SRM 500 Easy

#include<vector>
#include<memory.h>
using namespace std;

int buf[555];
class MafiaGame {
  public:
		double probabilityToLose(int N, vector <int> decisions)
		{
			int i, maxv = 0, cc, maxc = 0;
			
			double ret = 1.0;
			maxv=-1;

			for(i=0;i<decisions.size();i++) buf[decisions[i]]++;
			
			for(i=0;i<N;i++)
				if(buf[i] > maxv) maxv = buf[i], maxc=1;
				else if(buf[i]==maxv) maxc++;
			if(maxv < 2) return 0.0;

			if(maxc == 1) return 1.0;
			ret = 1.0 / maxc;
			cc = maxc;
			for(;;){
				if(cc == 1) return ret;
				if(N % cc == 0) return 0.0;
				cc = N % cc;
			}
		}
};