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- #include <bits/stdc++.h>
- #define pb push_back
- #define mp make_pair
- #define x first
- #define y second
- using namespace std;
- typedef long long ll;
- int main()
- {
- freopen("encryption.in", "r", stdin);
- freopen("encryption.out", "w", stdout);
- ll n, m, l, r, l1, r1, vl, an, ps, kl, kt;
- cin >> l >> r;
- kl = 1;
- vl = 9;
- an = 0;
- ps = 0;
- while (ps + kl * vl <= l - 1)
- {
- an += vl;
- ps += kl * vl;
- vl *= ll(10);
- kl++;
- }
- //cout << ps << endl;
- if (l < 10)
- an = l;
- else if (ps == l - 1)
- an++;
- else
- {
- kt = ll(l - ps - 2) / kl + 1;
- ps += kt * kl + 1;
- an += kt + 1;
- }
- l1 = an;
- kl = 1;
- vl = 9;
- an = 0;
- ps = 0;
- while (ps + kl * vl <= r)
- {
- an += vl;
- ps += kl * vl;
- vl *= ll(10);
- kl++;
- }
- if (r < 10)
- an = r;
- else if (ps != r)
- {
- kt = ll(r - ps) / kl;
- ps += kt * kl;
- an += kt;
- }
- r1 = an;
- if (l1 > r1)
- cout << 0 << endl;
- else
- cout << r1 - l1 + 1 << endl;
- return 0;
- }
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