Submission #1173414

#TimeUsernameProblemLanguageResultExecution timeMemory
1173414NurislamPalindrome-Free Numbers (BOI13_numbers)C++20
85 / 100
7 ms328 KiB
#include <bits/stdc++.h> using namespace std; #define int long long //#define pb push_back int inf = 1e18; const int mod = 1e9 + 7; const int N = 1e5 + 5; vector<int> pw(20, 1); int dig(int &va, int id){ return (va / pw[id]) %10; }; int sz(int x){ if(x <= 0) return 0; int len = 18; while(x / pw[len] == 0)len--; return len; }; map<array<int,4>, int> mp; int get (int la, int lla, int id, bool ispr, int lim) { if(lim < 0)return 0; if(id < 0)return 1; if(mp[{la, lla, id, ispr}]) return mp[{la, lla, id, ispr}]; int res = 0; int x = dig(lim, id); for(int i = 0; i < 10; i ++ ){ if(i == la || i == lla) continue; if(ispr && i > x)continue; if(ispr && i == x) res += get(i, la, id-1, 1, lim); else res += get(i, la, id-1, 0, lim); } //cout << la << ' ' << lla << ' ' << id << ' ' << ispr << ' ' << res << '\n'; //cout << lim << ' ' << id << ' ' << x << '\n'; return mp[{la, lla, id, ispr}] = res; }; void solve(){ for(int i = 1; i < 19; i ++ ) pw[i] = pw[i-1] * 10; auto ok = [&] (int x) -> bool { int len = sz(x); for(int i = 0; i + 1 <= len; i ++ ) { if(dig(x, i) == dig(x, i+1))return 0; if(i + 2 <= len && dig(x, i) == dig(x, i + 2))return 0; } return 1; }; int l, r; cin >> l >> r; if(r - l < 200000) { int ans = 0; for(int i = l; i <= r; i ++ ) { ans += ok(i); }; cout << ans << '\n'; return; }; r = get(-1, -1, sz(r), 1, r); mp.clear(); cout << r - get(-1, -1, sz(l), 1, l) + ok(l) << '\n'; }; signed main(){ ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); int tt = 1; //cin >> tt; while(tt -- ){ solve(); }; };
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