题解 | #车辆限行#

#include <iostream>
#include <sstream>
#include <string>
#include <vector>
using namespace std;

// 检查是否全是字母
bool isAllLetters(const string& s) {
    for(char c : s) {
        if(!(c >= 'A' && c <= 'Z')) return false;
    }
    return true;
}

// 获取尾号（从右向左第一个数字）
int getTailNumber(const string& plate) {
    for(int i = plate.length()-1; i >= 0; i--) {
        if(plate[i] >= '0' && plate[i] <= '9') {
            return plate[i] - '0';
        }
    }
    return -1;
}

int main() {
    string input;
    int weekday;
    getline(cin, input);
    cin >> weekday;
    
    // 检查输入是否为空
    if(input.empty()) {
        cout << "error" << endl;
        return 0;
    }
    
    stringstream ss(input);
    string plate;
    vector<string> restricted;
    
    while(getline(ss, plate, ',')) {
        // 检查车牌格式
        if(plate.length() != 5 || isAllLetters(plate)) {
            cout << "error" << endl;
            return 0;
        }
        
        int tail = getTailNumber(plate);
        if(tail == -1) {
            cout << "error" << endl;
            return 0;
        }
        
        // 根据星期几判断限行
        bool isRestricted = false;
        switch(weekday) {
            case 1: isRestricted = (tail == 1 || tail == 9); break;
            case 2: isRestricted = (tail == 2 || tail == 8); break;
            case 3: isRestricted = (tail == 3 || tail == 7); break;
            case 4: isRestricted = (tail == 4 || tail == 6); break;
            case 5: isRestricted = (tail == 5 || tail == 0); break;
        }
        
        if(isRestricted) restricted.push_back(plate);
    }
    
    if(restricted.empty()) cout << "none" << endl;
    else {
        for(size_t i = 0; i < restricted.size(); i++) {
            cout << restricted[i];
            if(i < restricted.size() - 1) cout << ",";
        }
        cout << endl;
    }
    
    return 0;
}

import java.util.*;

public class Main {
    // 检查是否全是字母
    static boolean isAllLetters(String s) {
        for(char c : s.toCharArray()) {
            if(!(c >= 'A' && c <= 'Z')) return false;
        }
        return true;
    }
    
    // 获取尾号
    static int getTailNumber(String plate) {
        for(int i = plate.length()-1; i >= 0; i--) {
            if(Character.isDigit(plate.charAt(i))) {
                return plate.charAt(i) - '0';
            }
        }
        return -1;
    }
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String input = sc.nextLine();
        int weekday = sc.nextInt();
        
        if(input.isEmpty()) {
            System.out.println("error");
            return;
        }
        
        String[] plates = input.split(",");
        List<String> restricted = new ArrayList<>();
        
        for(String plate : plates) {
            if(plate.length() != 5 || isAllLetters(plate)) {
                System.out.println("error");
                return;
            }
            
            int tail = getTailNumber(plate);
            if(tail == -1) {
                System.out.println("error");
                return;
            }
            
            boolean isRestricted = false;
            switch(weekday) {
                case 1: isRestricted = (tail == 1 || tail == 9); break;
                case 2: isRestricted = (tail == 2 || tail == 8); break;
                case 3: isRestricted = (tail == 3 || tail == 7); break;
                case 4: isRestricted = (tail == 4 || tail == 6); break;
                case 5: isRestricted = (tail == 5 || tail == 0); break;
            }
            
            if(isRestricted) restricted.add(plate);
        }
        
        if(restricted.isEmpty()) System.out.println("none");
        else System.out.println(String.join(",", restricted));
    }
}

def is_all_letters(s):
    return all(c.isupper() for c in s)

def get_tail_number(plate):
    for c in reversed(plate):
        if c.isdigit():
            return int(c)
    return -1

plates = input().strip()
weekday = int(input())

if not plates:
   print("error")
   exit()

plates = plates.split(',')
restricted = []

for plate in plates:
   if len(plate) != 5 or is_all_letters(plate):
       print("error")
       exit()
   
   tail = get_tail_number(plate)
   if tail == -1:
       print("error")
       exit()
   
   is_restricted = False
   if weekday == 1 and tail in [1, 9]: is_restricted = True
   elif weekday == 2 and tail in [2, 8]: is_restricted = True
   elif weekday == 3 and tail in [3, 7]: is_restricted = True
   elif weekday == 4 and tail in [4, 6]: is_restricted = True
   elif weekday == 5 and tail in [5, 0]: is_restricted = True
   
   if is_restricted:
       restricted.append(plate)

print("none" if not restricted else ",".join(restricted))