제출 #413064

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
413064		CodeChamp_SS	Palindrome-Free Numbers (BOI13_numbers)	C++17	96.25 / 100	2 ms	360 KiB

numbers

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;

#define ff                  first
#define ss                  second
#define pb                  push_back
#define eb                  emplace_back
#define mp                  make_pair
#define lb                  lower_bound
#define ub                  upper_bound
#define setbits(x)          __builtin_popcountll(x)
#define zrobits(x)          __builtin_ctzll(x)
#define sz(v)               (int)v.size()
#define ps(y)               cout << fixed << setprecision(y)
#define ms(arr, v)          memset(arr, v, sizeof(arr))
#define all(v)              v.begin(), v.end()
#define rall(v)             v.rbegin(), v.rend()
#define trav(x, v)          for(auto &x: v)
#define w(t)                int t; cin >> t; while(t--)
#define rep0(i, n)          for(int i = 0; i < n; i++)
#define rrep0(i, n)         for(int i = n - 1; i >= 0; i--)
#define rep1(i, n)          for(int i = 1; i <= n; i++)
#define rrep1(i, n)         for(int i = n; i > 0; i--)
#define inp(arr, n)         rep0(i, n) cin >> arr[i];
#define rep(i, a, b)        for(int i = a; i <= b; i++)
#define rrep(i, a, b)       for(int i = a; i >= b; i--)

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pii;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef vector<pii> vp;
typedef vector<bool> vb;
typedef vector<string> vs;
typedef map<ll, ll> mii;
typedef map<char, ll> mci;
typedef priority_queue<ll> pq_mx;
typedef priority_queue<ll, vi, greater<>> pq_mn;
typedef tree<ll, null_type, less<>, rb_tree_tag, tree_order_statistics_node_update> pbds;
/*
 * find_by_order(i) -> returns an iterator to the element at ith position (0 based)
 * order_of_key(i)  -> returns the position of element i (0 based)
 */

const int N = 2e5 + 5;
const int mod = 1e9 + 7;
//const int mod = 998244353;
const ll inf = 1e18;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void fio() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
}

string a, b;
ll dp[20][11][11][2];

ll f(int i, int b1, int b2, int eq, string &k) {
    if (i == sz(k)) return 1;
    if (dp[i][b1][b2][eq] != -1) return dp[i][b1][b2][eq];

    ll ans = 0;
    int j = eq ? ((k[i] - '0') + 1) : 10;
    rep0(x, j) {
        if (x == b1 or x == b2) continue;
        bool neq = eq & (x == k[i] - '0');
        bool leading0 = ((b2 == 10) & (x == 0));
        ans += f(i + 1, b2, leading0 ? 10 : x, neq, k);
    }

    return dp[i][b1][b2][eq] = ans;
}

int main() {
    fio();

    ll i, j;
    cin >> i >> j;
    if (i) --i;
    if (i == 0) a = "0";
    else {
        while (i) a += ((i % 10) + '0'), i /= 10;
    }
    if (j == 0) b = "0";
    else {
        while (j) b += ((j % 10) + '0'), j /= 10;
    }
    reverse(all(a)), reverse(all(b));
//    cout << a << " " << b << endl;
    ms(dp, -1);
    ll r1 = f(0, 10, 10, 1, b);
    ms(dp, -1);
    ll r2 = f(0, 10, 10, 1, a);
    cout << r1 - r2;

    return 0;
}

• Subtask 1: 21.25 / 25
• Subtask 2: 75 / 75