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| #include<bits/stdc++.h> #define inf 2147283647 using namespace std; int main(){ int t; cin>>t; for(int i=1;i<=t;i++) { int a,b,x,y; cin>>a>>b>>x>>y; x+=1; y+=1; int s1=(y-1)*a; int s2=(b-y)*a; int s3=(x-1)*b; int s4=(a-x)*b; cout<<max(max(max(s1,s2),s3),s4)<<endl; } return 0; }
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