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program tong_so_le;
var
n, i, a_i, tong: integer;
begin
writeln('Nhap vao so nguyen khong am n:');
readln(n);
while (n <= 0) or (n > 100) do
begin
writeln('So nguyen n phai thoa man 0 < n <= 100, vui long nhap lai:');
readln(n);
end;
writeln('Nhap vao ', n, ' so nguyen a1, a2, ..., an:','<mỗi số nguyên nhập trên một hàng>');
tong := 0; // Khởi tạo tổng bằng 0
for i := 1 to n do
begin
readln(a_i);
if i mod 2 = 1 then
tong := tong + a_i;
end;
writeln('Tong cac so tai vi tri le trong mang la: ', tong);
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 n,i,x,t,dem,j;
int main()
{
cin>>n;
x=n;
t=0;
while (n>0)
{
t=t+n%10;
n=n/10;
}
cout<<t;
dem=0;
for (i=2; i<=x; i++)
{
bool kt=true;
for (j=2; j*j<=i; j++)
if (i%j==0) kt=false;
if (kt==true) dem++;
}
cout<<dem;
return 0;
}
N = int(input())
A = 0
B = 0
So_uoc = 0
KQ = ""
for x in range(1, N):
if (x%2==0) and (x%3==0):
A += 1
if (x>0) and (N%x==0):
if (x>B):
B = x
for i in range(1, N+1):
if (N%i==0):
So_uoc += 1
if (So_uoc == 2):
KQ = "YES"
else:
KQ = "NO"
print(A)
print(B)
print(len(str(N)))
print(KQ)
(Chẳng biết đúng không đâu 
)
Bài 2:
#include <bits/stdc++.h>
using namespace std;
long long n,i;
//chuongtrinhcon
int demuoc(long long n)
{
int dem=0;
for (long long i=1; i<=n; i++)
if (n%i==0) dem++;
return (dem);
}
//chuongtrinhchinh
int main()
{
freopen("tamuoc.inp","r",stdin);
freopen("tamuoc.out","w",stdout);
cin>>n;
long long dem=0;
for (i=1; i<=n; i++)
if (demuoc(i)==3) dem++;
cout<<dem;
return 0;
}
1.
#include <bits/stdc++.h>
using namespace std;
int A,n,i;
int main()
{
cin>>n;
A=0;
For (i=0;i<=n;i++)
A=A+1/i;
cout<<A;
Return 0;
}
Program hotrotinhoc;
const fi='cau2.inp';
fo='cau2.out';
var f: text;
s: ansistring;
i,n,d,max,min: integer;
a: array[1..1000] of string;
procedure ip;
begin
assign(f,fi);
reset(f);
read(f,s);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
s:=s+' ';
while length(s)<>0 do
begin
inc(d);
min:=1001;
max:=0;
a[d]:=copy(s,1,pos(' ',s)-1);
delete(s,1, pos(' ',s));
end;
for i:=1 to d do
begin
if length(a[i])>max then max:=length(a[i]);
if length(a[i])<min then min:=length(a[i]);
end;
write(f,min,' ',max);
close(f);
end;
begin
ip;
out;
end.
Program HOC24;
const fi='Cau1.INP';
fo='Cau2.OUT';
var i,a,b,c,t,d: integer;
f: text;
function ucln(x,y: integer): integer;
var t: integer;
begin
while y<>0 do
begin
t:= x mod y;
x:=y;
y:=t;
end;
ucln:=x;
end;
procedure ip;
begin
assign(f,fi);
reset(f);
read(f,a,b,c);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
for i:=b to c do
begin
if i mod a=0 then write(f,i,' ');
t:=t+i;
end;
writeln(f);
while t<>0 do
begin
t:=t div 10;
inc(d);
end;
writeln(f,d);
if ucln(a,b,c)=1 then write(f,1) else write(f,0);
close(f);
end;
begin
ip;
out;
end.