【bzoj3441】乌鸦喝水

#include<ctime>
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<map>
#include<set>
#include<queue>
#include<deque>
#include<stack>
#include<bitset>
#include<vector>
#include<algorithm>
#include<iostream>
#include<deque>
using namespace std;
namespace mine
{
	typedef long long ll;
	#define double long double
	const int INF=0x3f3f3f3f;
	ll ()
	{
		ll ans=0;char c=getchar();int f=1;
		while(c<'0' or c>'9') {if(c=='-') f=-1;c=getchar();}
		while('0'<=c and c<='9') ans=ans*10+c-'0',c=getchar();
		return ans*f;
	}
	void write(ll num)
	{
		if(num<0) {num=-num;putchar('-');}
		if(num>9) write(num/10);
< 大专栏  【bzoj3441】乌鸦喝水div class="line">		putchar('0'+num%10);
	}
	void writeln(int num){write(num);puts("");}
	#define FR first
	#define SE second
	#define MP make_pair
	#define pr pair<ll,ll>
	#define PB push_back
	inline void chmax(ll &x,ll y) {x=x>y?x:y;}
	inline void chmin(ll &x,ll y) {x=x<y?x:y;}
	const int MAX_N=1e5+10;
	int bin[30];
	struct BIT
	{
		int bit[MAX_N];BIT(){memset(bit,0,sizeof bit);}
		int lowbit(int x) {return x&-x;}
		void add(int x,int c) {while(x<MAX_N) bit[x]+=c,x+=lowbit(x);}
		int ask(int x) {int ans=0;while(x>=1) ans+=bit[x],x-=lowbit(x);return ans;}
		int findk(int k)
		{
			int ans=0;
			for(int i=20;i>=0;i--) if(ans+bin[i]<MAX_N and k>=bit[ans+bin[i]]) k-=bit[ans+bin[i]],ans+=bin[i];
			return ans;
		}
	}bit;
	pr a[MAX_N];
	void main()
	{
		bin[0]=1;for(int i=1;i<30;i++) bin[i]=bin[i-1]<<1;
		int n,m,all;scanf("%d%d%d",&n,&m,&all);
		for(int i=1;i<=n;i++) a[i].FR=all-qread()+1;
		for(int i=1;i<=n;i++) a[i].FR=ceil((double)a[i].FR/qread()),a[i].SE=i,bit.add(i,1);
		sort(a+1,a+n+1);
		ll ans=0,dec=0;int turn=1,pos=1;//pos=应从哪里开始
		for(int i=1;i<=n and turn<=m;i++)
		{
			int rk=bit.ask(pos);
			ll tmp=a[i].FR-dec;int me=bit.ask(a[i].SE);
			if(tmp>0)
			{
				int rk2=(tmp+rk-1)%(n-i+1),t2=(tmp+rk-1)/(n-i+1);
				if(rk2==0) rk2=n-i+1,t2--;
				if(turn+t2>m) {ans+=ll(m-turn)*(n-i+1)+(n-i+1-rk+1);break;}
				turn+=t2;dec+=tmp;ans+=tmp;
				if((me==n-i+1 and rk2==n-i) or rk2==n-i+1) rk2=1,turn++;
				else if(rk2<me) rk2++;
				bit.add(a[i].SE,-1);
				pos=bit.findk(rk2);
			}
			else
			{
				if(rk>me) rk--;
				if(rk==n-i+1) rk=1,turn++;
				bit.add(a[i].SE,-1);
				pos=bit.findk(rk);
			}
		}
		printf("%lld",ans);
 	}
};
int main()
{
	srand(time(0));
	mine::main();
}