1:

#include <bits/stdc++.h>

using namespace std;

long long dem,i,n,x;

int main()

{

cin>>n;

dem=0;

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

{

cin>>x;

if (x%2==0) dem++;

}

cout<<dem;

return 0;

}

Câu 2: 

#include <bits/stdc++.h>

using namespace std;

long long x,n,i,t;

int main()

{

cin>>n;

t=0;

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

{

cin>>x;

if (x%3==0) t+=x;

}

cout<<t;

return 0;

}

Câu 3:

Var i,n:integer:

Begin

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

Write('Cac uoc cua n la ');

For i:=1 to n do

If n mod i = 0 then write(i:8);

Readln

End.

Câu 4

Var i,n:integer:

Begin

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

Write('Cac so le nho hon n la ');

For i:=1 to n - 1 do

If i mod 2 <> 0 then write(i:8);

Readln

End.

Câu 1:

Program HOC24;

var i,p: integer;

t: longint;

begin

write('Nhap P: '); readln(p);

t:=0;

for i:=1 to p do if i mod 2<>0 then t:=t+i;

write('Tong cac so le la: ',t);

readln

end.

Câu 2:

Program HOC24;

var i,n: integer;

t: longint;

begin

write('Nhap N: '); readln(n);

t:=0;

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

write('Tong cac so chan la: ',t);

readln

end.

Câu 3:

Program HOC24;

var i,t,n: integer;

begin

write('Nhap N: '); readln(n);

t:=0;

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

write('Tong cac uoc cua ',n,' la: ',t);

readln

end.

uses crt;

var n,i:integer;

begin

clrscr;

readln(n);

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

readln;

end.

n = int(input("Nhập vào số n: "))

if n <= 0:
    print("n phải lớn hơn 0")
else:
    for i in range(1, n+1):
        print(i)

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

i,n:integer;

Begin

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

For i:=1 to n do

Begin

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

End;

Write('Cac so vua nhap la ');

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

Readln

End.

Câu 1: 

uses crt;

var s,i:integer;

begin

clrscr;

s:=0;

for i:=1 to 10 do 

  s:=s+i;

writeln('Tong cua 10 so tu nhien dau tien la: ',s);

readln;

end.

Câu 2: 

uses crt;

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

i,n,dem:integer;

begin

clrscr;

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

for i:=1 to n do 

  begin

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

end;

dem:=0;

for i:=1 to n do

if a[i]>0 then inc(dem);

writeln('So luong phan tu duong la: ',dem);

readln;

end.

Câu 3: 

uses crt;

var i,j:integer;

begin

clrscr;

for i:=1 to 9 do 

  begin

      writeln('Bang nhan ',i,' la: ');

for j:=1 to 10 do 

  writeln(i,'*',j,'=',i*j);

delay(200);

end;

readln;

end.

giúp với

#include <bits/stdc++.h>

using namespace std;

string st;

int d,i,dem;

int main()

{

cin>>st;

d=st.length();

dem=0;

for (i=0; i<d; i++)

if (st[i]=='0') dem++;

cout<<dem;

return 0;

}

Var n,dem:longint;

Begin

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

While n >= 10 do

Begin

if n mod 10 = 0 then dem:=dem+1;

n:=n div 10;

End;

Write('So vua nhap co ',dem,' so 0');

Readln;

End.