2015 CCPC H문제【DFS】

#include <cstdio>
#include <cstring>
#include <cmath>
#include <cstdlib>
#include <algorithm>
#include <map>
#include <string>
#include <vector>
#define lson o<<1|1, l, mid
#define rson o<<1, mid+1, r
#define ll o<<1
#define rr o<<1|1
#define INF 0x3f3f3f3f
#define eps 1e-8
#define debug printf("1
")
#define MAXN 10000
#define MAXM 100000
#define LL long long
#define CLE(a, b) memset(a, (b), sizeof(a))
#define W(a) while(a--)
#define Ri(a) scanf("%d", &a)
#define Pi(a) printf("%d
", (a))
#define Rl(a) scanf("%lld", &a)
#define Pl(a) printf("%lld
", (a))
#define Ss(a) scanf("%s", a)
#define Ps(a) printf("%s
", a)
using namespace std;
int Map[5][5];
bool judge(int x, int y, int val)
{
    for(int i = 0; i < 4; i++)
        if(Map[x][i] == val)
            return false;
    for(int i = 0; i < 4; i++)
        if(Map[i][y] == val)
            return false;
    int row, cul;
    row = x / 2 * 2; cul = y / 2 * 2;
    for(int i = row; i < row+2; i++)
        for(int j = cul; j < cul+2; j++)
            if(Map[i][j] == val)
                return false;
    return true;
}
void DFS(int x, int y)
{
    if(x == 4)
    {
        for(int i = 0; i < 4; i++)
        {
            for(int j = 0; j < 4; j++)
                printf("%d", Map[i][j]);
            printf("
");
        }
    }
    else if(y == 4)
        DFS(x+1, 0);
    else if(Map[x][y])
        DFS(x, y+1);
    else
    {
        for(int i = 1; i <= 4; i++)
        {
            if(judge(x, y, i))
            {
                Map[x][y] = i;
                DFS(x, y+1);
                Map[x][y] = 0;
            }
        }
    }
}
char str[5];
int main()
{
    int t, kcase = 1;
    scanf("%d", &t);
    W(t)
    {
        getchar();
        for(int i = 0; i < 4; i++)
        {
            Ss(str);
            for(int j = 0; j < 4; j++)
            {
                if(str[j] == '*')
                    Map[i][j] = 0;
                else
                    Map[i][j] = str[j] - '0';
            }
        }
        printf("Case #%d:
", kcase++);
        DFS(0, 0);
    }
    return 0;
}