
static class NumericEx {//数値
public static string pad0<T>(this T v, int n) { return v.ToString().PadLeft(n, '0'); }
public static double RoundOff(this double v, int n) { return Math.Round(v, n - 1, MidpointRounding.AwayFromZero); }
public static bool Odd(this int v) { return v % 2 != 0; }
public static bool Odd(this long v) { return v % 2 != 0; }
public static void REP(this int v, Action<int> act) { for (int i = 0; i < v; ++i) act(i); }
public static void REPR(this int v, Action<int> act) { for (int i = v - 1; i >= 0; --i) act(i); }
}
static class ArrayEX {
public static T[] Sort<T>(this T[] a) { Array.Sort(a); return a; }
public static T[] SortR<T>(this T[] a) { Array.Sort(a); Array.Reverse(a); return a; }
public static void Set<T>(this T[] a, T v) { a.Length.REP(i => a[i] = v); }
public static void Set<T>(this T[,] a, T v) { a.GetLength(0).REP(i => a.GetLength(1).REP(j => a[i, j] = v)); }
}
static class BitEx {
public static bool Any(this BitArray b) { foreach (bool f in b) if (f) return true; return false; }
public static bool All(this BitArray b) { foreach (bool f in b) if (!f) return false; return true; }
public static bool None(this BitArray b) { return !Any(b); }
public static void Flip(this BitArray b, int index) { b.Set(index, !b.Get(index)); }
}
static class TestEx {
//operator
}
#endregion
}