ARC104 A-Plus Minus (Simple Mathematics)

Title:

solution:

x+y=a
x-y=b

两式相加得:
x+y+x-y=a+b
x*2=a+b
x=(a+b)/2.

x求出来之后,y=a-x.

code：

#include<bits/stdc++.h>
#define int long long
using namespace std;

void solve(){
    
    
    int a,b;cin>>a>>b;
    int x=(a+b)/2;
    int y=a-x;
    cout<<x<<' '<<y<<endl;
}
signed main(){
    
    
    ios::sync_with_stdio(0);
    solve();
    return 0;
}

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