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I don't know why......need biginteger

[cpp]#include <iostream>
#include <fstream>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <cstdio>
#include <cassert>

using namespace std;

#ifdef ONLINE_JUDGE
istream& in = cin;
#else
ifstream in("test.in");
#endif

void calc(double ySq ...