F. Flamingoes of Mystery · znzryb

## AC代码

比较简单的交互题

```cpp
#include <iostream>
#include <cstring>
#include <algorithm>
#include <deque>
#include <queue>
#include <vector>
#include <set>
#include <map>
#include <cmath>
#include <bitset>
#include <iterator>
#include <random>
#include <iomanip>

using namespace std;
typedef long long ll;
const ll N= 1010;
ll n,sum[N],ans[N];

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    cin>>n;
    for(int i=1;i<=n-1;++i) {
        cout<<"? 1 "<<n-i+1<<endl;
        cin>>sum[n-i+1];
    }
    cout<<"? 2 3"<<endl;
    ll temp;
    cin>>temp;
    for(int i=n;i>=3;--i) {
        ans[i]=sum[i]-sum[i-1];
    }
    ans[1]=sum[3]-temp;
    ans[2]=sum[2]-ans[1];
    cout<<"! ";
    for(int i=1;i<=n;++i) {
        cout<<ans[i]<<" ";
    }
    cout<<endl;
}
// AC https://codeforces.com/problemset/submission/1425/291200157
```

## 心路历程（WA，TLE，MLE……）