厌氧代码？

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <vector>

#ifdef _WIN32
	#define getchar_unlocked getchar
	#define putchar_unlocked putchar
#else
	#define getchar getchar_unlocked
	#define putchar putchar_unlocked
#endif

// #define x first
// #define y second
#define mem(a,b) memset((a),(b),sizeof(a))
constexpr int L=1*1e6+10; // L!=1e9+10

typedef long long LL;
// typedef unsigned long long ULL;
// typedef std::pair<int,int> PII;
// typedef std::priority_queue<int,std::vector<int>,std::greater<int> > P_Q;
// typedef std::priority_queue<int,std::vector<int>,std::less<int> > _P_Q;
// typedef __int128 INT

// constexpr int N=;
// constexpr int M=;
constexpr int inf=0x3f3f3f3f;
constexpr signed err=-1;
constexpr double eps=1e-8;
const double pi=acos(-1.0);
constexpr int dx[]={0, 0, 1,-1, 1, 1,-1,-1};
constexpr int dy[]={1,-1, 0, 0, 1,-1,-1, 1};
// constexpr LL mod=1e9+7;

#define I using
#define AK namespace
#define NOIP_2024 std
I AK NOIP_2024;

template<typename T>
void debug(string name="(NaN)",vector<T> v={-1})
{
	cout<<"\n***"<<name<<"***\n";
	for(typename vector<T>::const_iterator it=v.begin();it!=v.end();it++)
		cout<<*it<<' ';
	cout<<"\n****************\n";
}

inline LL read()
{
	int f=1;
	LL x=0;
	char c=getchar_unlocked();

	while(c<'0'||c>'9')
	{
		if(c=='-')
			f=-1;
		c=getchar_unlocked();
	}
	
	while('0'<=c&&c<='9')
	{
		x=(x<<3)+(x<<1)+(c^48);
		c=getchar_unlocked();
	}

	return f*x;
}

inline void _write(LL x)
{
	if(x<0)
	{
		putchar_unlocked('-');
		x=-x;
	}
	if(x>9)
		_write(x/10);
	putchar_unlocked(x%10+'0');
	
	return;
}

inline void write(LL x,short op=0)/* op>0:x+Space;
	   				 		 		 op==0:x;
									 op<0:x+endl.*/
{
	_write(x);
	if(op==0)
		return;
	else if(op>0)
		putchar_unlocked(' ');
	else
		putchar_unlocked('\n');
	return;
}

inline void write_s(string s)
{
	int len=s.size();
	for(int i=0;i<len;i++)
		putchar_unlocked(s[i]);
}

int n,w;
int st[L],len=1;
int s[L],maxn=err;

//#define ONLINE_JUDGE
signed main()
{
//	#ifndef ONLINE_JUDGE
//		freopen("star.in","r",stdin);
//		freopen("star.out","w",stdout);
//	#endif
	
	n=read();
	w=read();
	for(int i=1;i<=n;i++)
	{
		int x=read();
		int b=read();
		st[x]+=b;
		len=max(len,x);
	}
	for(int i=1;i<=len;i++)
	{
		s[i]=s[i-1]+st[i];
	}
	for(int i=1;i<=len;i++)
	{
		maxn=max(maxn,s[i]-s[i-w]);
	}	
	write(maxn,err);
	
	return 0;
}