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Problem 1 - C++ :

```#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define rep(i, l, r) for ((i) = (l); (i) <=(r); (i)++)
#define rep1(i, r, l) for ((i) = (r); (i) >=(l); (i)--)

int main()
{

ios_base::sync_with_stdio(false) ;
cin.tie(NULL);
cout.tie(NULL);
ll t ;
cin>>t; ll i1=1;
while(t--)
{
ll n,m ;
cin>>n>>m ;
char r[2*n+5][2*m+8];ll i ; ll j ;
char ok = '+';char rr='|';
rep(i,1,2*n+1){

rep(j,1,2*m+1){
if(i%2!=0){

if(j%2==0){
ok='-';
}
else
{
ok='+';
}
r[i][j] = ok ;
}
else
{

if(j%2==0){
rr='.';
}
else
{
rr='|';
}
r[i][j] = rr;
}
}
}
r[1][1]='.';
r[1][2]='.';
r[2][1]='.';
r[2][2]='.';
cout<<"Case ";
cout<<"#";cout<<i1;
cout<<": ";i1++;
cout<< "\n";
rep(i,1,2*n+1){

rep(j,1,2*m+1){
cout<<r[i][j];
}

cout<<"\n";
}
}
return 0 ;
}

/*
1)First think of the complete solution , then think of how to write it in short , then code.
2)Always spend few minutes thinking if you can directly solve the full task rather than only the small subtasks.
3)100% calm , use the scoreboard of other divisions or look at none of them.
4)..
5)..
*/```
by Expert (111,330 points)