Submission #967645

#	Time	Username	Problem	Language	Result	Execution time	Memory
967645		Mher777	Palindrome-Free Numbers (BOI13_numbers)	C++17	85 / 100	6 ms	600 KiB

numbers

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <array>
#include <string>
#include <algorithm>
#include <cmath>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <utility>
#include <random>
#include <cassert>
#include <fstream>
using namespace std;
mt19937 rnd(7069);

/* -------------------- Typedefs -------------------- */

typedef int itn;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef float fl;
typedef long double ld;

/* -------------------- Usings -------------------- */

using vi = vector<int>;
using vll = vector<ll>;
using mii = map<int, int>;
using mll = map<ll, ll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

/* -------------------- Defines -------------------- */

#define ff first
#define ss second
#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define mpr make_pair
#define yes cout<<"Yes\n"
#define no cout<<"No\n"
#define all(x) (x).begin(), (x).end()
#define USACO freopen("feast.in", "r", stdin); freopen("feast.out", "w", stdout);

/* -------------------- Constants -------------------- */

const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18) + 5ll;
const ll MOD = ll(1000000007);
const ll MOD2 = ll(998244353);

/* -------------------- Functions -------------------- */

void fastio() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

void precision(int x) {
    cout.setf(ios::fixed | ios::showpoint);
    cout.precision(x);
}

ll gcd(ll a, ll b) {
    if (a == 0 || b == 0) return(max(a, b));
    while (b) {
        a %= b;
        swap(a, b);
    }
    return a;
}

ll lcm(ll a, ll b) {
    return a / gcd(a, b) * b;
}

ll range_sum(ll a, ll b) {
    if (a > b) return 0ll;
    ll dif = a - 1, cnt = b - a + 1;
    ll ans = ((b - a + 1) * (b - a + 2)) / 2;
    ans += ((b - a + 1) * dif);
    return ans;
}

string dec_to_bin(ll a) {
    string s = "";
    for (ll i = a; i > 0; ) {
        ll k = i % 2;
        i /= 2;
        char c = k + 48;
        s += c;
    }
    if (a == 0) {
        s = "0";
    }
    reverse(all(s));
    return s;
}

ll bin_to_dec(string s) {
    ll num = 0;
    for (int i = 0; i < s.size(); i++) {
        num *= 2ll;
        num += (s[i] - '0');
    }
    return num;
}

ll factorial_by_mod(ll n, ll mod) {
    ll ans = 1;
    ll num;
    for (ll i = 1; i <= n; ++i) {
        num = i % mod;
        ans *= num;
        ans %= mod;
    }
    return ans;
}

int isPrime(ll a) {
    if (a == 1) return 0;
    for (ll i = 2; i * i <= a; i++) {
        if (a % i == 0) return 0;
    }
    return 1;
}

ll binpow(ll a, ll b) {
    if (!a) return 0;
    ll ans = 1;
    while (b) {
        if (b & 1) {
            ans *= a;
        }
        b >>= 1;
        a *= a;
    }
    return ans;
}

ll binpow_by_mod(ll a, ll b, ll mod) {
    if (!a) return 0;
    ll ans = 1;
    while (b) {
        if (b & 1) {
            ans *= a;
            ans %= mod;
        }
        b >>= 1;
        a *= a;
        a %= mod;
    }
    return ans;
}

/* -------------------- Solution -------------------- */

const int N = 21, M = 10, K = 3;
ll dp[N][M][M][K];

ll count(ll num) {
    if (num < 10) return num + 1ll;
    vll v;
    while (num) {
        v.pub(num % 10);
        num /= 10;
    }
    int n = (int)v.size();
    for (int x = 0; x < 10; ++x) {
        for (int y = 0; y < 10; ++y) {
            if (x == y) continue;
            if ((x < v[1]) || (x <= v[1] && y <= v[0])) {
                ++dp[1][x][y][0];
            }
            else {
                ++dp[1][x][y][1];
            }
        }
    }
    for (int i = 2; i < n; ++i) {
        for (int x = 0; x < 10; ++x) {
            for (int y = 0; y < 10; ++y) {
                for (int z = 0; z < 10; ++z) {
                    if ((x == y) || (y == z) || (x == z)) continue;
                    if (x < v[i]) {
                        dp[i][x][y][0] += dp[i - 1][y][z][0] + dp[i - 1][y][z][1];
                    }
                    else if (x == v[i]) {
                        dp[i][x][y][0] += dp[i - 1][y][z][0];
                        dp[i][x][y][1] += dp[i - 1][y][z][1];
                    }
                    else {
                        dp[i][x][y][1] += dp[i - 1][y][z][0] + dp[i - 1][y][z][1];
                    }
                }
            }
        }
    }
    ll ret = 0;
    for (int i = 0; i < n; ++i) {
        for (int x = 0; x < 10; ++x) {
            for (int y = 0; y < 10; ++y) {
                if (i == 0) ret += dp[n - 1][x][y][0];
                dp[i][x][y][0] = dp[i][x][y][1] = 0;
            }
        }
    }
    return ret;
}

bool check(ll a) {
    string s = to_string(a);
    bool f = true;
    for (int i = 0; i < s.size() - 1; ++i) {
        if (s[i] == s[i + 1] || (i + 2 < s.size() && s[i + 2] == s[i])) {
            f = false;
            break;
        }
    }
    return f;
}

void slv() {
    ll a, b;
    cin >> a >> b;
    ll ans = 0;
    if (b - a <= (ll)100000) {
        for (ll i = a; i <= b; ++i) {
            if (check(i)) ++ans;
        }
        cout << ans;
        return;
    }
    ans = count(b) - count(a);
    if (check(a)) ++ans;
    cout << ans;
}

void cs() {
    int tstc = 1;
    //cin >> tstc;
    while (tstc--) {
        slv();
    }
}

void precalc() {
    return;
}

int main() {
    fastio();
    precalc();
    //precision(0);
    cs();
    return 0;
}

Compilation message (stderr)

numbers.cpp: In function 'll range_sum(ll, ll)':
numbers.cpp:95:21: warning: unused variable 'cnt' [-Wunused-variable]
   95 |     ll dif = a - 1, cnt = b - a + 1;
      |                     ^~~
numbers.cpp: In function 'll bin_to_dec(std::string)':
numbers.cpp:118:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  118 |     for (int i = 0; i < s.size(); i++) {
      |                     ~~^~~~~~~~~~
numbers.cpp: In function 'bool check(ll)':
numbers.cpp:230:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  230 |     for (int i = 0; i < s.size() - 1; ++i) {
      |                     ~~^~~~~~~~~~~~~~
numbers.cpp:231:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  231 |         if (s[i] == s[i + 1] || (i + 2 < s.size() && s[i + 2] == s[i])) {
      |                                  ~~~~~~^~~~~~~~~~

• Subtask 1: 25 / 25
• Subtask 2: 60 / 75