hdu4006The kth great number【线段树第k大】

The kth great number

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65768/65768 K (Java/Others)
Total Submission(s): 9072    Accepted Submission(s): 3592

Problem Description

Xiao Ming and Xiao Bao are playing a simple Numbers game. In a round Xiao Ming can choose to write down a number, or ask Xiao Bao what the kth great number is. Because the number written by Xiao Ming is too much, Xiao Bao is feeling giddy. Now, try to help Xiao Bao.

 

Input

There are several test cases. For each test case, the first line of input contains two positive integer n, k. Then n lines follow. If Xiao Ming choose to write down a number, there will be an " I" followed by a number that Xiao Ming will write down. If Xiao Ming choose to ask Xiao Bao, there will be a "Q", then you need to output the kth great number.

 

Output

The output consists of one integer representing the largest number of islands that all lie on one line.

 

Sample Input

   
   
   
   

    
    
    
    8 3
I 1
I 2
I 3
Q
I 5
Q
I 4
Q
   
   
   
   

 

Sample Output

   
   
   
   

    
    
    
    1
2
3


    
    
    
    
 
     
 
      Hint 
     
Xiao Ming won't ask Xiao Bao the kth great number when the number of the written number is smaller than k. (1=<k<=n<=1000000). 
    
    
    
    
     
   
   
   
   

 

Source

The 36th ACM/ICPC Asia Regional Dalian Site —— Online Contest

 

Recommend

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比上一个题弱了很多啊

/******************
hdu4006
2016.3.8
265MS	27104K	1383B	C++
******************/
#include <iostream>
#include<cstdio>
#include<cstring>
using namespace std;
#define maxn 1000000
struct node
{
    int l,r,tot;
}num[maxn*8];
void build(int rt,int l,int r)
{
    num[rt].l=l;num[rt].r=r;
    if(l==r)
    {
        num[rt].tot=0;
        return;
    }
    int mid=(l+r)/2;
    build(rt<<1,l,mid);
    build(rt<<1|1,mid+1,r);
    num[rt].tot=0;
}
void update(int rt,int pos)
{
    if(num[rt].l==num[rt].r)
    {
        if(num[rt].l==pos) num[rt].tot++;
        return;
    }
    int mid=(num[rt].l+num[rt].r)/2;
    if(pos<=mid) update(rt<<1,pos);
    else update(rt<<1|1,pos);
    num[rt].tot=num[rt<<1].tot+num[rt<<1|1].tot;
}
int query(int rt,int k)
{
    if(k>num[rt<<1|1].tot)
    {
        if(num[rt].l==num[rt].r)
        {
            return num[rt].l;
        }
        query(rt<<1,k-num[rt<<1|1].tot);
    }
    else query(rt<<1|1,k);
}
int main()
{
   // freopen("cin.txt","r",stdin);
    int n,k,a;
    char st[3];
    while(~scanf("%d%d",&n,&k))
    {
        build(1,1,maxn);
        while(n--)
        {
            scanf("%s",st);
            if(st[0]=='I')
            {
                scanf("%d",&a);
                update(1,a);
            }
            else printf("%d\n",query(1,k));
        }
    }
    return 0;
}