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74
LibreOJ/10165/10165.cpp
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74
LibreOJ/10165/10165.cpp
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#include <iostream>
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#include <cmath>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 15;
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int a, b, f[N][N];
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std::vector<int> gen(int x) {
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std::vector<int> res;
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while (x) {
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res.push_back(x % 10);
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x /= 10;
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}
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return res;
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}
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int calc(int x) {
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int res = 0;
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auto num = gen(x);
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for (int i = 1; i < num.size(); i++) {
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for (int j = 1; j < 10; j++) {
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res += f[i][j];
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}
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}
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for (int i = 1; i < *num.rbegin(); i++) {
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res += f[num.size()][i];
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}
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for (int i = num.size() - 1; i; i--) {
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for (int j = 0; j < num[i - 1]; j++) {
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if (std::abs(j - num[i]) >= 2) {
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res += f[i][j];
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}
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}
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if (std::abs(num[i] - num[i - 1]) < 2) break;
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}
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return res;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> a >> b;
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for (int i = 0; i < 10; i++) {
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f[1][i] = 1;
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}
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for (int i = 2; i <= 10; i++) {
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for (int j = 0; j < 10; j++) {
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for (int k = 0; k < 10; k++) {
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if (std::abs(j - k) >= 2) {
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f[i][j] += f[i - 1][k];
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}
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}
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}
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}
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cout << calc(b + 1) - calc(a) << endl;
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return 0;
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}
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