POJ2488

// poj2488.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <iostream>
using namespace std;

int map[10][10];
int labelX[16];
char labelY[16];
int bonus[16] = {-1,-2,1,-2,-2,-1,2,-1,-2,1,2,1,-1,2,1,2};
int n,col,row;

bool dfs(int x, int y, int totalStep){
int newX, newY;

if(totalStep ==  col*row-1){
labelX[totalStep] = x + 1;
labelY[totalStep] = y + 'A';
return true;
}

for(int i=0; i<16; i+=2){
newX = x + bonus[i];
newY = y + bonus[i+1];
if(newX >= 0 && newY >= 0 && newX < col && newY < row && !map[newX][newY]){
map[newX][newY] = 1;
labelX[totalStep] = x + 1;
labelY[totalStep] = y + 'A';
if(dfs(newX,newY,totalStep+1)) return true;
map[newX][newY] = 0;
}
}
return false;
}

void print(){
for(int i=0; i<col*row;  i++){
cout << labelY[i] << labelX[i];
}
cout << "\n";
}

int main()
{
cin >> n;

for(int i=1; i<=n; i++){
cin >> col;
cin >> row;
printf("Scenario #%d:\n",i);
memset(map,0,sizeof(map));
map[0][0] = 1;
if(dfs(0,0,0)){
print();
}else{
cout << "impossible" << endl;
}
cout << "\n";
}
return 0;
}