#include "coins.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<ll> vi;
typedef pair<ll,ll> pi;
typedef pair<ll, pi> pii;
typedef set<ll> si;
typedef vector<pi> vpi;
typedef double dl;
#define mp make_pair
#define pb push_back
#define f first
#define s second
ll MOD = 1e9+7;
#define lb lower_bound
#define ub upper_bound
#define INF 1000000000
#define SZ(x) x.size()
#define ALL(x) x.begin(),x.end()
std::vector<int> coin_flips(std::vector<int> b, int c) {
int t = 0;
for (int i=0;i<64;++i){
if (b[i])t = t^i;
}
t = t^c;
vector<int> V;
V.pb(t);
return V;
}
int find_coin(std::vector<int> b) {
int t = 0;
for (int i=0;i<64;++i){
if (b[i])t = t^i;
}
return t;
}
