#include "doll.h"
#include <bits/stdc++.h>
using namespace std;
void create_circuit(int M, std::vector<int> A) {
int N = A.size();
vector<int> C(M + 1);
vector<int> X(N); vector<int>Y(N);
int prevC = 0;
map<int, int> times;
int counter = 0;
for(int i = 0; i < N; i++){
int valueToGoTo = A[i];
times[valueToGoTo]++;
if(times[valueToGoTo] == 2){
X[counter] = C[valueToGoTo];
Y[counter] = valueToGoTo;
counter++;
C[valueToGoTo] = -counter;
}else{
C[prevC] = A[i];
prevC = C[prevC];
}
}
answer(C, X, Y);
}
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