#include <bits/stdc++.h>
#include "coins.h"
using namespace std;
#define fi first
#define se second
#define all(a) a.begin(),a.end()
#define pb push_back
const int maxn = 2e5+1;
vector <int> coin_flips(vector <int> b, int c){
vector <int> d;
vector <int> bin(8, 0);
int cnt = 0;
while(c > 0){
if(c %2 == 1){
bin[cnt] = 1;
}
cnt++;
c/=2;
}
for(int i = 0;i < 8;i++){
if(b[i] == 0 && bin[i] == 1)d.push_back(i);
else if(b[i] == 1 && bin[i] == 0)d.push_back(i);
}
return d;
}
int find_coin(vector <int> b){
int ans = 0;
for(int i = 0;i < 8;i++){
if(b[i] == 1)
ans += (1<<i);
}
return ans;
}
// static string run_test() {
// int c;
// cin >> c;
// vector<int> b(64);
// for (int i = 0; i < 8; i++) {
// string s;
// cin >> s;
// for (int j = 0; j < 8; j++) {
// b[i * 8 + j] = int(s[j] - '0');
// }
// }
// vector<int> flips = coin_flips(b, c);
// if ((int)flips.size() == 0) {
// return "0 turn overs";
// }
// for (int i = 0; i < (int)flips.size(); i++) {
// if (flips[i] < 0 || flips[i] > 63) {
// return "cell number out of range";
// }
// b[flips[i]] = 1 - b[flips[i]];
// }
// int coin = find_coin(b);
// if (coin != c) {
// cout<<coin<<' ';
// return "wrong coin";
// }
// return "ok";
// }
// signed main() {
// int tests;
// cin >> tests;
// for (int t = 1; t <= tests; t++) {
// string result = run_test();
// cout << "test #" << t << ": " << result << endl;
// }
// return 0;
// }
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