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  • Luogu P1903 [国家集训队]数颜色 / 维护队列 (带修莫队)

    
    #include <cstdio> 
    #include <cstring>
    #include <iostream>
    #include <algorithm>
    #include <cmath>
    #define R(a,b,c) for( register int (a) = (b); (a) <= (c); ++(a))
    #define nR(a,b,c) for( register int (a) = (b); (a) >= (c); --(a))
    #define Max(a,b) ((a) >= (b) ? (a) : (b))
    #define Min(a,b) ((a) <= (b) ? (a) : (b))
    #define Iv inline void
    #define Ii inline int
    #define Il inline long long
    #define ll long long
    #define re register
    struct ios{
    	template <typename ATP> inline ios& operator >> (ATP &x) {
    		x=0; int f=1; char c;
    		for (c=getchar(); c<'0' || c>'9'; c=getchar()) if(c == '-') f=-1;
    		while (c >= '0' && c <= '9') x = x * 10 + (c ^ '0'), c=getchar();
    		x*=f;
    		return *this;
    	}
    	template <typename ATP> inline ios& operator << (ATP x) {
    		int digit = 0; char sch[67];
    		if( x == 0) { putchar ('0'); return *this;}
    		if (x < 0) { x = -x, putchar ('-');}
    		while (x) sch[++digit]=x % 10 ^ '0', x /= 10;
    		for (register int i=digit; i; --i) putchar (sch[i]);
    		return *this;
    	}
    } io;
    using namespace std;
    //#define InputAndOutput_Bug_Test
    #ifdef InputAndOutput_Bug_Test
    int main(){
    	while (1) {
    		long long x;
    		io >> x;
    		cout << x << endl;
    		io << x;
    		putchar ('
    ');
    	}
    }
    #endif
    const int N=50007;
    int col[N];
    int TotColor[1000007],NowColor[N];
    int block[N];
    int ans[N],Ans;
    int l=1,r;
    
    struct Query{
    	int l,r,tim,id;
    	bool operator< (const Query &b)const{
    		if(block[l]==block[b.l]){
    			if(block[r]==block[b.r])
    				return tim<b.tim;
    			else
    				return r<b.r;
    		}
    		else
    			return l<b.l;
    	}
    }q[N];
    
    struct Change{
    	int pos,New,Old;	
    }c[N]; 
    
    Iv Modify(int workColor,int d){
    	TotColor[workColor]+=d;
    	if(d>0)
    		Ans+=(TotColor[workColor]==1);
    	if(d<0)
    		Ans-=(TotColor[workColor]==0);
    }
    Iv Going(int pos,int workColor){
    	if(l<=pos&&pos<=r){
    		Modify(workColor,1),
    		Modify(col[pos],-1);
    	}
    	col[pos]=workColor;
    }
    
    int main(){
    	int n,m; io>>n>>m;
    	int unit=pow(n,0.666666);
    	R(i,1,n){
    		io>>col[i],
    		NowColor[i]=col[i],
    		block[i]=(i-1)/unit+1;
    	}
    	
    	int tot=0,Time=0;
    	R(i,1,m){
    		char opt;
    		for(opt=getchar();opt!='Q'&&opt!='R';opt=getchar());
    		if(opt=='Q'){
    			int l,r;
    			io>>l>>r,
    			q[++tot]=(Query){l,r,Time,tot};
    		}
    		else{
    			int pos,newColor;
    			io>>pos>>newColor,
    			c[++Time]=(Change){pos,newColor,NowColor[pos]},
    			NowColor[pos]=newColor;
    		}
    	}
    	
    	sort(q+1,q+tot+1);
    	Time=0;
    	R(i,1,tot){
    		while(Time<q[i].tim) Going(c[Time+1].pos,c[Time+1].New),++Time;
    		while(Time>q[i].tim) Going(c[Time].pos,c[Time].Old),--Time;
    		while(l<q[i].l) Modify(col[l],-1),++l;
    		while(l>q[i].l) Modify(col[l-1],1),--l;
    		while(r<q[i].r) Modify(col[r+1],1),++r;
    		while(r>q[i].r) Modify(col[r],-1),--r;
    		
    		ans[q[i].id]=Ans;
    	} 
    	
    	R(i,1,tot){
    		io<<ans[i],
    		putchar('
    ');
    	
    	}
    	
    	return 0;
    } 
    
    
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  • 原文地址:https://www.cnblogs.com/bingoyes/p/11070265.html
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