1122. Game

http://acm.timus.ru/problem.aspx?space=1&num=1122

简单搜索 

难题练思维  水题练细心  我的细心还不够呀 一个小地方写错了 一直过不了 真想杀了自己 以后要多注意呀

代码：

#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<vector>
#include<queue>
#include<map>
#include<stack>
#include<algorithm>
#include<cmath>

using namespace std;
//#pragma comment(linker,"/STACK:1000000000,1000000000")

#define LL long long

const int INF=0x3f3f3f3f;
const int N=15;
int graph[N][N];
int turn[N];
int x[9]={-1,-1,-1,0,0,0,1,1,1};
int y[9]={-1,0,1,-1,0,1,-1,0,1};
int ans;
int Tturn(int i,int j,int k)
{
    for(int w=0;w<9;++w)
    {
        if(turn[w]==0)
        continue;
        int l1=i+x[w];
        int l2=j+y[w];
        if(l1>=1&&l1<=4&&l2>=1&&l2<=4)
        {
            if(graph[l1][l2])
            {--k;graph[l1][l2]=0;}
            else
            {++k;graph[l1][l2]=1;}
        }
    }
    return k;
}
void dfs(int i,int j,int k,int num)
{
    if(num>=ans)
    return ;
    if(i==5)
    {
        if(k==0||k==16)
        {
            if(num<ans)
            ans=num;
        }
        return ;
    }
    int l1,l2;
    if(j==4)
    {l1=i+1;l2=1;}
    else
    {l1=i;l2=j+1;}
    dfs(l1,l2,k,num);
    k=Tturn(i,j,k);
    dfs(l1,l2,k,num+1);
    Tturn(i,j,k);
}
int input()
{
    char c;
    int k=0;
    for(int i=1;i<=4;++i)
    for(int j=1;j<=4;++j)
    {
        cin>>c;
        if(c=='W')
        {graph[i][j]=1;++k;}
        else
        graph[i][j]=0;
    }
    for(int i=0;i<9;++i)
    {
        cin>>c;
        if(c=='1')
        turn[i]=1;
        else
        turn[i]=0;
    }
    return k;
}
int main()
{
    //freopen("data.txt","r",stdin);
    int k=input();
    ans=INF;
    dfs(1,1,k,0);
    if(ans==INF)
    printf("Impossible\n");
    else
    printf("%d\n",ans);
    return 0;
}