hdu2094

产生冠军的条件：（1）获胜的人没输过一次（2）最终获胜的人只有一个

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      #include
    
      "
    
      iostream
    
      "
    
      

    
      //
    
      #include"algorithm"
    
      

    
      using
    
       
    
      namespace
    
       std;

    
      #define
    
       M 1010
    
      

    
      int
    
       main()
{
 
    
      int
    
       n;
 
    
      int
    
       i,j;
 
    
      char
    
       a[M][
    
      100
    
      ],b[M][
    
      100
    
      ];
 
    
      int
    
       sum[M],c[M];
 
    
      while
    
      (cin
    
      >>
    
      n,n)
 {
 memset(sum,
    
      0
    
      ,
    
      sizeof
    
      (sum)); 
    
      //
    
      0表示失败
    
      

    
      
 
    
      for
    
      (i
    
      =
    
      0
    
      ;i
    
      <
    
      n;i
    
      ++
    
      )
 {
 cin
    
      >>
    
      a[i]
    
      >>
    
      b[i];
 sum[i]
    
      =
    
      1
    
      ; 
    
      //
    
       1表示获胜
    
      

    
       
 }

 
    
      for
    
      (i
    
      =
    
      0
    
      ;i
    
      <
    
      n;i
    
      ++
    
      )
 {
 
    
      for
    
      (j
    
      =
    
      0
    
      ;j
    
      <
    
      n;j
    
      ++
    
      )
 {
 
    
      if
    
      (strcmp(a[i],b[j])
    
      ==
    
      0
    
      ) { sum[i]
    
      =
    
      0
    
      ;}
 }
 }
 
 
    
      int
    
       k
    
      =
    
      0
    
      ;
 
    
      for
    
      (i
    
      =
    
      0
    
      ;i
    
      <
    
      n;i
    
      ++
    
      )
 {
 
    
      if
    
      (sum[i]
    
      ==
    
      1
    
      ) c[k
    
      ++
    
      ]
    
      =
    
      i;
 }
 
    
      //
    
      sort(c,c+k); 
    
      

    
       
    
      int
    
       flag
    
      =
    
      0
    
      ;
 
    
      for
    
      (i
    
      =
    
      1
    
      ;i
    
      <
    
      k;i
    
      ++
    
      )
 {
 
    
      if
    
      (strcmp(a[c[i]],a[c[i
    
      -
    
      1
    
      ]])
    
      ==
    
      0
    
      ) flag
    
      ++
    
      ;
 }

 
    
      if
    
      (flag
    
      ==
    
      k
    
      -
    
      1
    
      ) cout
    
      <<
    
      "
    
      Yes
    
      "
    
      <<
    
      endl;
 
    
      else
    
       cout
    
      <<
    
      "
    
      No
    
      "
    
      <<
    
      endl;
 }
 
    
      return
    
       
    
      0
    
      ;
}