Submission #1262323

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

#define FOR(i,a,b) for (int i = (a); i < (b); i++)
#define RFOR(i,b,a) for (int i = (b)-1; i >= (a); i--)
#define ITER(it,a) for (__typeof(a.begin()) it = a.begin(); it != a.end(); it++)
#define FILL(a,value) memset(a, value, sizeof(a))

#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;

const double PI = acos(-1.0);
const int INF = 1000 * 1000 * 1000 + 7;
const LL LINF = INF * (LL) INF;


int main()
{
	//freopen("in.txt", "r", stdin);
	//ios::sync_with_stdio(false); cin.tie(0);

	int a, b, c;
	cin>>a>>b>>c;
	set<pair<int, PII> > S;

	int res = 0;

	while(true)
	{
		if (S.count(MP(a, MP(b, c))))
		{
			cout<<-1<<endl;
			return 0;
		}

		S.insert(MP(a, MP(b, c)));

		if(a & 1) break;
		if(b & 1) break;
		if(c & 1) break;

		int A = b / 2 + c / 2;
		int B = a / 2 + c / 2;
		int C = a / b + b / 2;

		a = A;
		b = B;
		c = C;
		res++;
	}

	cout<<res<<endl;


}

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