OJ-Problems-Source/HDOJ/3726_autoAC.cpp
2016-09-04 14:14:07 +08:00

241 lines
5.4 KiB
C++

#include <stdio.h>
#include <string.h>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <time.h>
using namespace std;
#define Key_value ch[ch[root][1]][0]
const int MAXN = 20010;
int pre[MAXN],ch[MAXN][2],key[MAXN],size[MAXN];
int root;
void NewNode(int &r,int father,int loc,int k)
{
r = loc;
pre[r] = father;
ch[r][0] = ch[r][1] = 0;
key[r] = k;
size[r] = 1;
}
void push_up(int r)
{
size[r] = size[ch[r][0]] + size[ch[r][1]] + 1;
}
void Init()
{
root = 0;
ch[root][0] = ch[root][1] = key[root] = size[root] = 0;
pre[root] = 0;
}
void Rotate(int x,int kind)
{
int y = pre[x];
ch[y][!kind] = ch[x][kind];
pre[ch[x][kind]] = y;
if(pre[y])
ch[pre[y]][ch[pre[y]][1]==y] = x;
pre[x] = pre[y];
ch[x][kind] = y;
pre[y] = x;
push_up(y);
}
void Splay(int r,int goal)
{
while(pre[r] != goal)
{
if(pre[pre[r]] == goal)
Rotate(r,ch[pre[r]][0] == r);
else
{
int y = pre[r];
int kind = ch[pre[y]][0]==y;
if(ch[y][kind] == r)
{
Rotate(r,!kind);
Rotate(r,kind);
}
else
{
Rotate(y,kind);
Rotate(r,kind);
}
}
}
push_up(r);
if(goal == 0) root = r;
}
int Get_kth(int r,int k)
{
int t = size[ch[r][0]] + 1;
if(t == k)return r;
if(t > k)return Get_kth(ch[r][0],k);
else return Get_kth(ch[r][1],k-t);
}
void Insert(int loc,int k)
{
int r = root;
if(r == 0)
{
NewNode(root,0,loc,k);
return;
}
while(ch[r][key[r]<k])
r = ch[r][key[r]<k];
NewNode(ch[r][key[r]<k],r,loc,k);
Splay(ch[r][key[r]<k],0);
}
struct Edge
{
int u,v;
}edge[60010];
bool used[60010];
int to[400010];
int ne[400010];
int head[20010];
int tot;
void add_value(int x,int v)
{
to[tot] = v;
ne[tot] = head[x];
head[x] = tot++;
}
struct Query
{
char op[5];
int x,y;
}query[400010];
int q_num;
int F[20010];
int find(int x)
{
if(F[x] == -1)return x;
else return F[x] = find(F[x]);
}
void erase(int r)
{
if(!r)return;
erase(ch[r][0]);
erase(ch[r][1]);
Insert(r,to[head[r]]);
}
int Get_Min(int r)
{
while(ch[r][0])
{
r = ch[r][0];
}
return r;
}
void Delete()
{
if(ch[root][0] == 0 || ch[root][1] == 0)
{
root = ch[root][0] + ch[root][1];
pre[root] = 0;
return;
}
int k = Get_Min(ch[root][1]);
Splay(k,root);
Key_value = ch[root][0];
root = ch[root][1];
pre[ch[root][0]] = root;
pre[root] = 0;
push_up(root);
}
void bing(int x,int y)
{
int t1 = find(x),t2 = find(y);
if(t1 == t2)return;
F[t1] = t2;
Splay(t1,0);
Splay(t2,0);
if(size[t1] > size[t2])
swap(t1,t2);
root = t2;
erase(t1);
}
int main()
{
int N,M;
int iCase = 0;
while(scanf("%d%d",&N,&M) == 2 )
{
if(N == 0 && M == 0) break;
iCase++;
memset(head,-1,sizeof(head));
tot = 0;
int v;
for(int i = 1;i <= N;i++)
{
scanf("%d",&v);
add_value(i,v);
}
for(int i = 1;i <= M;i++)
{
scanf("%d%d",&edge[i].u,&edge[i].v);
}
q_num = 0;
memset(used,false,sizeof(used));
while(scanf("%s",&query[q_num].op) == 1)
{
if(query[q_num].op[0] == 'E')break;
if(query[q_num].op[0] == 'D')
{
scanf("%d",&query[q_num].x);
used[query[q_num].x] = true;
}
else if(query[q_num].op[0] == 'Q')
scanf("%d%d",&query[q_num].x,&query[q_num].y);
else if(query[q_num].op[0] == 'C')
{
scanf("%d%d",&query[q_num].x,&query[q_num].y);
add_value(query[q_num].x,query[q_num].y);
}
q_num++;
}
memset(F,-1,sizeof(F));
for(int i = 1;i <= N;i++)
NewNode(root,0,i,to[head[i]]);
for(int i = 1;i <= M;i++)
if(!used[i])
bing(edge[i].u,edge[i].v);
double ans = 0;
int cnt = 0;
for(int i = q_num-1; i>= 0 ;i--)
{
if(query[i].op[0] == 'Q')
{
Splay(query[i].x,0);
if(size[root] < query[i].y || query[i].y <= 0)
{
cnt++;
continue;
}
ans += key[Get_kth(root,size[root] - query[i].y + 1)];
cnt++;
}
else if(query[i].op[0] == 'D')
{
int tmp = query[i].x;
bing(edge[tmp].u,edge[tmp].v);
}
else if(query[i].op[0] == 'C')
{
Splay(query[i].x,0);
Delete();
head[query[i].x] = ne[head[query[i].x]];
Insert(query[i].x,to[head[query[i].x]]);
}
}
if(cnt == 0)cnt = 1;
printf("Case %d: %.6lf\n",iCase,ans/cnt);
}
return 0;
}