제출 #495753

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
495753		Achileas	Palindrome-Free Numbers (BOI13_numbers)	C++17	100 / 100	2 ms	464 KiB

numbers

//
// Created by Le Gia Khanh
//
/* pray for luck UwU

                                  _
                               ooOoo
                              o8888888o
                              88" . "88
                              (| -_- |)
                              O\  =  /O
                           ___/`---'\___
                         .'  \|     |//  `.
                        /  \|||  :  |||//  \
                       /  ||||| -:- |||||  \
                       |   | \  -  /'| |   |
                       | \_|  `\`---'//  |_/ |
                       \  .-\__ `-. -'__/-.  /
                     ___. .'  /--.--\  . .'___
                  ."" '<  `.___\_<|>_/___.' _> \"".
                 | | :  - \. ;`. _/; .'/ /  .' ; |
                 \  \ -.   \_\_. _.'_/_/  -' _.' /
       ===========`-.`___`-.__\ \___  /__.-'.'.-'================
                               `=--=-'                    hjw
*/

#include <bits/stdc++.h>

using namespace std;

#define div awfiuskjdnvknj
#define fi first
#define pb push_back
#define mp make_pair
#define TASK "TASK"
#define se second
#define timeclock printf("\nTime elapsed: %dms", 1000 * clock() / CLOCKS_PER_SEC);

// 1 << __builtin_ctz(x). Compute the biggest power of 2 that is a divisor of x. Example: f(12) = 4
#define builtin_ctz __builtin_ctz
// 1 << (32 - __builtin_clz (x - 1)) Compute the smallest power of 2 that is not smaller than x. Example: f(12) = 16 
#define builtin_clz builtin_clz 
//count bit 1
#define __builtin_popcount __builtin_popcountll


template<class X, class Y>
    bool minimize(X &x, const Y &y) {
        X eps = 1e-9;
        if (x > y + eps) {
            x = y;
            return true;
        } else return false;
    }

template<class X, class Y>
    bool maximize(X &x, const Y &y) {
        X eps = 1e-9;
        if (x + eps < y) {
            x = y;
            return true;
        } else return false;
    } 

long long dp[20][11][11][2][2];

long long solve(bool ok, bool flag, int cur, int pre1, int pre2, string x){
    if (cur == x.size()){
        // cout << trace << "\n";
        return 1;
    }

    if (dp[cur][pre1][pre2][ok][flag] != -1)
        return dp[cur][pre1][pre2][ok][flag];

    int m = ok ? x[cur] - '0' : 9;
    long long res = 0;

    for (int i = 0; i <= m; i++){
        if (pre1 == i || pre2 == i)
            continue;

        int new_flag = flag && i == 0;
        int new_pre1 = 10, new_pre2 = 10;

        if (!new_flag)
            new_pre1 = pre2,
            new_pre2 = i;

        res += solve(ok & (i == m), new_flag, cur + 1, new_pre1, new_pre2, x);
    }

    return dp[cur][pre1][pre2][ok][flag] = res;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    long long a, b;
    cin >> a >> b;
    memset(dp, -1, sizeof dp);
    long long L = solve(1, 1, 0, 10, 10, to_string(a - 1));
    memset(dp, -1, sizeof dp);
    long long R = solve(1, 1, 0, 10, 10, to_string(b));
    cout << R - L;
    return 0;
}



/* stuff you should look for
    * int overflow, array bounds
    * special cases (n=1?)
    * do smth instead of nothing and stay organized
    * WRITE STUFF DOWN
    * DON'T GET STUCK ON ONE APPROACH
*/













// #ifdef ONLINE_JUDGE
//     freopen("input.inp", "r", stdin);
//     freopen("output.out", "w", stdout);
// #endif

컴파일 시 표준 에러 (stderr) 메시지

numbers.cpp: In function 'long long int solve(bool, bool, int, int, int, std::string)':
numbers.cpp:68:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |     if (cur == x.size()){
      |         ~~~~^~~~~~~~~~~

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