美团笔试 美团测开笔试 0315
笔试时间:2025年03月15日
历史笔试传送门:
第一题
题目
普通快递:以"SF"开头,后跟10位数字特快专递:以"EX"开头,后跟2个大写字母和8位数字国际快递:以"IN"开头,后跟3个大写字母和6位数字,且最后两位数字之和必须是偶数电商快递:纯数字12位,且第一位不为0不符合上述规则的都是无效单号
输入描述
第一行输入n,表示快递的数量
接下来n行,每一行一个字符串表示快递单号
输出描述
对于每一个快递单号,输出其类型:
"Normal"(普通快递)
"Express"(特快专递)
"International"(国际快递)
"E-commerce"(电商快递)
"Invalid"(无效单号)
样例输入
5
SF1234567890
EXAB12345678
INABC123446
123456789012
SF12345
样例输出
Normal
Express
International
E-commerce
Invalid
参考题解
模拟。
C++:[此代码未进行大量数据的测试,仅供参考]
#include <bits/stdc++.h>
using namespace std;
void solve() {
string s;
cin >> s;
auto isUpperCase = [&](char c) -> bool {
return c >= 'A' && c <= 'Z';
};
auto isLowerCase = [&](char c) -> bool {
return c >= 'a' && c <= 'z';
};
auto isDigit = [&](char c) -> bool {
return c >= '0' && c <= '9';
};
if (s.size() < 2) {
cout << "Invalid" << "\n";
} else {
string prefix = s.substr(0, 2);
if (prefix == "SF") {
string suffix = s.substr(2);
if (suffix.size() != 10) {
cout << "Invalid" << "\n";
} else {
bool ok = true;
for (int i = 0; i < 10; i++) {
if (!isDigit(suffix[i])) ok = false;
}
if (ok) {
cout << "Normal" << "\n";
} else {
cout << "Invalid" << "\n";
}
}
} else if (prefix == "EX") {
string suffix = s.substr(2);
if (suffix.size() != 10) {
cout << "Invalid" << "\n";
} else {
bool ok = true;
for (int i = 0; i < 2; i++) {
if (!isUpperCase(suffix[i])) {
ok = false;
}
}
for (int i = 2; i < 10; i++) {
if (!isDigit(suffix[i])) {
ok = false;
}
}
if (ok) {
cout << "Express" << "\n";
} else {
cout << "Invalid" << "\n";
}
}
} else if (prefix == "IN") {
string suffix = s.substr(2);
if (suffix.size() != 9) {
cout << "Invalid" << "\n";
} else {
bool ok = true;
for (int i = 0; i < 3; i++) {
if (!isUpperCase(suffix[i])) {
ok = false;
}
}
for (int i = 3; i < 9; i++) {
if (!isDigit(suffix[i])) {
ok = false;
}
}
if ((suffix[8] - '0' + suffix[7] - '0') % 2 != 0) {
ok = false;
}
if (ok) {
cout << "International" << "\n";
} else {
cout << "Invalid" << "\n";
}
}
} else if (isDigit(prefix[0]) && isDigit(prefix[1]) && prefix[0] != '0') {
string suffix = s.substr(2);
if (suffix.size() != 10) {
cout << "Invalid" << "\n";
} else {
bool ok = true;
for (int i = 0; i < 10; i++) {
if (!isDigit(suffix[i])) {
ok = false;
}
}
if (ok) {
cout << "E-commerce" << "\n";
} else {
cout << "Invalid" << "\n";
}
}
} else {
cout << "Invalid" << "\n";
}
}
}
int main() {
int t;
cin >> t;
while (t--) {
solve();
}
}
Java:[此代码未进行大量数据的测试,仅供参考]
import java.util.Scanner;
public class Main {
public static boolean isUpperCase(char c) {
return c >= 'A' && c <= 'Z';
}
public static boolean isLowerCase(char c) {
return c >= 'a' && c <= 'z';
}
public static boolean isDigit(char c) {
return c >= '0' && c <= '9';
}
public static void solve(Scanner sc) {
String s = sc.next();
if (s.length() < 2) {
System.out.println("Invalid");
return;
}
String prefix = s.substring(0, 2);
String suffix = s.substring(2);
if (prefix.equals("SF")) {
if (suffix.length() != 10) {
System.out.println("Invalid");
} else {
boolean ok = suffix.chars().allMatch(Character::isDigit);
System.out.println(ok ? "Normal" : "Invalid");
}
} else if (prefix.equals("EX")) {
if (suffix.length() != 10) {
System.out.println("Invalid");
} else {
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