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1799. [Ahoi2009] self 同类分布
https://hydro.ac/d/bzoj/record/6322adbfbdf9bc31d16061fa
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BZOJ/1799/1799.cpp
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BZOJ/1799/1799.cpp
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#include <iostream>
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#include <bitset>
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#include <cstring>
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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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long long a, b, f[20][200][200], ans;
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int c[20], p;
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long long dfs(int len, int s, int x, bool limit) {
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if (s + 9 * len < p) return 0;
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if (!limit && f[len][s][x] != -1) return f[len][s][x];
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if (!len) return s == p && x == 0;
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int n = limit ? c[len] : 9;
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long long res = 0;
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for (int i = 0; i <= n && i + s <= p; i++)
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res += dfs(len - 1, s + i, (x * 10 + i) % p, limit && (i == c[len]));
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if (!limit) f[len][s][x] = res;
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return res;
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}
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long long calc(long long x) {
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int cnt = 0;
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while (x) {
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c[++cnt] = x % 10;
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x /= 10;
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}
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long long res = 0;
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for (p = 1; p <= cnt * 9; p++) {
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memset(f, 0xff, sizeof(f));
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res += dfs(cnt, 0, 0, 1);
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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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cout << calc(b) - calc(a - 1) << endl;
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return 0;
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}
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