我的代码其他部分都没问题，但是函数中 return 的正负 2147483647 都返回的是 1e9，你们有什么头猪吗？

代码如下：

#include<bits/stdc++.h>
#define fo(x,y,z) for(int (x)=(y);(x)<=(z);(x)++) 
#define fu(x,y,z) for(int (x)=(y);(x)>=(z);(x)--)
#define fuck printf("####~~~&*&*&~~~####\n"); 
typedef long long ll;
typedef unsigned long long ull; 
using namespace std;
#define lx int
inline lx qr()
{
	char ch=getchar();lx x=0,f=1;
	for(;ch<'0'||ch>'9';ch=getchar())if(ch=='-')f=-1;
	for(;ch>='0'&&ch<='9';ch=getchar())x=(x<<3)+(x<<1)+(ch^48);
	return x*f;
}
#undef lx
#define qr qr()
const int Ratio=0;
const int N=2e6+5;
const int maxx=1e9;
int son[N][2],v[N],siz[N],fa[N];
int T[N],w[N];
int tot,root;
namespace Wisadel
{
	#define ls(x) son[x][0]
	#define rs(x) son[x][1]
	void Wpushup(int x)
	{
		siz[x]=siz[ls(x)]+siz[rs(x)]+1;
	}
	void Wrotate(int x)
	{
		int y=fa[x],z=fa[y],fla=rs(y)==x;
		son[z][rs(z)==y]=x,fa[x]=z;
		son[y][fla]=son[x][!fla],fa[son[x][!fla]]=y;
		son[x][!fla]=y,fa[y]=x;
		Wpushup(y),Wpushup(x);
	}
	void Wsplay(int &root,int x,int k)
	{
		while(fa[x]!=k)
		{
			int y=fa[x],z=fa[y];
			if(z!=k)
				((rs(y)==x)^(rs(z)==y))?Wrotate(x):Wrotate(y);
			Wrotate(x);
		}
		if(!k) root=x;
	}
	void Wins(int &root,int x)
	{
		int c=root,f=0;
		while(c) f=c,c=son[c][x>v[c]];
		c=++tot;
		if(f) son[f][x>v[f]]=c;
		v[c]=x,fa[c]=f;
		siz[c]=1;
		Wsplay(root,c,0);
	}
	int Wqshu(int root,int x)
	{
		int c=root,res=0;
		while(c)
			if(x<=v[c]) c=ls(c);
			else res+=siz[ls(c)]+1,c=rs(c);
		return res; 
	}
	void Wupd(int &root,int x,int y)
	{
		int c=root;
		while(c)
		{
			if(v[c]==x) break;
			if(v[c]>x) c=ls(c);
			else c=rs(c);
		}
		Wsplay(root,c,0);
		int l=ls(c),r=rs(c);
		while(rs(l)) l=rs(l);
		while(ls(r)) r=ls(r);
		Wsplay(root,l,0),Wsplay(root,r,l);
		ls(r)=0;
		Wpushup(r),Wpushup(l);
		Wins(root,y);
	}
	#define lson (rt<<1)
	#define rson (rt<<1|1)
	#define mid ((l+r)>>1)
	void Wbuild(int rt,int l,int r)
	{
		Wins(T[rt],-maxx),Wins(T[rt],maxx);
		fo(i,l,r) Wins(T[rt],w[i]);
		if(l==r) return;
		Wbuild(lson,l,mid),Wbuild(rson,mid+1,r);
	}
	int Wq(int rt,int l,int r,int x,int y,int k)
	{
		if(x<=l&&r<=y) return Wqshu(T[rt],k)-1;
		int res=0;
		if(x<=mid) res+=Wq(lson,l,mid,x,y,k);
		if(y>mid) res+=Wq(rson,mid+1,r,x,y,k);
		return res;
	}
	void Wchange(int rt,int l,int r,int x,int k)
	{
		Wupd(T[rt],w[x],k);
		if(l==r) return;
		if(x<=mid) Wchange(lson,l,mid,x,k);
		else Wchange(rson,mid+1,r,x,k);
	}
	int Wquepre(int root,int x)
	{
		int c=root,res=-maxx;
		while(c)
			if(x<=v[c]) c=ls(c);
			else res=max(res,v[c]),c=rs(c);
		return res;
	}
	int Wquesuc(int root,int x)
	{
		int c=root,res=maxx;
		while(c)
			if(x>=v[c]) c=rs(c);
			else res=min(res,v[c]),c=ls(c);
		return res;
	}
	ll Wqpre(int rt,int l,int r,int x,int y,int k)
	{
		if(l>y||r<x) return -2147483647;
		if(x<=l&&r<=y) return Wquepre(T[rt],k);
		return max(Wqpre(rson,mid+1,r,x,y,k),Wqpre(lson,l,mid,x,y,k));
	}
	ll Wqsuc(int rt,int l,int r,int x,int y,int k)
	{
		if(l>y||r<x) return 2147483647;
		if(x<=l&&r<=y) return Wquesuc(T[rt],k);
		return min(Wqsuc(rson,mid+1,r,x,y,k),Wqsuc(lson,l,mid,x,y,k));
	}
	#undef mid
	short main()
	{
		// freopen("P3380_1.in","r",stdin),freopen("1.out","w",stdout);
		int n=qr,m=qr;
		fo(i,1,n) w[i]=qr;
		Wbuild(1,1,n);
		while(m--)
		{
			int op=qr;int a,b,c,l,r;
			switch(op)
			{
				case 1:
					a=qr,b=qr,c=qr;
					printf("%d\n",Wq(1,1,n,a,b,c)+1);
					break;
				case 2:
					a=qr,b=qr,c=qr;
					l=0,r=1e8;
					while(l<r)
					{
						int mid=(l+r+1)>>1;
						if(Wq(1,1,n,a,b,mid)+1<=c) l=mid;
						else r=mid-1;
					}
					printf("%d\n",r);
					break;
				case 3:
					a=qr,b=qr;
					Wchange(1,1,n,a,b);
					w[a]=b;
					break;
				case 4:
					a=qr,b=qr,c=qr;
					printf("%lld\n",Wqpre(1,1,n,a,b,c)==(int)-1e9?-2147483647:Wqpre(1,1,n,a,b,c));
					break;
				case 5:
					a=qr,b=qr,c=qr;
					printf("%lld\n",Wqsuc(1,1,n,a,b,c)==(int)1e9?2147483647:Wqsuc(1,1,n,a,b,c));
			}
		}
		return Ratio;
	}
}
int main(){return Wisadel::main();}