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ticcontest2b.cpp
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ticcontest2b.cpp
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#include<iostream>
#include<cstring>
#include<string>
using namespace std;
int a[8][2];
int b[10000][2];
int tag[1000][1000];
string bb[1000][1000];
int sum,n,m;
void pp(int x,int y,int tot){
int k=0,i,x1,y1;
if(sum==1) return;
if(tot!=n*m+1){
for(i=0;i<=7;i++){
if(sum==1) return;
x1=x+a[i][0];y1=y+a[i][1];
if((x1>0)&&(y1>0)&&(x1<=n)&&(y1<=m))
if(tag[x1][y1]==0){
b[tot][0]=x1;
b[tot][1]=y1;
tag[x1][y1]=1;
pp(x1,y1,tot+1);
tag[x1][y1]=0;
}
}
}
else
sum=1;
}
int main(){
int i,j,k,t;
cin>>t;k=0;
a[0][0]=-1;a[0][1]=-2;
a[1][0]=1;a[1][1]=-2;
a[2][0]=-2;a[2][1]=-1;
a[3][0]=2;a[3][1]=-1;
a[4][0]=-2;a[4][1]=1;
a[5][0]=2;a[5][1]=1;
a[6][0]=-1;a[6][1]=2;
a[7][0]=1;a[7][1]=2;
bb[5][5]="A1B3A5C4A3B1D2E4C5A4B2D1C3B5D4E2C1A2B4D5E3C2E1D3E5";
bb[4][6]="A1B3C1A2B4C2D4E2F4D3E1F3D2B1A3C4B2A4C3E4F2D1E3F1";
bb[3][7]="A1B3D2F1G3E2G1F3E1G2E3C2A3B1C3A2C1D3B2D1F2";
bb[3][8]="A1B3C1A2C3D1B2D3E1G2E3C2A3B1D2F1H2F3G1E2G3H1F2H3";
bb[5][4]="A1B3A5C4D2B1A3B5D4C2B4A2C1D3C5A4B2D1C3D5";
bb[4][5]="A1B3C1A2B4D3E1C2D4E2C3A4B2D1E3C4A3B1D2E4";
bb[5][3]="impossible";
bb[3][4]="A1C2A3B1D2B3C1A2C3D1B2D3";
bb[4][3]="A1B3C1A2B4C2A3B1C3A4B2C4";
bb[4][4]="impossible";
bb[8][3]="A1B3C1A2B4C2A3B1C3A4B2C4A5B7C5A6B8C6A7B5C7A8B6C8";
bb[7][3]="A1B3C1A2C3B1A3C2B4A6C7B5A7C6A5B7C5A4B2C4B6";
bb[6][3]="impossible";
bb[6][4]="A1B3A5C6D4B5D6C4D2B1A3C2B4A2C1D3B2D1C3D5B6A4C5A6";
bb[3][5]="impossible";
bb[3][3]="impossible";
bb[4][4]="impossible";
bb[3][6]="impossible";
bb[1][1]="A1";
bb[3][2]="impossible";
bb[2][3]="impossible";
bb[3][3]="impossible";
while(t--){
k++;
cin>>n>>m;
if(n==2||m==2){
cout<<"Scenario #"<<k<<":"<<endl;
cout<<"impossible"<<endl;
continue;
}
if(n==1&&m!=1){
cout<<"Scenario #"<<k<<":"<<endl;
cout<<"impossible"<<endl;
}
if(bb[n][m]!=""){
cout<<"Scenario #"<<k<<":"<<endl;
cout<<bb[n][m]<<endl;
continue;}
memset(tag,0,sizeof(tag));
sum=0;
for(i=1;i<=m;i++){
for(j=1;j<=n;j++)
{
memset(tag,0,sizeof(tag));
tag[j][i]=1;
b[1][0]=j;
b[1][1]=i;
pp(j,i,2);
if(sum==1) break;
}
if(sum==1) break;
}
cout<<"Scenario #"<<k<<":"<<endl;
if(sum==0) cout<<"impossible"<<endl;
else
for(i=1;i<=n*m;i++)
cout<<char(b[i][1]+64)<<b[i][0];
}
}