OpenJ_Bailian - 2488

#include
#include
#include
#include
#include
#include
const int maxn = 100;
using namespace std;

int n,a,b,flag;
int vis[maxn][maxn];
int dx[] = {-1,1,-2,2,-2,2,-1,1};
int dy[] = {-2,-2,-1,-1,1,1,2,2};

struct node{
    int c;
    int r;
}e[1000];

void solve(int x,int y,int cnt){
    for(int i = 0 ; i < 8 ; i++){
        int xx = dx[i] + x;
        int yy = dy[i] + y;
        if(xx < 0 || xx >= a || yy < 0 || yy >= b || vis[xx][yy] ||flag)   continue;
        vis[xx][yy] = 1;
        e[cnt].c = xx;
        e[cnt].r = yy;
        solve(xx,yy,cnt+1);
        vis[xx][yy] = 0;
    }
    if(cnt == a*b){
        flag = 1;
        return;
    }
}

int main(){
    scanf("%d",&n);
    for(int i = 0 ; i < n ; i++){
        memset(e,0,sizeof(e));
        memset(vis,0,sizeof(vis));
        flag = 0;
        e[1].c = 0;
        e[1].r = 0;
        vis[0][0] = 1;
        scanf("%d%d",&a,&b);
        solve(0,0,1);
        printf("Scenario #%d:\n",i + 1);
        if(flag){
            for(int j = 0 ; j < a*b ; j++)
                printf("%c%d",e[j].r + 65,e[j].c + 1);
            printf("\n");
        }
        else printf("impossible\n");
        printf("\n");
    }
    return 0;
}