GYM 100685 K

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乱搞题
统计每一个不是magic word的单词，然后每个make_pair
然后按照公式计算答案。
因为这里是乱序的统计make_pair的情况，所以如果相邻的是相同的就会多统计一倍，在计算答案的是就要去掉，如果你保证字典序小的在前面，那就无所谓啦。

//      whn6325689
//      Mr.Phoebe
//      http://blog.csdn.net/u013007900
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <cstring>
#include <climits>
#include <complex>
#include <fstream>
#include <cassert>
#include <cstdio>
#include <bitset>
#include <vector>
#include <deque>
#include <queue>
#include <stack>
#include <ctime>
#include <set>
#include <map>
#include <cmath>
#include <functional>
#include <numeric>
#pragma comment(linker, "/STACK:1024000000,1024000000")using namespace std;#define eps 1e-9
#define PI acos(-1.0)
#define INF 0x3f3f3f3f
#define LLINF 1LL<<62
#define speed std::ios::sync_with_stdio(false);typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef complex<ld> point;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;
typedef vector<int> vi;#define CLR(x,y) memset(x,y,sizeof(x))
#define CPY(x,y) memcpy(x,y,sizeof(x))
#define clr(a,x,size) memset(a,x,sizeof(a[0])*(size))
#define cpy(a,x,size) memcpy(a,x,sizeof(a[0])*(size))
#define debug(a) cout << #a" = " << (a) << endl;
#define debugarry(a, n) for (int i = 0; i < (n); i++) { cout << #a"[" << i << "] = " << (a)[i] << endl; }#define mp(x,y) make_pair(x,y)
#define pb(x) push_back(x)
#define lowbit(x) (x&(-x))#define MID(x,y) (x+((y-x)>>1))
#define ls (idx<<1)
#define rs (idx<<1|1)
#define lson ls,l,mid
#define rson rs,mid+1,rtemplate<class T>
inline bool read(T &n)
{T x = 0, tmp = 1;char c = getchar();while((c < '0' || c > '9') && c != '-' && c != EOF) c = getchar();if(c == EOF) return false;if(c == '-') c = getchar(), tmp = -1;while(c >= '0' && c <= '9') x *= 10, x += (c - '0'),c = getchar();n = x*tmp;return true;
}
template <class T>
inline void write(T n)
{if(n < 0){putchar('-');n = -n;}int len = 0,data[20];while(n){data[len++] = n%10;n /= 10;}if(!len) data[len++] = 0;while(len--) putchar(data[len]+48);
}
//-----------------------------------set<string> m;
string str[4005];
ll tot=0;
map<string,ll> cnt;
map<pair<string,string>,ll> cntp;
string pre,now;
int main()
{
//freopen("data.txt","r",stdin);speedint n,k,q;cin>>n;getline(cin,now);for(int i=1;i<=n;i++){getline(cin,str[i]);for(int j=0;j<str[i].length();j++){if('A'<=str[i][j] && str[i][j]<='Z')str[i][j]-='A'-'a';if(!(str[i][j]>='a'&&str[i][j]<='z'))str[i][j]=' ';}}cin>>k;while(k--){cin>>now;m.insert(now);}stringstream ss;bool first=1;for(int i=1;i<=n;i++){ss.str(str[i]);while(ss>>now){if(m.find(now)==m.end()){tot++;cnt[now]++;if(first)first=0;else{cntp[mp(pre,now)]++;cntp[mp(now,pre)]++;}pre=now;}}ss.clear();}cin>>q;while(q--){cin>>pre>>now;if(cntp.find(mp(pre,now))!=cntp.end()){double ans=1.0*tot*tot*(cntp[mp(pre,now)])/(1.0*cnt[pre]*cnt[now]*(tot-1));if(pre==now)    ans/=2.0;cout<<setiosflags(ios::fixed)<<setprecision(10)<<ans<<endl;}elsecout<<"0.0000000000"<<endl;}return 0;
}

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