UVA 11020 Efficient Solutions

mulitset可以当BST用。。。

Efficient Solutions Time Limit:3000MS Memory Limit:Unknown 64bit IO Format:%lld & %llu [Submit] [Go Back] [Status] Description Problem I Efficient Solutions Input: Standard Input Output: Standard Output "Our marriage ceremonies are solemn, sober moments of reflection; also regret, disagreement, argument and mutual recrimination. Once you know it can't get any worse, you can relax and enjoy the marriage." J. MichaelStraczynski, "The Deconstruction of Falling Stars." The princess of Centauri Prime is the galaxy's most eligiblebacheloretteof the year. She has hopeful grooms lined up in front of the royal palace for a chance to spend 5 minutes to try and impress her. After 5 minutes, the gentleman is carried out of the royal chambers by the palace guards, and the princess makes a decision. She rates the lad on his lineage and charm by giving him a score for each of the two properties. On Centauri Prime, low scores are better than high scores. Suppose that she observes two gentlemen - A and B. She assigns A the scores LAand CA(for lineage and charm, respectively). B receives scores LBand CB. Then A isdominatedby B if either LB< LAand CB<= CA, or LB<= LAand CB< CA. In other words, if at least one of B's scores is better than A's, and the other score is not worse. She considers a gentleman to beefficient(or Pareto-optimal) if she has not yet met any other gentleman who dominates him. She maintains alist of efficient groomsand updates it after each 5-minute presentation. Given the queue of bachelors and the scores assigned to them by the princess, determine the number of entries in thelist of efficient groomsafter each performance. Input Thefirst line of input gives the number of cases,N (0<N<40).Ntest cases follow. Each one starts with a line containingn(0≤n≤15000) - the size of the queue. The nextnlines will each contain two scores (integers in the range [0, 109]). Initially, the list is empty. Output For each test case, output one line containing "Case #x:" followed bynlines, lineicontaining the size of thelist of efficient groomsafter theithupdate. Print an empty line between test cases. Sample Input Sample Output 4 1 100 200 2 100 200 101 202 2 100 200 200 100 5 11 20 20 10 20 10 100 20 1 1 Case #1: 1 Case #2: 1 1 Case #3: 1 2 Case #4: 1 2 3 3 1 Problemsetter: IgorNaverniouk Special Thanks:YuryKholondyrev Warming: The judge input file size is about 1.2 MB. [Submit] [Go Back] [Status]

#include <iostream>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <set>

using namespace std;

struct POINT
{
	int x, y;
	bool operator<(const POINT res) const
	{
		if (x != res.x)
		{
			return x < res.x;
		}
		else
		{
			return y < res.y;
		}
	}
}P;

int main()
{
    multiset<POINT> msp;
    multiset<POINT>::iterator it;
    int t,n,cas=1;
    scanf("%d",&t);
    while(t--)
    {
        msp.clear();
        scanf("%d",&n);
        if(cas>1) putchar(10);
        printf("Case #%d:\n",cas++);
        for(int i=0;i<n;i++)
        {
            int a,b;
            scanf("%d%d",&a,&b);
            P=(POINT){a,b};
            it=msp.lower_bound(P);
            if(it==msp.begin()||(--it)->y>b)
            {
                msp.insert(P);
                it=msp.upper_bound(P);
                while(it!=msp.end()&&it->y>=b)
                {
                    msp.erase(it++);
                }
            }
            printf("%d\n",msp.size());
        }
    }
	return 0;
}