Submission #56532089

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#include<bits/stdc++.h>
using namespace std;
#define int long long
void solve(){
    int q;cin>>q;
    map<int,int>mp;
    while(q--){
        int op,x;cin>>op;
        if(op==1){
            cin>>x;
            mp[x]++;
        }else if(op==2){
            cin>>x;
            mp[x]--;
            if(mp[x]==0){
                mp.erase(x);
            }
        }else{
            cout<<mp.size()<<'\n';
        }
 
 
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#include<bits/stdc++.h>
using namespace std;
#define int long long

void solve(){
    int q;cin>>q;
    map<int,int>mp;
    while(q--){
        int op,x;cin>>op;
        if(op==1){
            cin>>x;
            mp[x]++;
        }else if(op==2){
            cin>>x;
            mp[x]--;
            if(mp[x]==0){
                mp.erase(x);
            }
        }else{
            cout<<mp.size()<<'\n';
        }
    }
}
signed main(){
    ios::sync_with_stdio(0);cin.tie(0),cout.tie(0);
    // int t;cin>>t;while(t--)
    solve();
}

Submission Info

Judge Result