net-force.nl/programming writeup

　　从 wechall.net 到 net-force.nl 网站，发现网站的内容不错，里面也有不同类型的挑战题目：Javascript / Java Applets / Cryptography / Exploits / Cracking / Programming / Internet / Steganography，有的还有一定的难度。注册了帐号做题，我也从中学到了不少知识。对网络攻防有兴趣的同学可以尝试下。

 

level 601: Keep walking... 
/*
This is a challenge to test your basic programming skills.

Pseudo code:
Set X = 1
Set Y = 1
Set previous answer = 1

answer = X * Y + previous answer + 3

After that => X + 1 and Y + 1 ('answer' becomes 'previous answer') and repeat this till you have X = 525.

The final answer is the value of 'answer' when X = 525. Fill it in below to check if it's the correct answer. If it is, you will get the password for the challenge page.
*/
　　第一题是热身题，直接按照题目所说的写代码就行了。

#include <stdio.h>
 
int main()
{
    int answer = 1;
    for(int x = 1, y = 1; x<=525; ++x, ++y)
        answer += (x*y + 3);
    printf("answer: %d\n", answer);
 
    return 0;
}

answer