gr8go,8,89

include <bits/stdc++.h>

using namespace std;
int n, scx = 1, sgh = 9;
int main()
{
ios::sync_with_stdio(0);
cin.tie();
cout.tie();

cin >> n;
n--;
while(n--)
{
    scx *= 10;
    sgh = (sgh * 10) + 9;
}
while(scx < sgh)
{
    if(scx % 3 == 0 && scx % 7 == 0)
    {
        cout << scx;
        exit(0); //
    }
    scx++;
}
cout << -1;
return 0;

}

no hope!

Fan cứng của Trần Thị Loli Trùm (Wibu con so 1 VN)

include <iostream>

include <bits/stdc++.h>

using namespace std;
long long n,z,l[10000],t[10000],i=1;
//int n;
int main()
{
freopen("tpn.inp","r",stdin);
freopen("tpn.out","w",stdout);
cin>>n;
//cout<<n;
while(z<=n)
{
l[i]=iii;
z=l[i];
t[i]=t[i-1]+l[i];
i++;
}
cout<<t[i-2]+l[i-2]*(n-l[i-2]);

return 0;

}

var n,m,i,x:longint;
a:array[1..1000] of longint;
tep1,tep2:text;
begin
assign(tep1,'YAL.inp'); reset(tep1);
assign(tep2,'YAL.out'); rewrite(tep2);
readln(tep1,n,m);
for i:=1 to m do
begin
read(tep1,x);
a[x]:=a[x]+1;
end;
for i:=1 to n do
if a[i]=0 then write(tep2,i,' ');
close(tep1);
close(tep2);
end.