题解 | #翻转翻转#

#include<iostream>
#include<climits>
#include<vector>
#include<algorithm>
#include<numeric>
#include <string>
using namespace std;



int main(){
    int T;
    cin>>T;
    long long m,n;
    while(T--){
        cin>>m>>n;
        if(m==1||n==1){
            int big=max(m,n);
            if(big==1) cout<<1<<endl;
            else if(big>=2){
                cout<<big-2<<endl;
            }
        }else{
            cout<<(m-2)*(n-2)<<endl;
        }
    }



    system("pause");
    return 0;
}