#include "coins.h"
#include <bits/stdc++.h>
using namespace std; using ii = pair<int,int>; using ll = long long; using vi = vector<int>;
#define rep(i,a,b) for (auto i = (a); i <= (b); ++i)
#define per(i,a,b) for (auto i = (b); i >= (a); --i)
#define all(x) begin(x), end(x)
#define siz(x) int((x).size())
#define Mup(x,y) x = max(x,y)
#define mup(x,y) x = min(x,y)
#define fi first
#define se second
#define dbg(...) fprintf(stderr,__VA_ARGS__)
vi coin_flips(vi b, int c) {
vi flips;
rep(i,0,siz(b)-1) {
if (b[i] ^ (i == c)) {
flips.push_back(i);
}
}
if (empty(flips)) {
flips.push_back(1);
flips.push_back(1);
}
return b;
}
int find_coin(vi b) {
rep(i,0,siz(b)-1) {
if (b[i]) return i;
}
assert(0);
}
