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Cod sursa(job #377339)
#include <fstream>
#include <set>
using namespace std;
const long int MaxN=200002;
const char InFile[]="heapuri.in";
const char OutFile[]="heapuri.out";
set<int> h;
int n,ord_ind=1,x,c,ord[MaxN];
int main(){
ifstream fin(InFile);
ofstream fout(OutFile);
fin>>n;
for(register int i=0;i<n;++i){
fin>>c;
if(c<3){
fin>>x;
}
if(c==1){
h.insert(x);
ord[ord_ind]=x;
ord_ind++;
}else if(c==2){
h.erase(ord[x]);
}else if(c==3){
fout<<*h.begin()<<"\n";
}
}
fin.close();
fout.close();
return 0;
}