hdu 1199 Color the Ball 离散线段树

#include <cstdio>
#include <cmath>
#include <cstring>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
#include <sstream>
#include <queue>
#include <typeinfo>
#include <fstream>
typedef long long ll;
using namespace std;
//freopen("D.in","r",stdin);
//freopen("D.out","w",stdout);
#define sspeed ios_base::sync_with_stdio(0);cin.tie(0)

const int inf=0x7fffffff;   //无限大
char op[3];
struct interval
{
    int start,endn;
    bool operator < (const interval& b)const{
        if(start!=b.start)
            return start<b.start;
        else
            return endn<b.endn;
    }
};
interval val[20001];
void white(int a,int b,int& cnt)
{
    val[cnt].start=a;
    val[cnt].endn=b;
    cnt++;
}
void black(int a,int b,int& cnt)
{
    int tmp=cnt;
    for(int i=0;i<cnt;i++)
    {
        if(val[i].start<a)
        {
            if(val[i].endn>=a)
            {
                if(val[i].endn<=b)
                {
                    val[i].endn=a-1;
                }
                else
                {
                    val[tmp].start=b+1;
                    val[tmp].endn=val[i].endn;
                    tmp++;
                    val[i].endn=a-1;
                }
            }
        }
        else if(val[i].start<=b)
        {
            if(val[i].endn<=b)
            {
                val[i].start=0;
                val[i].endn=-1;
            }
            else
            {
                val[i].start=b+1;
            }
        }
    }
    cnt=tmp;
}
int solve(int cnt,int& index)
{
    sort(val,val+cnt);
    int maxn=val[0].endn-val[0].start+1;
    for(int i=1;i<cnt;i++)
    {
        if(val[i].start!=0)
        {
            if(val[i].start<=val[i-1].endn+1)
            {
                if(val[i-1].endn<=val[i].endn)
                {
                    val[i].start=val[i-1].start;
                }
                else
                {
                    val[i].start=val[i-1].start;
                    val[i].endn=val[i-1].endn;
                }
            }
            if(val[i].endn-val[i].start+1>maxn)
            {
                maxn=val[i].endn-val[i].start+1;
                index=i;
            }
        }
    }
    return maxn;
}
int main()
{
    int n,index,a,b,c;
    while(cin>>n)
    {
        int cnt=0;
        for(int i=0;i<n;i++)
        {
            scanf("%d%d%s",&a,&b,op);
            if(a>b)
            {
                swap(a,b);
            }
            if(op[0]==‘w‘)
                white(a,b,cnt);
            else
                black(a,b,cnt);
        }
        index=0;
        if(solve(cnt,index))
        {
            cout<<val[index].start<<" "<<val[index].endn<<endl;
        }
        else
            cout<<"Oh, my god"<<endl;
    }
    return 0;
}