邀请码：55i6

提示：这些题目含有 Codeforces 的某些特性，建议按分值升序开题。

Additional Pastes:

• (6pn5z8ev) A. Who's the father of Codeforces? (the answer includes a space)
• (qx1hvghm) B. When did Codeforces Beta Round 1 start? (in UTC+8, print like Aug/31/2023 01:30)
• (qrzfp7eu) C. What's the official mirror site of Codeforces? (print like m1.codeforces.com)
• (jbb3plg6) D. What's the topic of the first sidebar in the HOME page? (the answer includes a space and a capital English letter)
• (qor2acpy) E. What's the largest prime under 10^4 ?
• (bdu9b31a) F. What's the root of the equation \varphi(n)=2n-16 ?
• (95d92fz6) G. Tell me what's your favourite! (the answer is a string of length 8 and includes a capital English letter)

答案

Problem A

直接回答。大小写不敏感。

NO
NO
NO

Problem B

试一试即可。注意到题目中说可能有前导 0，不难猜到真的有。

035966

Problem C

这是 CF954A 的 AC Code。

954

Problem D

原题显然是 CF4A - Watermelon。

watermelon

Problem E

不难猜到密码是 codeforces。输出对应字符即可。

#include<bits/stdc++.h>
using namespace std;
string s=" codeforces";
int main()
{
    int h;
    cin>>h;
    cout<<s[h];
    return 0;
}

Problem F

注意到标题是 Validator，所以要判断数据合不合法。

大小写不敏感。输出 Valid/Invalid 或 Yes/No 都可以。

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int h;
    cin>>h;
    if(h<=10) cout<<"yes";
    else cout<<"no";
    return 0;
}

Problem G

注意到标签是「排序」，排序即可。

#include<bits/stdc++.h>
using namespace std;
char s[100012];
int main()
{
    for(int i=1;i<=100000;i++)
        cin>>s[i];
    sort(s+1,s+100001);
    for(int i=1;i<=100000;i++)
        cout<<s[i];
    return 0;
}

Problem H

注意到 8 个题目背景都有白字。排成 8 行，提取前 7 列，就可以得到上面 7 个 Additional Pastes。依次回答 7 个 Additional Pastes 中的问题即可。注意，输入是大写字母，不是数字。

#include<bits/stdc++.h>
using namespace std;
const string s[8]=
{
"",
"Mike Mirzayanov",
"Feb/19/2010 20:00",
"mirror.codeforces.com",
"Pay attention",
"9973",
"10",
"Accepted"
};
int main()
{
    char c;
    cin>>c;
    int x=c-64;
    cout<<s[x];
    return 0;
}