Create 1010_csdn.cpp

From http://blog.csdn.net/hurmishine/article/details/51255092

HDOJ/1010_csdn.cpp

@@ -0,0 +1,73 @@
+#include <iostream>
+#include <cstring>
+using namespace std;
+char a[10][10];
+int n,m,t;
+int sx,sy,ex,ey;
+bool flag;
+int dir[4][2]={0,1,1,0,0,-1,-1,0};
+int abs(int x)
+{
+    return x<0?-x:x;
+}
+void DFS(int x,int y,int time)//当前位置坐标(x,y),到目前位置消耗时间
+{
+    if(x<0||x>=n||y<0||y>=m)
+        return;
+    if(x==ex&&y==ey&&time==t)
+    {
+        flag =true;
+        return ;
+    }
+    if(flag)
+        return;
+    int temp=(t-time)-(abs(x-ex)+abs(y-ey));
+    if(temp<0||temp&1)
+        return;
+    for(int i=0;i<4;i++)
+    {
+        int xx=x+dir[i][0];
+        int yy=y+dir[i][1];
+        if(a[xx][yy]!='X')
+        {
+            a[xx][yy]='X';
+            DFS(xx,yy,time+1);
+            a[xx][yy]='.';
+            if(flag)
+                return ;
+        }
+    }
+}
+int main()
+{
+    while(cin>>n>>m>>t)
+    {
+        if(n==0&&m==0)
+            break;
+        int wall=0;
+        for(int i=0; i<n; i++)
+            for(int j=0; j<m; j++)
+            {
+                cin>>a[i][j];
+                if(a[i][j]=='S')
+                    sx=i,sy=j;
+                else if(a[i][j]=='D')
+                    ex=i,ey=j;
+                else if(a[i][j]=='X')
+                    wall++;
+            }
+        if(n*m-wall<=t)
+        {
+            cout<<"NO"<<endl;
+            continue;
+        }
+        flag=false;
+        a[sx][sy]='X';
+        DFS(sx,sy,0);
+        if(flag)
+            cout<<"YES"<<endl;
+        else
+            cout<<"NO"<<endl;
+    }
+    return 0;
+}