Submission #320321

#	Time	Username	Problem	Language	Result	Execution time	Memory
320321		Bua	Palindrome-Free Numbers (BOI13_numbers)	C++14	100 / 100	1 ms	364 KiB

numbers

#include <bits/stdc++.h>
using namespace std;

typedef double dd;
typedef long long ll;

ll k;

ll dp[20][11][11][2][2];

vector <int> convert(ll x)
{
    vector <int> v;
    if (x == 0)
    {
        v.push_back(0);
        return v;
    }
    while (x)
    {
        v.push_back(x % 10 + 1);
        x /= 10;
    }
    reverse(v.begin(), v.end());
    return v;
}

ll calc(const vector <int> &v, ll n, ll prev2, ll prev1, ll k0, ll f)
{
    // cout << n << " " << s << " " << f <<"\n";
    if (n == v.size())
    {
        return 1;
    }
    
    if (dp[n][prev2][prev1][k0][f] != -1) return dp[n][prev2][prev1][k0][f];

    int lim;
    if (f == 1) lim = 10;
    else lim = v[n];
    // cout << v[n] << "\n";

    ll res = 0;

    for (int i = 1; i <= lim; ++i)
    {
        int nf = f;
        if (i <lim) nf = 1;
        int nk0 = k0;
        if (i > 1) nk0 = 1;
        if (k0 == 0 && i == 1) 
        {
            res += calc(v, n + 1, prev2, prev1, k0, nf);
            continue;
        }
        if (prev2 != 0 && prev1 != 0 && i == prev2) continue;
        if (prev1 != 0 && i == prev1) continue;
        
        res += calc(v, n + 1, prev1, i, nk0, nf);
    }
    return dp[n][prev2][prev1][k0][f] = res;
}

ll solve(ll x)
{
    if (x <= 10) return x + 1;
    if (x < 100) return x + 1 - x / 11;
    for (ll i = 0; i < 20; ++i)
        for (ll j = 0; j < 11; ++j)
            for (ll z = 0; z < 11; ++z)
                for (ll t = 0; t < 2; ++t)
                    for (ll t1 = 0; t1 < 2; ++t1) dp[i][j][z][t][t1] = -1;
    vector <int> v = convert(x);
    // for (auto it :v) cout << it;
    // cout << "\n";
    return calc(v, 0, 0, 0, 0, 0);
    return 0;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    // freopen("input.inp", "r", stdin);
    // freopen("output.out", "w", stdout);
    
    int tc = 1;
    // cin >> tc;
    for (int i = 1; i <= tc; ++i)
    {
        ll a, b;
        cin >> a >> b >> k;
        ll res1 = solve(b);
        ll res2 = solve(a - 1);
        // cout << res1 << " " << res2 << '\n';
        cout << res1 - res2 << "\n";
        // cout <<"___----------------\n";
    }
    
}

Compilation message (stderr)

numbers.cpp: In function 'll calc(const std::vector<int>&, ll, ll, ll, ll, ll)':
numbers.cpp:31:11: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     if (n == v.size())
      |         ~~^~~~~~~~~~~

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