10148 - Advertisement-贪心，区间选点有关问题-水题

10148 - Advertisement-----贪心，区间选点问题------水题

#include<cstdlib>
#include<iostream>
#include<cstdio>
#include<cmath>
#include<set>
#include<cstring>
#include <algorithm>
#define inf 0x7fffffff
#define N 1000
#define MIN 1e-11
#define M 10001
#define MM 20020
#define LL long long
using namespace std;
int n,t,k;
struct S
{
    int a,b;
};
int v[MM];
S s[N];
int cmp(S s1,S s2)
{
    return s1.b<s2.b;
}
int main()
{
#ifndef ONLINE_JUDGE
    freopen("ex.in","r",stdin);
#endif
    scanf("%d",&t);
    while(t--)
    {
        memset(v,0,sizeof(v));

        scanf("%d%d",&k,&n);
        int minv=inf,maxv=-inf;
        for(int i=0; i<n; ++i)
        {
            scanf("%d%d",&s[i].a,&s[i].b);
            if(s[i].a>s[i].b)
                swap(s[i].a,s[i].b);
            if(minv>s[i].a)
                minv=s[i].a;
            if(minv>s[i].b)
                minv=s[i].b;
            if(maxv<s[i].b)
                maxv=s[i].b;
            if(maxv<s[i].a)
                maxv=s[i].a;

        }

        sort(s,s+n,cmp);
//        for(int i=0;i<n;i++)
//        cout<<"i="<<i<<"    "<<s[i].a<<"    "<<s[i].b<<endl;
        int num,cnt,count=0;
        for(int i=0; i<n; ++i)
        {
            if(s[i].b-s[i].a+1<=k)
                {
                    for(int j=s[i].a; j<=s[i].b; j++)
                    if(!v[j+M])
                    {
                        count++;
                        v[j+M]=1;
                    }
                }
            else
            {

                cnt=0;
                for(int j=s[i].a; j<=s[i].b; j++)
                {
                    if(v[j+M])
                        cnt++;
                    if(cnt>=k)
                        break;
                }
                num=0;

                cnt=k-cnt;
                for(int j=s[i].b; j>=s[i].a; j--)
                {
                    if(num==cnt)
                            break;
                    if(!v[j+M])
                    {
                        count++;
                        num++;
                        v[j+M]=1;

                    }
                }

            }
        }

        printf("%d\n",count);
        for(int i=minv;i<=maxv;i++)
        if(v[i+M])
        printf("%d\n",i);

        if(t)
        {
            printf("\n");
        }
        
    }

    return 0;
}