Bài 1: 

#include <bits/stdc++.h>

using namespace std;

long long a[100],n,i,j,tam;

int main()

{

cin>>n;

for (i=1; i<=n; i++)

cin>>a[i];

for (i=1; i<=n-1; i++)

for (j=i+1; j<=n; j++)

if (a[i]<a[j]) swap(a[i],a[j]);

for (i=1; i<=n;i++)

cout<<a[i]<<" ";

return 0;

}

1)

Var array:[1..1000] of integer;

i,n,t:integer;

Begin

Write('n = ');readln(n);

For i:=1 to n do

Begin

Write('Nhap so thu ',i,' = ');readln(a[i]);

End;

For i:=1 to n do

If a[i] > a[i+1] then

Begin

t:=a[i];

a[i]:=a[i+1];

a[i+1]:=t;

End;

Write('Sap xep tang dan ');

For i:=1 to n do write(a[i]:8);

Readln

End.

2)

Var array:[1..1000] of integer;

i,n,t:integer;

Begin

Write('n = ');readln(n);

For i:=1 to n do

Begin

Write('Nhap so thu ',i,' = ');readln(a[i]);

End;

For i:=1 to n do

If a[i] < a[i+1] then

Begin

t:=a[i];

a[i]:=a[i+1];

a[i+1]:=t;

End;

Write('Sap xep giam dan ');

For i:=1 to n do write(a[i]:8);

Readln

End.

#include <bits/stdc++.h>

using namespace std;

long long a[100],b[100],c[100],n,i,dem1,dem2;

int main()

{

cin>>n;

for (i=1; i<=n; i++)

cin>>a[i];

dem1=0;

dem2=0;

for (i=1; i<=n; i++)

{

if (a[i]%2==0) 

{

dem1++;

b[dem1]=a[i];

}

else 

{

dem2=0;

c[dem2]=a[i];

}

}

sort(b+1,b+dem1+1);

sort(c+1,c+dem2+1);

for (i=1; i<=dem1; i++)

cout<<b[i]<<" ";

for (i=dem2; i>=1; i--)

cout<<c[i]<<" ";

return 0;

}

Làm giúp bài này nhé

uses crt;

var a:array[1..100]of integer;

i,n,min,tam,j:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do

begin

write('A[',i,']='); readln(a[i]);

end;

min:=a[1];

for i:=1 to n do 

  if min>a[i] then min:=a[i];

writeln('Gia tri nho nhat la: ',min);

for i:=1 to n-1 do 

  for j:=i+1 to n do 

if a[i]<a[j] then 

begin

tam:=a[i];

a[i]:=a[j];

a[j]:=tam;

end;

for i:=1 to n do write(a[i]:4);

readln;

end.

Program Tin_hoc;

Uses crt;

Var i,tam,n,chan,le,j:integer;

      a,daychan,dayle:array[1..10000] of integer;

Begin

clrscr;

Write('Nhap n: ');readln(n);

chan:=0;le:=0;

Writeln('Nhap ',n,' phan tu cua mang:');

For i:= 1 to n do 

Begin

write('A[',i,'] = ');

Readln(a[i]);

If a[i] mod 2 = 0 then 

  Begin

  inc(chan);

  daychan[chan]:=a[i];

  end

else

  Begin

  inc(le);

  dayle[le]:=a[i];

  End;

End;

For i:= 1 to chan do

  for j:= i to chan do If daychan[i]>daychan[j] then 

  Begin

  tam:=daychan[i];

  daychan[i]:=daychan[j];

  daychan[j]:=tam;

  End;

For i:= 1 to le do

  for j:= i to le do If dayle[i]<dayle[j] then 

  Begin

  tam:=dayle[i];

  dayle[i]:=dayle[j];

  dayle[j]:=tam

  End;

Writeln('Day sau khi sap xep:');

For i:= 1 to chan do write(daychan[i],'  ');

For i:= 1 to le do write(dayle[i],'  ');

Readln;

End.

#include <bits/stdc++.h>

using namespace std;

long long a[1000],n,i;

int main()

{

freopen("dayd.inp","r",stdin);

freopen("dayd.out","w",stdout);

cin>>n;

for (i=1; i<=n; i++) cin>>a[i];

for (i=1; i<=n; i++)

if (a[i]>0) cout<<a[i]<<" ";

return 0;

}

#include <bits/stdc++.h>

using namespace std;

long long a[10000],i,n,t;

int main()

{

freopen("avg.inp","r",stdin);

freopen("avg.out","w",stdout);

cin>>n;

for (i=1; i<=n; i++) cin>>a[i];

t=0;

for (i=1; i<=n; i++) t+=a[i];

cout<<fixed<<setprecision(1)<<(t*1.0)/(n*1.0);

return 0;

}