可能会计算错存在留级、转学、退学、bs等情况的同学或班级，请谅解。（例如：25届10班5号和之后的学号）

Dev-c++上开启 -std=c++11 可用。

#include<set>
#include<stdio.h>
#include<algorithm>
#include<conio.h>
#include<windows.h>
using namespace std;

int a[10][15] = {
{3, 123, 164, 205, 246},
{12, 2, 42, 82, 579, 620, 661, 702, 744, 786, 827, 868, 910, 951},
{12, 1152, 1189, 1224, 1261, 1303, 1345, 1388, 1431, 1473, 1514, 1557, 1599, 1641}
};
int mode = 0;

char getlimitch(initializer_list<char> sig){
	set<char>s;
	for (char c : sig) s.insert(c);
	char ch = getch();
	while (!s.count(ch)) ch = getch();
	return ch;
}
void links(int uid){
	string s = "";
	while (uid){
		s = (char)(uid % 10 + '0') + s;
		uid /= 10; 
	}
	puts("");
	puts(("主页链接（内网）：http://10.80.74.11/user/" + s).c_str());
	puts(("主页链接（外网）：http://hfoj.net/user/" + s).c_str());
	puts(("主页链接（Markdown）：[主页链接](/user/" + s + ")").c_str());
	puts(("博客链接（内网）：http://10.80.74.11/blog/" + s).c_str());
	puts(("博客链接（外网）：http://hfoj.net/blog/" + s).c_str());
	puts(("博客链接（Markdown）：[博客链接](/blog/" + s + ")").c_str());
}

void f();
void g();
void h();

void f(){
	system("cls");
	puts ("按 1 UID 转学号\n按 2 学号转 UID\n按 esc 退出");
	char ch = getlimitch({'1', '2', (char)27});
	if (ch == '1')
		mode = 1;
	else if (ch == '2')
		mode = 2;
	else
		exit(0);
}
void g(){
	system("cls");
	printf ("请输入 UID：");
	int uid;
	scanf ("%d", &uid);
	if (uid == 87) puts("\n喵喵喵\n");
	if (uid <= 0) puts("找不到用户");
	else {
		if (uid == 1) puts("您是Hydro管理员");
		else if (uid == 2) puts("您是梁老师");
		else if (uid == 123) puts("您是徐老师");
		else if (uid == 247) puts("您是tokawah");
		else {
			bool f = 1;
			for (int i = 0;i < 3 && f;++i)
				for (int j = 1;j <= a[i][0] && f;++j)
					if (a[i][j] < uid && uid <= a[i][j + 1]){
						if (i == 1 && j == 3 && uid - a[i][j] > 40) continue;
						f = 0;
						printf ("您是 %d 届 %d 班 %d 号，%04d\n", 24 + i, j, uid - a[i][j], j * 100 + uid - a[i][j]);
					}
			if (f)
				puts("您是自创用户/找不到用户");
		}
		links(uid);
	}
	puts("");
	puts("按任意键继续");
	char ch = getch();
	mode = 0;
}
void h(){
	system("cls");
	printf ("请输入年级（期望毕业时所在年份-2000）：");
	int gd;
	scanf ("%d", &gd);
	gd -= 24;
	if (gd < 0 || gd >= 3) puts ("暂无该年级数据");
	else {
		printf ("请输入班级：");
		int cl;
		scanf ("%d", &cl);
		if (cl <= 0 || cl > a[gd][0]) puts ("暂无该班级数据");
		else {
			printf ("请输入学号：");
			int id, uid;
			scanf ("%d", &id);
			if (id <= 0 || id > a[gd][cl+1] - a[gd][cl] || (gd == 1 && cl == 3 && id > 40)) puts ("暂无该学号数据");
			else {
				uid = a[gd][cl] + id;
				if (uid == 87) puts("\n喵喵喵\n");
				printf ("您的 UID 可能是：%d\n", uid);
				links(uid);
			}
		}
	}
	puts("");
	puts("按任意键继续");
	char ch = getch();
	mode = 0;
}
int main(){
	while (true){
		if (mode == 0) f();
		if (mode == 1) g();
		if (mode == 2) h();
	}
	return 0;
}