F. Contestants Ranking
Ahmad is one of the best students in HIAST, and also a very good problems Solver. In the time you will spend reading this problem statement Ahmad would have solved a problem. Maybe, even two... Ahmad participated so many times in programming contest (ACM-HCPC) with several teams. many of the former and present contestants at HIAST have known Ahmad for quite a few years. Some of them are proud to say that they either played in the same team with him or played in the same team with one of his teammates... Let us define ranking number as follows. Ahmad's ranking is 0, for people who played in the same team with him, the ranking is 1. For people who never played with Ahmad but played in the same team with one or more of his teammates, the ranking is 2, and so on. Your task is to automate the process of calculating the ranking numbers for each contestant at HIAST.
The first line of input file contains the number of test cases (0<T<10). Each test case will begin with one line containing the number of teams (1<N ≤ 100). In each of the following N lines you are given the names of the three members of the corresponding team. Each name is a nonempty string contains only English letters starts with capital letter, and its length is at most 20 symbols. Same student can be found in more than one team, but each student should have only one rank. Ahmad will be found in one team at least. The first letter of a name is capital and the other letters are lowercase and each name will consist of only one word.
For each test case output a line with the number of contestants, then for each contestant output a line with his name and his ranking. If the ranking is undefined, output “undefined” instead of it. The contestants must be ordered by rank from 0 to undefined and then lexicographical by name.
2
1
Ahmad Mousaab Khalid
7
Ahmad Mousaab Khalid
Ali Mousaab Nizar
Ali Bassel Nizar
Kassem Ahmad Mousaab
Saeed Kassem Fadel
Salwa Saeed Samer
Mona Abdo Qussi
3
Ahmad 0
Khalid 1
Mousaab 1
14
Ahmad 0
Kassem 1
Khalid 1
Mousaab 1
Ali 2
Fadel 2
Nizar 2
Saeed 2
Bassel 3
Salwa 3
Samer 3
Abdo undefined
Mona undefined
Qussi undefined
题目链接：http://codeforces.com/gym/100952/problem/F
题意：Ahmad是最厉害的acmer，他的排名是0，所有与他组队打比赛的人的排名都是1，没有和他组过队但是和排名为1的人组过对的人排名为2，以此类推求出所有可以求得排名的人的排名，按排名小到大的顺序输出，如果排名相同按字典序小到大输出，最后按名字字典序小到达输出不能求得排名的
下面给出AC代码：
1 #include <bits/stdc++.h> 2 using namespace std; 3 inline int read() 4 { 5 int x=0,f=1; 6 char ch=getchar(); 7 while(ch<'0'||ch>'9') 8 { 9 if(ch=='-') 10 f=-1; 11 ch=getchar(); 12 } 13 while(ch>='0'&&ch<='9') 14 { 15 x=x*10+ch-'0'; 16 ch=getchar(); 17 } 18 return x*f; 19 } 20 inline void write(int x) 21 { 22 if(x<0) 23 { 24 putchar('-'); 25 x=-x; 26 } 27 if(x>9) 28 write(x/10); 29 putchar(x%10+'0'); 30 } 31 typedef pair<int,int>pi; 32 const int maxn=1e9; 33 const int N=444; 34 int score[N]; 35 map<string,int>M; 36 int cnt,tcase,query; 37 string s1,s2,s3; 38 string name[N]; 39 vector<int>ed[N]; 40 int index[N]; 41 inline void BFS(int k) 42 { 43 queue<int>Q; 44 Q.push(k); 45 while(!Q.empty()) 46 { 47 int u=Q.front(); 48 Q.pop(); 49 for(int i=0;i<ed[u].size();i++) 50 { 51 int v=ed[u][i]; 52 if(score[v]<maxn) 53 continue; 54 score[v]=score[u]+1; 55 Q.push(v); 56 } 57 } 58 } 59 int pos; 60 inline bool cmp(int x,int y) 61 { 62 if(score[x]==score[y]) 63 return name[x]<name[y]; 64 return score[x]<score[y]; 65 } 66 int main() 67 { 68 tcase=read(); 69 while(tcase--) 70 { 71 pos=-1; 72 query=read(); 73 M.clear(); 74 cnt=0; 75 while(query--) 76 { 77 cin>>s1>>s2>>s3; 78 if(!M[s1]) 79 { 80 M[s1]=++cnt; 81 name[cnt]=s1; 82 if(s1=="Ahmad") 83 pos=cnt; 84 } 85 if(!M[s2]) 86 { 87 M[s2]=++cnt; 88 name[cnt]=s2; 89 if(s2=="Ahmad") 90 pos=cnt; 91 } 92 if(!M[s3]) 93 { 94 M[s3]=++cnt; 95 name[cnt]=s3; 96 if(s3=="Ahmad") 97 pos=cnt; 98 } 99 int a=M[s1]; 100 int b=M[s2]; 101 int c=M[s3]; 102 ed[a].push_back(b); 103 ed[a].push_back(c); 104 ed[b].push_back(c); 105 ed[b].push_back(a); 106 ed[c].push_back(a); 107 ed[c].push_back(b); 108 } 109 if(pos==-1) 110 { 111 for(int i=1;i<=cnt;i++) 112 cout <<name[i]<<"undefined "<<endl; 113 continue; 114 } 115 for(int i=1;i<=cnt;i++) 116 score[i]=maxn; 117 score[pos]=0; 118 BFS(pos); 119 for(int i=1;i<=cnt;i++) 120 index[i]=i; 121 sort(index+1,index+1+cnt,cmp); 122 write(cnt); 123 printf(" "); 124 for(int j=1;j<=cnt;j++) 125 { 126 int i=index[j]; 127 cout<<name[i]<<" "; 128 if(score[i]==maxn) 129 cout<<"undefined"<<endl; 130 else write(score[i]),cout<<endl; 131 } 132 for(int i=1;i<=cnt;i++) 133 ed[i].clear(); 134 } 135 return 0; 136 }