# UVA 10812 Beat the Spread!
## 題目連結 [UVA 10812](https://vjudge.net/problem/UVA-10812)
### 題目內容
Superbowl Sunday is nearly here. In order to pass the time waiting for the half-time commercials and wardrobe malfunctions, the local hackers have organized a betting pool on the game. Members place their bets on the sum of the two final scores, or on the absolute difference between the two scores.
Given the winning numbers for each type of bet, can you deduce the final scores?
### 輸入限制
The first line of input contains n, the number of test cases. n lines follow, each representing a test case. Each test case gives s and d, non-negative integers representing the sum and (absolute) difference between the two final scores.
### 輸出限制
For each test case, output a line giving the two final scores, largest first. If there are no such scores, output a line containing “impossible”. Recall that football scores are always non-negative integers.
### 解題思路
1.a為大數，b為小數
2.判斷依據有兩個，s+d是否為奇數、b是否小於0
### 程式碼

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    while(n--){
        int s,d;
        cin>>s>>d;
        int a=(s+d)/2;
        int b=s-a;
        if((s+d)&1){
            cout<<"impossible"<<endl;
        }
        else if(b<0){
            cout<<"impossible"<<endl;
        }
        else{
            cout<<a<<" "<<b<<endl;
        }
    }
}

## 測資
### Sample input
2
40 20
20 40
### Sample output
30 10
impossible
## 中文題目連結 [zerojudge c004](https://zerojudge.tw/ShowProblem?problemid=c004)