UVA 10129 play on Words--yhx

Each letter is treated as a node, and each word is viewed as a forward edge from the first letter to the last letter. The end-to-end of these words is equivalent to looking for a European path (a stroke).

It is required to meet two conditions: 1. After ignoring the direction of the edge, the original is connected. 2. The degree of penetration of one point is 1, the other is 1 less than the degree of penetration, and the other points are equal in degrees.

1#include <cstdio>2#include <cstring>3 using namespacestd;4 int inch[ -], out[ -],n;5 BOOLb[ -],map[ -][ -];6 voidDfsintp)7 {8     inti,j,k;9b[p]=1;Ten      for(i=0; i<= -; i++) One       if(map[p][i]&&!B[i]) A DFS (i); - } - BOOLOK () the { -     inti,j,k,x,y,z; -     BOOLb1,b2; -B1=b2=0; +      for(i=0; i<= -; i++) -       if(inch[i]!= out[i]) +       { A           if(inch[i]== out[i]+1)  at           { -               if(!B1) -b1=1; -               Else -                 return 0; -         } in           Else -           { to               if(inch[i]== out[i]-1) +               { -                   if(!B2) theB2=1; *                   Else $                     return 0;Panax Notoginseng             } -             Else return 0; the         } +       } A     if(B1!=B2)return 0; theI=0; +      while(inch[i]==0&& out[i]==0) i++; - DFS (i); $      for(i=0; i<= -; i++) $       if((inch[i]| | out[i]) &&!b[i])return 0; -     return 1; - } the intMain () - {Wuyi     inti,j,k,m,p,q,x,y,z,t; the     Chars[100010]; -scanf"%d",&t); Wu      for(i=1; i<=t;i++) -     { AboutMemsetinch,0,sizeof(inch)); $Memset out,0,sizeof( out)); -memset (b,0,sizeof(b)); -memset (Map,0,sizeof(map)); -scanf"%d\n",&n); A          for(j=1; j<=n;j++) +         { the gets (s); -map[s[0]-'a'][s[strlen (s)-1]-'a']=map[s[strlen (s)-1]-'a'][s[0]-'a']=1; $             inch[S[strlen (s)-1]-'a']++; the              out[s[0]-'a']++; the         } the         if(OK ()) printf ("Ordering is possible.\n"); the         Elseprintf"The door cannot be opened.\n"); -     } in}

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UVA 10129 play on Words--yhx