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Cod sursa(job #730040)
#include <fstream>
#include <vector>
using namespace std;
int n;
vector <int> M;
vector <int>::iterator it;
vector<int>::iterator findValue(int x){
for(it = M.begin(); it != M.end(); it++)
if(*it == x)
return it;
return M.end();
}
void insert(int x){
if(findValue(x) == M.end())
M.push_back(x);
}
void erase(int x){
it = findValue(x);
if (it != M.end())
G.erase(it);
}
int main(){
int tipOp,x;
ifstream f("hashuri.in");
ofstream g("hashuri.out");
f>>n;
for(int i = 1; i <= n; i++){
f>>tipOp>>x;
if(tipOp == 1){
insert(x);
continue;
}
if(tipOp == 2){
erase(x);
continue;
}
g<<(findValue(x)!= M.end());
}
f.close();
g.close();
return 0;
}