P1074 靶形数独（TLE 75）

题目

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<string>
#include<cmath>
#define LL long long
using namespace std;
int lief[10][10],hangf[10][10],gef[10][10];
int quan[10][10]=
{
  0,0,0,0,0,0,0,0,0,0,
  0,6,6,6,6,6,6,6,6,6,
  0,6,7,7,7,7,7,7,7,6,
  0,6,7,8,8,8,8,8,7,6,
  0,6,7,8,9,9,9,8,7,6,
  0,6,7,8,9,10,9,8,7,6,
  0,6,7,8,9,9,9,8,7,6,
  0,6,7,8,8,8,8,8,7,6,
  0,6,7,7,7,7,7,7,7,6,
  0,6,6,6,6,6,6,6,6,6,
};
int ge[10][10]=
{
  0,0,0,0,0,0,0,0,0,0,
  0,1,1,1,2,2,2,3,3,3,
  0,1,1,1,2,2,2,3,3,3,
  0,1,1,1,2,2,2,3,3,3,
  0,4,4,4,5,5,5,6,6,6,
  0,4,4,4,5,5,5,6,6,6,
  0,4,4,4,5,5,5,6,6,6,
  0,7,7,7,8,8,8,9,9,9,
  0,7,7,7,8,8,8,9,9,9,
  0,7,7,7,8,8,8,9,9,9,
};
int a[10][10];
int sum=0,sum2;
void dfs(int x,int y,int tot)
{
    if(x==10&&y==1){
        sum=max(sum,tot);
        return;
    }
    if(a[x][y]){
        if(y<9) dfs(x,y+1,tot);
        else dfs(x+1,1,tot);
    }
    else{
        for(int i=1;i<=9;i++){
            if( !lief[y][i] && !hangf[x][i]&& !gef[ge[x][y]][i]) {
            lief[y][i]=1,hangf[x][i]=1,gef[ge[x][y]][i]=1,a[x][y]=i;
            if(y<9) dfs(x,y+1,tot+i*quan[x][y]);
            else    dfs(x+1,1,tot+i*quan[x][y]);
            lief[y][i]=0,hangf[x][i]=0,gef[ge[x][y]][i]=0,a[x][y]=0;
            }

        }

    }
}
int main()
{
    for(int i=1;i<=9;i++)
     for(int j=1;j<=9;j++){
        scanf("%d",&a[i][j]);
        sum+=quan[i][j]*a[i][j];
        lief[j][a[i][j]]=1;
        hangf[i][a[i][j]]=1;
        gef[ge[i][j]][a[i][j]]=1;
     }
    sum2=sum;
    dfs(1,1,sum);
    if(sum2==sum) printf("-1");
    else 
    printf("%d",sum);
    return 0;  
}