bzoj2054 疯狂的馒头

神仙题orzorzorz

每个点只会被最后一次染色到，倒着做就行了

#include<bits/stdc++.h>
#define il inline
#define vd void
typedef long long ll;
il int gi(){
	int x=0,f=1;
	char ch=getchar();
	while(!isdigit(ch)){
		if(ch=='-')f=-1;
		ch=getchar();
	}
	while(isdigit(ch))x=x*10+ch-'0',ch=getchar();
	return x*f;
}
int fa[1000100];
int col[1000100];
int l[10000100],r[10000100];
il int hd(int x){return fa[x]==x?x:fa[x]=hd(fa[x]);}
il vd Union(int a,int b){fa[hd(a)]=hd(b);}
int main(){
#ifndef ONLINE_JUDGE
	freopen("2054.in","r",stdin);
	freopen("2054.out","w",stdout);
#endif
	int n=gi(),m=gi(),p=gi(),q=gi();
	for(int i=1;i<=m;++i){
		l[i]=(i*p+q)%n+1,r[i]=(i*q+p)%n+1;
		if(l[i]>r[i])std::swap(l[i],r[i]);
	}
	for(int i=1;i<=n+1;++i)fa[i]=i;
	for(int i=m;i;--i)
		for(int j=hd(l[i]);j<=r[i];j=hd(j))
			col[j]=i,Union(j,j+1);
	for(int i=1;i<=n;++i)printf("%d
",col[i]);
	return 0;
}