#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int NUM_LIMIT = 19;
const int REM = 2520; // NWW of all digits except 0
ll mp[NUM_LIMIT + 1][1 << 9][2][REM];
ll dp(const vector<int>& num, int i, int encountered, int can_choose_any, int remainder) {
ll& ans = mp[i][encountered][can_choose_any][remainder];
if (ans != -1) return ans;
if (i == num.size()) {
bool ok = true;
for(int i = 1; i < 10; i++) {
if((1 << (i - 1)) & encountered) {
if (remainder % i > 0) {
ok = false;
break;
}
}
}
ans = ok && encountered > 0 ? 1 : 0;
} else {
ans = 0;
for(int d = 0; d < 10; d++) {
if (can_choose_any == 0 && (num[i] < d)) continue;
if (encountered > 0 && d == 0) continue;
ans += dp(
num,
i + 1,
d == 0 ? encountered : encountered | 1 << (d - 1),
can_choose_any == 1 ? 1: d < num[i],
(10 * remainder + d) % REM
);
}
}
return ans;
}
ll solve(const ll l, const ll r) {
vector<int> left, right;
for(auto c : to_string(l - 1)) left.push_back(c - '0');
for(auto c : to_string(r)) right.push_back(c - '0');
memset(mp, -1, sizeof(mp));
auto L = dp(left, 0, 0, 0, 0);
memset(mp, -1, sizeof(mp));
auto R = dp(right, 0, 0, 0, 0);
// cout << "R: " << R << ", L: " << L << endl;
return R - L;
}
ll brute(ll l, ll r) {
int ans = 0;
for(long x = l; x <= r; x++) {
bool broken = false;
auto xstr = to_string(x);
for(auto c : xstr) {
if (c - '0' == 0 || x % (c - '0') > 0) {
broken = true;
break;
}
}
if(!broken) ans++;
}
return ans;
}
int main(int argc, char const *argv[]) {
ll l, r;
cin >> l >> r;
cout << solve(l, r) << endl;
// int n = 1*1000*1000;
// for(int l = 999965; l < n; l++) {
// for(int r = l; r < n; r++) {
// if(solve(l, r) == brute(l, r)) {
// cout << "\rok for l: " << l << ", r: " << r << flush;
// } else {
// cout << "bad for l" << l << ", r: " << r << endl;
// }
// }
// }
// cout << brute(l, r) << endl;
return 0;
}
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 | #include <bits/stdc++.h> using namespace std; typedef long long ll; const int NUM_LIMIT = 19; const int REM = 2520; // NWW of all digits except 0 ll mp[NUM_LIMIT + 1][1 << 9][2][REM]; ll dp(const vector<int>& num, int i, int encountered, int can_choose_any, int remainder) { ll& ans = mp[i][encountered][can_choose_any][remainder]; if (ans != -1) return ans; if (i == num.size()) { bool ok = true; for(int i = 1; i < 10; i++) { if((1 << (i - 1)) & encountered) { if (remainder % i > 0) { ok = false; break; } } } ans = ok && encountered > 0 ? 1 : 0; } else { ans = 0; for(int d = 0; d < 10; d++) { if (can_choose_any == 0 && (num[i] < d)) continue; if (encountered > 0 && d == 0) continue; ans += dp( num, i + 1, d == 0 ? encountered : encountered | 1 << (d - 1), can_choose_any == 1 ? 1: d < num[i], (10 * remainder + d) % REM ); } } return ans; } ll solve(const ll l, const ll r) { vector<int> left, right; for(auto c : to_string(l - 1)) left.push_back(c - '0'); for(auto c : to_string(r)) right.push_back(c - '0'); memset(mp, -1, sizeof(mp)); auto L = dp(left, 0, 0, 0, 0); memset(mp, -1, sizeof(mp)); auto R = dp(right, 0, 0, 0, 0); // cout << "R: " << R << ", L: " << L << endl; return R - L; } ll brute(ll l, ll r) { int ans = 0; for(long x = l; x <= r; x++) { bool broken = false; auto xstr = to_string(x); for(auto c : xstr) { if (c - '0' == 0 || x % (c - '0') > 0) { broken = true; break; } } if(!broken) ans++; } return ans; } int main(int argc, char const *argv[]) { ll l, r; cin >> l >> r; cout << solve(l, r) << endl; // int n = 1*1000*1000; // for(int l = 999965; l < n; l++) { // for(int r = l; r < n; r++) { // if(solve(l, r) == brute(l, r)) { // cout << "\rok for l: " << l << ", r: " << r << flush; // } else { // cout << "bad for l" << l << ", r: " << r << endl; // } // } // } // cout << brute(l, r) << endl; return 0; } |
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