OJ Board

i have got WA several times
could anyone please give some tricky inputs or help me find bugs in my code?

#include <stdio.h>
#include <math.h>
#define MAXN 20
#define EPS 1E-10

int n ;
double x[MAXN], y[MAXN] ;

double findx(double y0) {
int i ;
int uid, did ;
double ori_dm, new_dm ;
double ...