---- 442 ----------------------------
#include <iostream>
using namespace std;
int main()
{
int n, a=0, b=0, va, m, ncif=1, i, z;
cin >> n;
m=n;
while (m>9)
{
++ncif; m/=10;
}
z=1;
for (i=1; i<=ncif/2; ++i) z*=10;
if (ncif%2==0) { a=n/z; b=n%z; }
else { a=n/z; b=n%z; a=a/10; }
va=a-b; if (va<0) va=-va;
cout << va << "\n";
return 0;
}
-------------------1723 ---------------------------
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("culegere.in");
ofstream g("culegere.out");
long long p, n, t, m, a, b, ult,i, z1;
int main()
{
f >> p >> n;
if (p%2) a=((p-1)/2)*p+1;
else a=(p/2)*(p-1)+1;
b=a+p-1;
ult=b;
long long z=1, nr=1;
while (b>9)
{
z=z*10; ++nr; b/=10;
}
b=ult;
if (b<10) t=b;
else
{
i=2; z1=90; t=0;
while (i<nr)
{
t=t+i*z1;
z1*=10; ++i;
}
t=9+t+(ult-z+1)*nr;
}
if (n==1) { m=1; }
else
{
b=0; m=0;
while (n>b)
{
++m; b+=m;
}
}
g << t << "\n";
g << m;
return 0;
}
