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arrays - 查找两个数组中的公共(public)元素

转载 作者:行者123 更新时间:2023-12-03 18:13:57 26 4
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我已经声明了一个类似于下面的类型。

type
TLikes = record
Name : string[20];
favColours : array of string[20];

faves = array of TLikes;

填充记录后,我将它们保存到二进制文件中,因此结构如下所示。

[John],     [Green]     [White]     [Blue]
[Paul], [Blue] [Red] [White] [Green]
[David], [Red] [Blue] [Green]
[Bob], [White] [Blue]
[Peter], [Blue] [Green] [Red]

例如,很容易找出大卫喜欢什么颜色。当我想知道谁喜欢蓝色时出现了一个小问题。所以我所做的是构建第二个文件,就像这样……

[Blue],     [John]      [Paul]      [David]     [Peter]         [Bob]
[Red], [David] [Paul] [Peter]
[White], [Bob] [David] [John] [Paul]
[Green], [John] [David] [Paul] [Peter]

但有些事情告诉我,我真的不需要创建第二个文件/数据结构,这看起来效率很低。

这是一个更大的问题......

如果我需要找到谁喜欢 David 喜欢的任何组合怎么办?我的结果是……

Blue and red and green  =   Paul, David, Peter
Blue and red = Paul, David, Peter
Blue and green = John, Paul, David, Peter
Red and Green = Paul, David, Peter

我的问题是。

是否有更好的方法来构建数据/记录,以便我可以找出 Bob 和 Paul 的共同点(蓝色和白色)或红色和白色的共同点(David 和 Paul)?

我想我需要指出,我已尝试简化上面的示例。实际上,Tlikes.Name 的数据将是类似...的字符串

‘decabbadc’
‘bacddbcad’
‘eebadeaac’

这些字符串中大约有 200k+ 个。 Tlikes.FavColours 数据是一个文件名(这些文件大约有 2k 个)。文件名表示包含 Tlikes.Name 字符串的文件。

我希望能够检索给定 Tlikes.Name 字符串的文件名列表或给定文件名的字符串列表。

注意——有些东西吸引我去“集合”,但据我所知,集合中的元素数量有限,我走的路对吗?

感谢您花时间阅读这篇文章。

最佳答案

这是一个通用集,TSet<T>它可以用作获取数据之间关系的工具。

TSet<T>可以保存简单类型的数据,不像普通的那样限制字节大小 Set类型。

支持:

  • 包括(添加)
  • 排除(减法)
  • 相交(互含、相乘)
  • 对称差(互斥、异或)
  • 测试包含(在运算符中)
  • 相等性测试(等于运算符)
  • 测试(>= 运算符)的超集
  • 测试 ( <= operator) 的子集
  • 排序
  • 二分搜索

使用 TSet<T>对您的应用程序进行基准测试。


unit GenericSet;

interface

Uses
System.Generics.Defaults,
System.Generics.Collections;

Type
TSet<T> = record
// Include (union)
class operator Add(const aSet: TSet<T>; aValue: T) : TSet<T>; overload;
class operator Add(const aSet: TSet<T>; const aTArr: TArray<T>) : TSet<T>; overload;
class operator Add(const aSet1: TSet<T>; const aSet2: TSet<T>) : TSet<T>; overload;
// Exclude
class operator Subtract(const aSet: TSet<T>; aValue: T): TSet<T>; overload;
class operator Subtract(const aSet: TSet<T>; const aTArr: TArray<T>) : TSet<T>; overload;
class operator Subtract(const aSet1: TSet<T>; const aSet2: TSet<T>) : TSet<T>; overload;
// left in right, i.e right.Contains(left)
class operator In(aValue: T; const aSet: TSet<T>): Boolean; overload;
class operator In(const aTArr: TArray<T>; const aSet: TSet<T>): Boolean; overload;
class operator In(const aSet1: TSet<T>; const aSet2: TSet<T>): Boolean; overload;
// Intersect, mutually common, A and B
class operator Multiply(const aSet: TSet<T>; aValue: T): TSet<T>; overload;
class operator Multiply(const aSet: TSet<T>; const aTArr: TArray<T>): TSet<T>; overload;
class operator Multiply(const aSet1,aSet2 : TSet<T>): TSet<T>; overload;
// Symmetric difference, A xor B = (A+B) - A.Intersect(B)
class operator LogicalXor(const aSet: TSet<T>; aValue: T): TSet<T>; overload;
class operator LogicalXor(const aSet: TSet<T>; aTArr: TArray<T>): TSet<T>; overload;
class operator LogicalXor(const aSet1,aSet2 : TSet<T>): TSet<T>; overload;
//
class operator Equal(const aSet: TSet<T>; aValue: T): Boolean; overload;
class operator Equal(const aSet: TSet<T>; aTArr: TArray<T>): Boolean; overload;
class operator Equal(const aSetLeft,aSetRight: TSet<T>): Boolean; overload;
// SubsetOf (Left <= Right)
class operator LessThanOrEqual(const aSet: TSet<T>; aValue: T): Boolean; overload;
class operator LessThanOrEqual(const aSet: TSet<T>; aTArr: TArray<T>): Boolean; overload;
class operator LessThanOrEqual(const aSetLeft,aSetRight: TSet<T>): Boolean; overload;
// SupersetOf (Left >= Right)
class operator GreaterThanOrEqual(const aSet: TSet<T>; aValue: T): Boolean; overload;
class operator GreaterThanOrEqual(const aSet: TSet<T>; aTArr: TArray<T>): Boolean; overload;
class operator GreaterThanOrEqual(const aSetLeft,aSetRight: TSet<T>): Boolean; overload;
// Set creator
class function Create(const aTArr: array of T; checkDuplicates: Boolean = False): TSet<T>; static;
private
FSetArray : array of T;
FSorted : String; // !! Will be predefined as '' (=False) by compiler.
function GetEmpty: Boolean; inline;
function GetItem(index: Integer): T; inline;
function GetItemCount: Integer; inline;
function GetSorted: Boolean; inline;
procedure SetSorted( sorted: Boolean); inline;
public
// Add
procedure Include(aValue: T); overload;
procedure Include(const aTArr: TArray<T>); overload;
procedure Include(const aTArr: array of T); overload;
procedure Include(const aSet: TSet<T>); overload;
// Subtract; A=[1,2,3]; B=[2,3,4]; B.Exclude(A) = B-A = [4]
procedure Exclude(aValue: T); overload;
procedure Exclude(const aTArr: TArray<T>); overload;
procedure Exclude(const aTArr: array of T); overload;
procedure Exclude(const aSet: TSet<T>); overload;
// Multiply (A and B) A=[1,2,3]; B=[2,3,4]; B.Intersect(A) = B*A = [2,3]
function Intersect(aValue: T): TSet<T>; overload;
function Intersect(const aTArr: TArray<T>): TSet<T>; overload;
function Intersect(const aTArr: array of T): TSet<T>; overload;
function Intersect(const aSet: TSet<T>): TSet<T>; overload;

// A xor B; A=[1,2,3]; B=[2,3,4]; (A+B)-A.Intersect(B) = [1,4]
function SymmetricDiff(aValue: T): TSet<T>; overload;
function SymmetricDiff(const aTArr: TArray<T>): TSet<T>; overload;
function SymmetricDiff(const aTArr: array of T): TSet<T>; overload;
function SymmetricDiff(const aSet: TSet<T>): TSet<T>; overload;
// Identical set
function Equal(aValue: T): Boolean; overload;
function Equal(const aTArr: array of T; checkDuplicates: Boolean = False): Boolean; overload;
function Equal(const aTArr: TArray<T>; checkDuplicates: Boolean = False): Boolean; overload;
function Equal(const aSet: TSet<T>): Boolean; overload;
// Self <= aSet
function SubsetOf(aValue: T): Boolean; overload;
function SubsetOf(const aTArr: array of T; checkDuplicates: Boolean = False): Boolean; overload;
function SubsetOf(const aTArr: TArray<T>; checkDuplicates: Boolean = False): Boolean; overload;
function SubsetOf(const aSet: TSet<T>): Boolean; overload;
// Self >= aSet
function SupersetOf(aValue: T): Boolean; overload;
function SupersetOf(const aTArr: array of T; checkDuplicates: Boolean = False): Boolean; overload;
function SupersetOf(const aTArr: TArray<T>; checkDuplicates: Boolean = False): Boolean; overload;
function SupersetOf(const aSet: TSet<T>): Boolean; overload;
// Is included
function Contains(aValue: T): Boolean; overload;
function Contains(const aTArr: array of T): Boolean; overload;
function Contains(const aTArr: TArray<T>): Boolean; overload;
function Contains(const aSet: TSet<T>): Boolean; overload;

procedure Sort; // QuickSort
function Search( aValue: T): Boolean; // BinarySearch (Set must be sorted)
procedure Clear;
property IsSorted: Boolean read GetSorted;
property IsEmpty: Boolean read GetEmpty;
property Items[index: Integer]: T read GetItem; default;
property ItemCount: Integer read GetItemCount;
end;

implementation

class function TSet<T>.Create(const aTArr: array of T; checkDuplicates: Boolean = False): TSet<T>;
var
i,j,elements : Integer;
duplicate : Boolean;
c : IEqualityComparer<T>;
begin
if checkDuplicates then
begin
c := TEqualityComparer<T>.Default;
// This will remove duplicates
SetLength(Result.FSetArray,Length(aTArr));
elements := 0;
for i := 0 to High(aTArr) do
begin
duplicate := False;
for j := 0 to Pred(elements) do
begin
duplicate := c.Equals(Result.FSetArray[j],aTArr[i]);
if duplicate then
Break;
end;
if not duplicate then
begin
Result.FSetArray[elements] := aTArr[i];
Inc(elements);
end;
end;
SetLength(Result.FSetArray,elements);
end
else
begin
SetLength(Result.FSetArray, Length(aTArr));
for i := 0 to High(aTArr) do
Result.FSetArray[i] := aTArr[i];
end;
end;

class operator TSet<T>.Add(const aSet: TSet<T>; aValue: T): TSet<T>;
begin
Result := aSet;
Result.Include(aValue);
end;

class operator TSet<T>.Add(const aSet: TSet<T>; const aTArr: TArray<T>): TSet<T>;
begin
Result := aSet;
Result.Include(aTArr);
end;

class operator TSet<T>.Add(const aSet1, aSet2: TSet<T>): TSet<T>;
begin
Result := aSet1;
Result.Include(aSet2);
end;

procedure TSet<T>.Include(aValue: T);
begin
if not Contains(aValue) then begin
SetLength(FSetArray,Length(FSetArray)+1);
FSetArray[High(FSetArray)] := aValue;
SetSorted(False);
end;
end;

procedure TSet<T>.Include(const aSet: TSet<T>);
begin
if Self.IsEmpty then
Self := aSet
else
Include(aSet.FSetArray);
end;

procedure TSet<T>.Include(const aTArr: TArray<T>);
var
i : Integer;
begin
for i := 0 to High(aTArr) do
Self.Include(aTArr[i]);
end;

procedure TSet<T>.Include(const aTArr: array of T);
var
i : Integer;
begin
for i := 0 to High(aTArr) do
Self.Include(aTArr[i]);
end;

procedure TSet<T>.Exclude(const aTArr: TArray<T>);
var
i : Integer;
begin
for i := 0 to High(aTArr) do
Exclude(aTArr[i]);
end;

procedure TSet<T>.Exclude(const aTArr: array of T);
var
i : Integer;
begin
for i := 0 to High(aTArr) do
Exclude(aTArr[i]);
end;

procedure TSet<T>.Exclude(const aSet: TSet<T>);
begin
Exclude(aSet.FSetArray);
end;

procedure TSet<T>.Exclude(aValue: T);
var
i : Integer;
c : IEqualityComparer<T>;
begin
c := TEqualityComparer<T>.Default;
for i := 0 to High(FSetArray) do
begin
if c.Equals(FSetArray[i],aValue) then
begin
SetLength(FSetArray,Length(FSetArray)); // Ensure unique dyn array
if (i < High(FSetArray)) then
begin
FSetArray[i] := FSetArray[High(FSetArray)]; // Move last element
Self.SetSorted(False);
end;
SetLength(FSetArray,Length(FSetArray)-1);
Break;
end;
end;
end;

class operator TSet<T>.Subtract(const aSet1, aSet2: TSet<T>): TSet<T>;
begin
Result := aSet1;
Result.Exclude(aSet2.FSetArray);
end;

class operator TSet<T>.Subtract(const aSet: TSet<T>;
const aTArr: TArray<T>): TSet<T>;
begin
Result := aSet;
Result.Exclude(aTArr);
end;

class operator TSet<T>.Subtract(const aSet: TSet<T>; aValue: T): TSet<T>;
begin
Result := aSet;
Result.Exclude(aValue);
end;

class operator TSet<T>.In(aValue: T; const aSet: TSet<T>): Boolean;
begin
Result := aSet.Contains(aValue);
end;

class operator TSet<T>.In(const aTArr: TArray<T>; const aSet: TSet<T>): Boolean;
begin
Result := aSet.Contains(aTArr);
end;

class operator TSet<T>.In(const aSet1: TSet<T>; const aSet2: TSet<T>): Boolean;
begin
Result := aSet2.Contains(aSet1.FSetArray);
end;

function TSet<T>.Contains(aValue: T): Boolean;
var
i : Integer;
c : IEqualityComparer<T>;
begin
if IsSorted then
begin
Result := Search(aValue);
end
else
begin
Result := false;
c := TEqualityComparer<T>.Default;
for i := 0 to High(FSetArray) do
if c.Equals(FSetArray[i],aValue) then
Exit(True);
end;
end;

function TSet<T>.Contains(const aTArr: array of T): Boolean;
var
i: Integer;
begin
Result := High(aTArr) >= 0;
for i := 0 to High(aTArr) do
begin
if IsSorted then
Result := Search(aTArr[i])
else
Result := Contains(aTArr[i]);
if not Result then
Exit(false);
end;
end;

function TSet<T>.Contains(const aTArr: TArray<T>): Boolean;
var
i : Integer;
begin
Result := High(aTArr) >= 0;
for i := 0 to High(aTArr) do
begin
if IsSorted then
Result := Search(aTArr[i])
else
Result := Contains(aTArr[i]);
if not Result then
Exit(false);
end;
end;

function TSet<T>.Contains(const aSet: TSet<T>): Boolean;
begin
Result := Contains(aSet.FSetArray);
end;

function TSet<T>.GetEmpty: Boolean;
begin
Result := (Self.ItemCount = 0);
end;

function TSet<T>.GetItem(index: Integer): T;
begin
Result := Self.FSetArray[index];
end;

function TSet<T>.GetItemCount: Integer;
begin
Result := Length(Self.FSetArray);
end;

procedure TSet<T>.Clear;
begin
SetLength(FSetArray,0);
Self.SetSorted(False);
end;

// Get the mutually common elements, aka the intersect.
class operator TSet<T>.Multiply(const aSet: TSet<T>; aValue: T): TSet<T>;
begin
Result:= aSet.Intersect(aValue);
end;

class operator TSet<T>.Multiply(const aSet: TSet<T>; const aTArr: TArray<T>): TSet<T>;
begin
Result:= aSet.Intersect(aTArr);
end;

class operator TSet<T>.Multiply(const aSet1,aSet2: TSet<T>): TSet<T>;
begin
Result := aSet1.Intersect(aSet2);
end;

function TSet<T>.Intersect(aValue : T): TSet<T>;
var
i : Integer;
begin
if Self.Contains(aValue) then
Result.Include(aValue)
else
Result.Clear;
Result.SetSorted(Result.ItemCount = 1);
end;

function TSet<T>.Intersect(const aSet: TSet<T>): TSet<T>;
var
i,items : Integer;
begin
SetLength(Result.FSetArray,aSet.ItemCount);
items := 0;
for i := 0 to High(aSet.FSetArray) do
begin
if Self.Contains(aSet.FSetArray[i]) then
begin
Result.FSetArray[items] := aSet.FSetArray[i];
Inc(items);
end;
end;
SetLength(Result.FSetArray,items);
Result.SetSorted(Self.IsSorted and aSet.IsSorted);
end;

function TSet<T>.Intersect(const aTArr: array of T): TSet<T>;
var
i : Integer;
begin
for i := 0 to High(aTArr) do
begin
if Self.Contains(aTArr[i]) then
Result.Include(aTArr[i]);
end;
Result.SetSorted(False);
end;

function TSet<T>.Intersect(const aTArr: TArray<T>): TSet<T>;
var
i : Integer;
begin
for i := 0 to High(aTArr) do
begin
if Self.Contains(aTArr[i]) then
Result.Include(aTArr[i]);
end;
Result.SetSorted(False);
end;

//
function TSet<T>.Equal(aValue: T): Boolean;
begin
Result := (Self.ItemCount = 1) and Self.Contains(aValue);
end;

function TSet<T>.Equal(const aTArr: array of T; checkDuplicates: Boolean = False): Boolean;
begin
if checkDuplicates then
Result :=
(Self.ItemCount <= Length(aTArr)) and
Self.Equal(TSet<T>.Create(aTArr,True)) // Remove possible duplicates
else
Result :=
(Self.ItemCount = Length(aTArr)) and
Self.Contains(aTArr);
end;

function TSet<T>.Equal(const aTArr: TArray<T>; checkDuplicates: Boolean = False): Boolean;
begin
if checkDuplicates then
Result :=
(Self.ItemCount <= Length(aTArr)) and
Self.Equal(TSet<T>.Create(aTArr,True)) // Remove possible duplicates
else
Result :=
(Self.ItemCount = Length(aTArr)) and
Self.Contains(aTArr);
end;

function TSet<T>.Equal(const aSet: TSet<T>): Boolean;
begin
Result :=
(Self.ItemCount = aSet.ItemCount) and
Contains(aSet);
end;

class operator TSet<T>.Equal(const aSet: TSet<T>; aValue: T): Boolean;
begin
Result := aSet.Equal(aValue);
end;

class operator TSet<T>.Equal(const aSet: TSet<T>; aTArr: TArray<T>): Boolean;
begin
Result := aSet.Equal(aTArr,True);
end;

class operator TSet<T>.Equal(const aSetLeft,aSetRight: TSet<T>): Boolean;
begin
Result := aSetLeft.Equal(aSetRight);
end;

// Self <= aSet
function TSet<T>.SubsetOf(aValue: T): Boolean;
begin
Result := (Self.ItemCount = 1) and Self.Equal(aValue);
end;

function TSet<T>.SubsetOf(const aTArr: array of T; checkDuplicates: Boolean = False): Boolean;
begin
Result := Self.SubsetOf(TSet<T>.Create(aTArr,checkDuplicates));
end;

function TSet<T>.SubsetOf(const aTArr: TArray<T>; checkDuplicates: Boolean = False): Boolean;
begin
Result := SubsetOf(TSet<T>.Create(aTArr,checkDuplicates));
end;

function TSet<T>.SubsetOf(const aSet: TSet<T>): Boolean;
begin
Result :=
(Self.ItemCount <= aSet.ItemCount) and
aSet.Contains(Self);
end;

// SubsetOf (Left <= Right)
class operator TSet<T>.LessThanOrEqual(const aSet: TSet<T>; aValue: T): Boolean;
begin
Result := aSet.SubsetOf(aValue);
end;

class operator TSet<T>.LessThanOrEqual(const aSet: TSet<T>; aTArr: TArray<T>): Boolean;
begin
Result := aSet.SubsetOf(aTArr,True);
end;

class operator TSet<T>.LessThanOrEqual(const aSetLeft,aSetRight: TSet<T>): Boolean;
begin
Result := aSetLeft.SubsetOf(aSetRight);
end;

// Self >= aSet
function TSet<T>.SupersetOf(const aSet: TSet<T>): Boolean;
begin
Result :=
(Self.ItemCount >= aSet.ItemCount) and
Self.Contains(aSet);
end;

function TSet<T>.SupersetOf(aValue: T): Boolean;
begin
Result := (Self.ItemCount >= 1) and Self.Contains(aValue);
end;

function TSet<T>.SupersetOf(const aTArr: array of T; checkDuplicates: Boolean = False): Boolean;
begin
Result := SupersetOf(TSet<T>.Create(aTArr,checkDuplicates));
end;

function TSet<T>.SupersetOf(const aTArr: TArray<T>; checkDuplicates: Boolean = False): Boolean;
begin
Result := SupersetOf(TSet<T>.Create(aTArr,checkDuplicates));
end;

// SupersetOf (Left >= Right)
class operator TSet<T>.GreaterThanOrEqual(const aSet: TSet<T>; aValue: T): Boolean;
begin
Result := aSet.SupersetOf(aValue);
end;

class operator TSet<T>.GreaterThanOrEqual(const aSet: TSet<T>; aTArr: TArray<T>): Boolean;
begin
Result := aSet.SupersetOf(aTArr,True);
end;

class operator TSet<T>.GreaterThanOrEqual(const aSetLeft,aSetRight: TSet<T>): Boolean;
begin
Result := aSetLeft.SupersetOf(aSetRight);
end;

// A xor B; A=[1,2,3]; B=[2,3,4]; (A+B)-A.Intersect(B) = [1,4] alt:
function TSet<T>.SymmetricDiff(aValue: T): TSet<T>;
begin
Result := Self;
Result.Include(aValue);
Result.Exclude(Self.Intersect(aValue));
Result.SetSorted(False);
end;

function TSet<T>.SymmetricDiff(const aTArr: TArray<T>): TSet<T>;
begin
Result := Self;
Result.Include(aTArr);
Result.Exclude(Self.Intersect(aTArr));
Result.SetSorted(False);
end;

function TSet<T>.SymmetricDiff(const aTArr: array of T): TSet<T>;
begin
Result := Self;
Result.Include(aTArr);
Result.Exclude(Self.Intersect(aTArr));
Result.SetSorted(False);
end;

function TSet<T>.SymmetricDiff(const aSet: TSet<T>): TSet<T>;
begin
Result:= Self;
Result.Include(aSet);
Result.Exclude(Self.Intersect(aSet));
Result.SetSorted(False);
end;

class operator TSet<T>.LogicalXor(const aSet: TSet<T>; aValue: T): TSet<T>;
begin
Result := aSet.SymmetricDiff(aValue);
end;

class operator TSet<T>.LogicalXor(const aSet: TSet<T>; aTArr: TArray<T>): TSet<T>;
begin
Result := aSet.SymmetricDiff(aTArr);
end;

class operator TSet<T>.LogicalXor(const aSet1,aSet2 : TSet<T>): TSet<T>;
begin
Result := aSet1.SymmetricDiff(aSet2);
end;

procedure TSet<T>.Sort;
begin
SetLength(Self.FSetArray,Length(Self.FSetArray)); // Ensure COW
TArray.Sort<T>(Self.FSetArray);
SetSorted(True);
end;

function TSet<T>.Search(aValue: T): Boolean;
var
Index: Integer;
begin
Result := TArray.BinarySearch<T>(Self.FSetArray,aValue,Index);
end;

function TSet<T>.GetSorted: Boolean;
begin
Result := (FSorted = '1');
end;

procedure TSet<T>.SetSorted(sorted: Boolean);
begin
if sorted then
FSorted := '1'
else
FSorted := '0';
end;

end.

基准:

program ProjectGenericSet;

{$APPTYPE CONSOLE}

uses
System.Diagnostics,
System.Generics.Defaults,
System.Generics.Collections,
GenericSet in 'GenericSet.pas';

var
set1,set2,set3 : TSet<Word>;
sw : TStopWatch;
ok : Boolean;
i,j,max: Integer;
begin
Randomize;
max := $10000;
// Populate a sample set with 32K items.
repeat
set1.Include(Random(max));
until (set1.ItemCount = (max DIV 2));
// Populate a test set with items in sample set
repeat
set2.Include(set1[Random(max DIV 2)]);
until (set2.ItemCount = 100);
WriteLn('Test in Sample (unsorted), 1.000 iterations...');
sw := TStopWatch.StartNew;
for i := 1 TO 1000 DO
ok := set1.Contains(set2);
sw.Stop;
WriteLn('Result:',ok,' ',sw.ElapsedMilliseconds,' [ms]');
set1.Sort; // Sort
WriteLn('Test in Sample (sorted), 200.000 iterations...');
sw := TStopWatch.StartNew;
for i := 1 TO 200000 DO
begin
ok := set1.Contains(set2);
end;
sw.Stop;
WriteLn('Result:',ok,' ',sw.ElapsedMilliseconds,' [ms]');
WriteLn('Test*Test (unsorted), 200.000 iterations...');
sw := TStopWatch.StartNew;
for i := 1 TO 200000 DO
begin
set3 := set2.Intersect(set2);
end;
sw.Stop;
WriteLn('Result:',set3=set2,' ',sw.ElapsedMilliseconds,' [ms]');
set2.Sort;
WriteLn('Test*Test (sorted), 200.000 iterations...');
sw := TStopWatch.StartNew;
for i := 1 TO 200000 DO
begin
set3 := set2.Intersect(set2);
end;
sw.Stop;
WriteLn('Result:',set3=set2,' ',sw.ElapsedMilliseconds,' [ms]');
ReadLn;
end.

关于arrays - 查找两个数组中的公共(public)元素,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19466038/

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