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#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;
}
program hoidaptinhoc;
uses crt;
var K,N,X,Y,M,i : longint;
z : string;
BEGIN
clrscr;
writeln('Nhap so dong trong moi trang cua quyen sach: '); readln(K);
writeln('Nhap so thu tu cua dong: '); readln(N);
if (N mod K) = 0 then begin X:=N div K; Y:=K end;
if (N mod K) <> 0 then begin X:= (N div K) + 1; Y:=N mod K end;
M:=0;
for i:=1 to X do
begin
str(i,z);
M:=M+length(z);
end;
writeln('X= ',X,' Y= ',Y);
writeln('M= ',M);
readln;
END.
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 
)
#include <bits/stdc++.h>
using namespace std;
long n,i,dem,t;
int main()
{
cin>>n;
dem=0;
t=0;
for (i=1; i<=n;i++)
if (n%i==0)
{
dem++;
t=t+i;
}
cout<<dem<<" "<<t;
return 0;
}
câu 1
Program Nguyen_to;
Var n,i:integer;
Function NT(n:integer):Boolean;
Var ok: Boolean;
i: integer;
Begin ok:=true;
for i:=2 to n-1 do if (n mod i)= 0 then ok:=ok and false;
if n < 2 then NT:=false else NT:=ok;
End;
Begin Write('Nhap n: ');
Readln(n); i:=n;
Repeat i:=i+1;
Until NT(i);
Write('So nguyen to nho nhat lon hon ',n, 'la: ',i);
Readln End.
câu 2
uses crt;
const so: set of char=['0','1','2','3','4','5','6','7','8','9'];
var a:array[1..100] of integer;
st,b:string;
c,l,i,n,j:integer;
s, Max: integer;
begin clrscr;
write('Nhap xau:');
readln(st);
l:=length(st);
i:=1;
n:=0;
repeat if (st[i] in so) then begin b:='';
repeat b:=b+st[i];
inc(i);
until (not(st[i] in so)) or (i>l);
inc(n);
val(b,a[n],c);
end;
inc(i);
until i>l;
Max:=a[1];
for i:=2 to n do If Max<A[i] Then Max:=A[i];
Writeln('Phan tu lon nhat cua mang:', Max);
readln;
end.
Lời giải:
program hotrotinhoc;
var s: string;
x: longint;
begin
readln(x);
str(x,s);
write(length(s));
readln
end.
Lời giải:
program hotrotinhoc;
var max,min,i,x,k: integer;
begin
write('X='); readln(x);
write('K='); readln(k);
min:=32000; max:=0;
for i:=1 to x do if (x mod i=0) then
begin
(min>i) then min:=i;
if (max<i) then max:=i;
end;
writeln(min,' ',max);
write(sqr(x),' ',k-x);
readln
end.