제출 #359793

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
359793		entiki	Palindrome-Free Numbers (BOI13_numbers)	C++11	100 / 100	1 ms	640 KiB

numbers

#include <iostream>
#include <stdio.h>
#include <cstdint>
#include <cstring>
#include <queue>
#include <stack>
#include <time.h>
#include <map>
#include <algorithm>
#include <iomanip>
#include <cstdlib>

#define BIT(x,pos) (((x)>>(pos)) & 1LL)
#define _(x) (1LL<<(x))
#define cnt_bit(x) __builtin_popcountll(x)
#define turn_on(x,pos) ((x) |= (_(pos)))
#define turn_off(x,pos) ((x) &= ~(_(pos))
#define flip_bit(x,pos) ((x) ^= (_(pos))
#define low_bit(x) ((x) & (-x))
#define bit_on(x) (_(x)-1LL)

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef int64_t int64;
typedef long double ld;

typedef pair<int,int> pii;
typedef pair<ll,int> pli;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<pii> vpii;
typedef vector<pli> vpli;
typedef vector<ll> vll;

ll f[20][11][11][3][3];
ll a,b;

string convert_string(ll n)
{
    string res = "";
    for (;n > 0; n /= 10)
    {
        char tmp = (char)(n % 10 + '0');
        res = tmp + res;
    }
return res;
}

int get_digit(const string &s,int pos)
{
    return s[pos-1] - '0';
}

int get_len(const string &s)
{
    return s.size();
}

ll calc(int pos,int first_D,int second_D,bool is_less,bool not_first,int len,const string &s)
{
    if (pos > len) return 1;

    ll &ret = f[pos][first_D][second_D][is_less][not_first];
    if (ret != -1) return ret;

    ret = 0;
    int x = 9;
    if (is_less == false) x = get_digit(s,pos);

    for (int d = 0; d <= x; ++d)
        if (d != first_D && d != second_D)
        {
            int t_firstD = second_D;
            int t_secondD = d;
            bool new_notfirst = (not_first | (d > 0));

            if (new_notfirst == false && d == 0) t_secondD = 10;

            ret += calc(pos+1,t_firstD,t_secondD,is_less | (d < x),new_notfirst,len,s);
        }

return ret;
}

int main()
{
	ios::sync_with_stdio(false); cin.tie(nullptr);
    cin>>a>>b;

    if (a > b) swap(a,b);

    ll res_a = 0, res_b = 0;
    int len = 0;
    string sa = "" ,sb = "";

    if (a > 0)
    {
        memset(f,-1,sizeof(f));
        sa = convert_string(a-1);
        len = get_len(sa);
        res_a = calc(1,10,10,0,0,len,sa);
    } else res_a = 0;

    memset(f,-1,sizeof(f));
    sb = convert_string(b);
    len = get_len(sb);
    res_b = calc(1,10,10,0,0,len,sb);

    cout<<res_b - res_a;
}

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