#include<algorithm>
#include<iostream>
#include<cstdio>
#define inf 0x7fffffff
using namespace std;
inline int read(){
int x=0,f=1;char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
return x*f;
}
struct data{
int v,num;
}a[2501];
inline bool cmp(data a,data b){
return a.v<b.v;
}
int C,L,ans,l[2501],r[2501];
bool used[2501];
inline int find(int x){
int tmp=0......
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