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#include <iostream>
#include <map>
using namespace std;
int main() {
int n;
cin >> n;
map<int, int> count;
for (int i = 0; i < n; i++) {
int x;
cin >> x;
count[x]++;
}
int ans = 0;
for (auto p : count) {
int x = p.second;
ans += (x * (x - 1)) / 2;
}
cout << ans;
return 0;
}
#include <bits/stdc++.h>
using namespace std;
int main()
{
long a[105], i,n,max,vt;
cout<<"n="; cin>>n;
for (i=1; i<=n; i++)
{
cout<<"A["<<i<<"]="; cin>>a[i];
}
max=a[1];
for (i=1; i<=n; i++)
if (max<a[i]) max=a[i];
vt=1;
for (i=1; i<=n; i++)
if (max==a[i]) vt=i;
cout<<max<<endl;
cout<<vt;
return 0;
}
#include <bits/stdc++.h>
using namespace std;
long long a[100],n,i,ln,nn,vt1,vt2;
int main()
{
cin>>n;
for (i=1; i<=n; i++) cin>>a[i];
ln=a[1];
nn=a[1];
for (i=1; i<=n; i++)
{
ln=max(ln,a[i]);
nn=min(nn,a[i]);
}
cout<<ln<<" "<<nn;
return 0;
}
Var n,i,vtl,vtn,so max,min:integer;
Begin
Write('Nhap so luong so = ');readln(n);
vtl:=0;
vtn:=0;
max:=-32768;
min:=32767;
For i:=1 to n do
Begin
Write('Nhap vao so thu ',i);readln(so);
If so > max then
Begin
Max:=so;
vtl:=i;
End;
If so < min then
Begin
Min:=so;
vtn:=i;
End;
Writeln('So lon nhat la ',max,' tai vi tri thu ',i);
Write('So nho nhat la ',min,' tai vi tri thu ',i);
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 
)
uses crt;
var a:array[1..10000]of integer;
i,n,kt,j:integer;
begin
clrscr;
readln(n);
for i:=1 to n do readln(a[i]);
for i:=1 to n do
if a[i]>1 then
begin
kt:=0;
for j:=2 to trunc(sqrt(a[i])) do
if a[i] mod j=0 then kt:=1;
if kt=0 then write(a[i]:4);
end;
readln;
end.
const fi='daycontd.inp';
fo='daycontd.out';
var a:array[1..100]of integer;
n,i,dn,dem:integer;
f1,f2:text;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,n);
for i:=1 to n do
read(f1,a[i]);
{---------------------------xu-ly-------------------------}
dn:=0;
dem:=1;
for i:=1 to n-1 do
if a[i+1]>a[i] then
begin
inc(dem);
if i+1=n then
begin
if dn<dem then
begin
dn:=dem;
end
else if (dn=dem) then
begin
dn:=dem;
end;
end;
end
else if a[i+1]<a[i] then
begin
if dn<dem then
begin
dn:=dem;
end
else if (dn=dem) then
begin
dn:=dem;
end;
dem:=1;
end;
writeln(f2,'do dai cua doan dai nhat la: ',dn);
close(f1);
close(f2);
end.
#include <bits/stdc++.h>
using namespace std;
const long long maxn=1e7+10;
long long a[maxn],i,n,ln;
int main()
{
freopen("capso.inp","r",stdin);
freopen("capso.out","w",stdout);
cin>>n;
for (i=1; i<=n; i++)
cin>>a[i];
sort(a+1,a+n+1);
ln=a[1]*a[2]*a[3];
for (i=2; i<=n-1; i++)
ln=max(ln,a[i-1]*a[i]*a[i+1]);
cout<<ln;
return 0;
}