D. Corrupted Array

找一个x，让它分为sum*2

找到sum

好了

const int N=2e5+7;
int n,a[N];
map<int,int>mp;
void solve(){
    mp.clear();
    cin>>n;int sum=0;
    for(int i=1;i<=n+2;++i){
        cin>>a[i];
        sum+=a[i];
        mp[a[i]]++;
    }
    int flag=0;
    for(int i=1;i<=n+2;++i){
        int now=sum-a[i];
        if(now&1)    continue;
        if(mp[now>>1]>0){
            if(a[i]==(now>>1)&&mp[a[i]]==1)    continue;//相同情况 不唯一 
            int f=0,ff=0;
            for(int j=1;j<=n+2;++j){
                if(a[j]==(now>>1)&&f==0){
                    f=1;continue;
                }
                if(a[j]==a[i]&&ff==0){
                    ff=1;continue;
                }
                cout<<a[j]<<" ";
            }
            flag=1;
            break;
        }
    }
    if(!flag){
        cout<<"-1
";
        return ;
    } 
    cout<<"
";
}