68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
#include <iostream>
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#include <cstdio>
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#include <string.h>
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#include <cmath>
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#include <vector>
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#include <cstring>
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#include <algorithm>
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#include <stack>
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#include <queue>
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using namespace std;
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int main ()
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{
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char com[100][100];
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int vis[10000];
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int i,j,k=0,flag,fk,cot;
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while(gets(com[k]))
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{
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flag=0;
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while(com[k][0]!='0')
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{
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int num=strlen(com[k]);
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if(com[k][0]=='b'){flag++;fk=k;}
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if(com[k][num-1]=='m')flag++;
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k++;
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gets(com[k]);
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}
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if(flag<2)
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cout<<"No."<<endl;
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else
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{
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flag=0;
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memset(vis,0,sizeof(vis));
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queue<string>s;
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string t;
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vis[fk]=1;
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s.push(com[fk]);
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while(!s.empty())
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{
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t=s.front();
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s.pop();
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int num=t.length();
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char c=t[num-1];
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if(c=='m')
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{
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flag=1;
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break;
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}
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else
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{
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for(i=0;i<k;i++)
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{
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if(vis[i]==0&&com[i][0]==c)
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{
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vis[i]=1;
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s.push(com[i]);
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continue;
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}
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}
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}
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}
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if(flag)cout<<"Yes."<<endl;
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else cout<<"No."<<endl;
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}
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k=0;
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}
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return 0;
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}
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