Topcoder SRM 514(Div.2) report

I can solve only 250-problem.

250:I solve this as practice of C++. Now, I study C++. I spend a lot of time to compile and testing, however,  solve at the score is 191.66.

500:I think using BFS, however, it's not good. I spent time to think, and I can't solve. After the contest, I see rng_58's source and chokudai's source. It's very simple!

Result:191.66,436/996.

<250>

#include<cstdio>

#include<cstdlib>

#include<cstring>

#include<cmath>

class MagicalGirlLevelOneDivTwo{

public:

double theMinDistance(int d, int x, int y);

};

double MagicalGirlLevelOneDivTwo::theMinDistance(int d, int x, int y){

x=abs(x);

y=abs(y);

x-=d;

y-=d;

if(x<=0) x=0;

if(y<=0) y=0;

double r;

r=sqrt((double)x*x+(double)y*y);

return r;

}