Submission #1352158

#	Time	Username	Problem	Language	Result	Execution time	Memory
1352158		the_commando_x	Palindrome-Free Numbers (BOI13_numbers)	C++17	100 / 100	0 ms	344 KiB

numbers

// #pragma GCC optimize("O3")
#include <bits/stdc++.h>

using namespace std;

using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;

using pii = pair<int, int>;
using vii = vector<pii>;
using vvii = vector<vii>;

using l = long long;
using vl = vector<l>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;

using pll = pair<l, l>;
using vll = vector<pll>;
using vvll = vector<vll>;

using d = double;
using vd = vector<d>;
using vvd = vector<vd>;
using vvvd = vector<vvd>;

using ld = long double;
using vld = vector<ld>;
using vvld = vector<vld>;
using vvvld = vector<vvld>;

using vb = vector<bool>;
using vvb = vector<vb>;
using pbb = pair<bool, bool>;
using vbb = vector<pbb>;

#define ff first
#define ss second

#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int)(x).size()

void setIO(string name = "")
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if (!name.empty())
    {
        (void)freopen((name + ".in").c_str(), "r", stdin);
        (void)freopen((name + ".out").c_str(), "w", stdout);
    }
}

const ld pi = 3.14159265358979323846;

const l LINF = 1e18;
const l INF = 1e9;

const l MOD = 1e9 + 7;
// const l MOD = 998244353;

const l MAXN = 2e5 + 5;

l dp[20][11][11][2];

l solving(string &s, int pos, int prev, int prev1, bool flag)
{
    if (pos == s.size())
        return 1;

    l &res = dp[pos][prev + 1][prev1 + 1][flag];
    if (res != -1)
        return res;

    res = 0;
    int mxDigit = flag ? s[pos] - '0' : 9;

    for (int d = 0; d <= mxDigit; ++d)
    {
        bool nflag = flag && (d == mxDigit);

        if (prev == -1 && d == 0)
            res += solving(s, pos + 1, -1, -1, nflag);
        else if (d != prev && d != prev1)
            res += solving(s, pos + 1, d, prev, nflag);
    }

    return res;
}

l f(l x)
{
    string s = to_string(x);

    memset(dp, -1, sizeof(dp));

    return solving(s, 0, -1, -1, 1);
}

void solve()
{
    l a, b;
    cin >> a >> b;

    cout << f(b) - f(a - 1);
}

int main()
{
    setIO("");

#ifndef ONLINE_JUDGE
    // setIO("filename");
#endif

    int t = 1;
    // cin >> t;
    while (t--)
        solve();

    return 0;
}

Compilation message (stderr)

numbers.cpp: In function 'void setIO(std::string)':
numbers.cpp:53:22: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |         (void)freopen((name + ".in").c_str(), "r", stdin);
      |               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
numbers.cpp:54:22: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         (void)freopen((name + ".out").c_str(), "w", stdout);
      |               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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