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- #include <bits/stdc++.h>
- using namespace std;
- #define max 100000000
- long long vet[max];
- int main()
- {
- long long i,j,n,aux;
- scanf("%llu",&n);
- while(n!=0){
- memset(vet,0,n*sizeof(long long unsigned));
- for(i=0;i<n;i++){
- scanf("%llu",&aux);
- if(vet[aux]%2==0) // achou par re-inicializa
- vet[aux]=0;
- vet[aux]+=1;
- }
- for(i=0;i<n;i++){
- if(vet[i]==1){
- //cout<<i<<'\n';
- printf("%llu\n",i);
- break;
- }
- }
- scanf("%llu",&n);
- }
- return 0;
- }
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