From 31fd7e7d3f2e95736ad30d5bd9e01d61d0cc1775 Mon Sep 17 00:00:00 2001
From: Kirito <1362050620@qq.com>
Date: Tue, 4 Oct 2016 18:35:29 +0800
Subject: [PATCH] Create 52307_keyboarderqq.cpp

From http://blog.csdn.net/keyboarderqq/article/details/52730750
---
 BNUOJ/52307_keyboarderqq.cpp | 109 +++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 BNUOJ/52307_keyboarderqq.cpp

diff --git a/BNUOJ/52307_keyboarderqq.cpp b/BNUOJ/52307_keyboarderqq.cpp
new file mode 100644
index 0000000..1cd08d9
--- /dev/null
+++ b/BNUOJ/52307_keyboarderqq.cpp
@@ -0,0 +1,109 @@
+#include <bits/stdc++.h>
+using namespace std;
+typedef long long LL;
+
+const int N=2e2+10;
+
+struct asd{
+    int x,y;
+};
+int dx[4]={0,0,-1,1};
+int dy[4]={1,-1,0,0};
+char s[N][N];
+int step[N][N];
+int n,m;
+int sx,sy;
+queue<asd>q;
+
+void init()
+{
+    while(!q.empty())
+        q.pop();
+    memset(step,-1,sizeof(step));
+}
+
+bool Judge(int x,int y)
+{
+    if(x<0||y<0||x>=n||y>=m)
+        return 0;
+    if(s[x][y]=='#')
+        return 0;
+    return 1;
+}
+
+void bfs()
+{
+    init();
+    asd now,next;
+    now.x=sx;
+    now.y=sy;
+    step[now.x][now.y]=0;
+    q.push(now);
+    while(!q.empty())
+    {
+        now=q.front();
+        q.pop();
+//        printf("%d %d\n",now.x,now.y);
+        for(int i=0;i<4;i++)
+        {
+            int x=now.x+dx[i];
+            int y=now.y+dy[i];
+            if(Judge(x,y))
+            {
+                if(step[x][y]==-1)
+                {
+                    step[x][y]=step[now.x][now.y]+1;
+                    next.x=x;
+                    next.y=y;
+                    q.push(next);
+                }
+            }
+        }
+    }
+    int temp1;
+    int temp2=0x3f3f3f3f;
+    for(int i=0;i<n;i++)
+    {
+        for(int j=0;j<m;j++)
+        {
+            if(s[i][j]=='@')
+            {
+                temp1=step[i][j];
+            }
+            if(s[i][j]=='$'&&step[i][j]!=-1)
+            {
+                temp2=min(temp2,step[i][j]);
+            }
+        }
+    }
+    if(temp1<temp2)
+        puts("Yes");
+    else
+        puts("No");
+}
+
+int main()
+{
+    scanf("%d%d",&n,&m);
+    for(int i=0;i<n;i++)
+        scanf("%s",s[i]);
+    int f=0;
+
+    for(int i=0;i<n;i++)
+    {
+        for(int j=0;j<m;j++)
+        {
+            if(s[i][j]=='%')
+            {
+                sx=i;
+                sy=j;
+                f=1;
+                break;
+            }
+        }
+        if(f)
+            break;
+    }
+    bfs();
+    return 0;
+}