#include <bits/stdc++.h>
using namespace std;
unsigned long long a[1000],i,n,uc;
//chuongtrinhcon
unsigned long long ucln(long long a,long long b)
{
    if (b==0) return(a);
    else return(ucln(b,a%b));
}
//chuongtrinhchinh
int main()
{
    freopen("sn3.inp","r",stdin);
    freopen("uc.out","w",stdout);
    cin>>n;

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

uc=ucln(a[1],a[2]);

for (i=3; i<=n; i++)

uc=ucln(uc,a[i]);

cout<<uc;
    return 0;
}

nhờ viết thành pascal hộ nhé

uses crt;

const fi='dl.txt';

fo='soam.txt';

var f1,f2:text;

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

i,n:integer;

begin

clrscr;

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

n:=0;

while not eoln(f1) do 

  begin

n:=n+1;

read(f1,a[n]);

end;

for i:=1 to n do 

begin

  if a[i]>0 then writeln('Can bac hai cua ',a[i],' la: ',sqrt(a[i]):4:2)

else if a[i]<0 then write(f2,a[i]:4);

end;

close(f1);

close(f2);

readln;

end.

uses crt;

const fi='dl.txt';

fo='soam.txt';

var f1,f2:text;

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

i,n:integer;

begin

clrscr;

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

n:=0;

while not eoln(f1) do 

  begin

n:=n+1;

read(f1,a[n]);

end;

for i:=1 to n do 

begin

  if a[i]>0 then writeln('Can bac hai cua ',a[i],' la: ',sqrt(a[i]):4:2)

else if a[i]<0 then write(f2,a[i]:4);

end;

close(f1);

close(f2);

readln;

end.

uses crt;

const fi='bt.txt';

fo='soam.txt';

var f1,f2:text;

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

i,n:integer;

begin

clrscr;

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

n:=0;

while not eoln(f1) do 

  begin

n:=n+1;

read(f1,a[n]);

end;

for i:=1 to n do 

begin

  if a[i]>0 then writeln('Can bac hai cua ',a[i],' la: ',sqrt(a[i]):4:2)

else if a[i]<0 then write(f2,a[i]:4);

end;

close(f1);

close(f2);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

long long m,n,t,i;

int main()

{

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

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

cin>>m>>n;

t=0;

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

if (i%2!=0) t+=i;

cout<<t;

return 0;

}

Đề thiếu rồi bạn

Program HOC24;

var i,n: integer;

t: longint;

f1,f2: text;

begin

assign(f1,'BAI1.INP');

reset(f1);

read(f1,n);

t:=0;

for i:=1 to n do if i mod 2=0 then t:=t+i;

close(f1);

assign(f2,'BAI1.OUT');

rewrite(f2);

write(f2,t);

close(f2);

end.