제출 #923954

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
923954		Xiaoyang	Self Study (JOI22_ho_t2)	C++17	0 / 100	1051 ms	2396 KiB

Main

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
 
#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long,long long>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl
#define pq priority_queue
#define inf 1ll<<60
#define rep(i,a,b) for (ll i=a;i<(b);i++)
#define MP make_pair
#define SZ(x) (int(x.size()))
#define mod 1000000007
#define ALL(x) x.begin(),x.end()
#define endl "\n"
void inc(ll &a,ll b) {a=(a+b)%mod;}
void dec(ll &a,ll b) {a=(a-b+mod)%mod;}
int prod(ll a,ll b) {return ll(a)*ll(b)%mod;}
int lowbit(ll x) {return x&(-x);}
ll p0w(ll base,ll p) {ll ret=1;while(p>0){if (p%2ll==1ll) ret=ret*base%mod;base=base*base%mod;p/=2ll;}return ret;}

const ll maxn=333333;
ll a[maxn],b[maxn];
ll n,m;

ll dv(ll x,ll y){
	return (x+y-1)/y;
}
bool check(ll mid){//returns if the minimum can be met
	ll cnt=0;
	rep(i,1,n+1){
		ll curr=mid;
		if(a[i]>b[i]){
			curr-=min(dv(mid,a[i]),m)*a[i];
			cnt+=min(dv(mid,a[i]),m);
		}
		if(curr>0){
			cnt+=dv(curr,b[i]);
		}
	}
	return cnt<=m*n;
}

signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin>>n>>m;
	rep(i,1,n+1)cin>>a[i];
	rep(i,1,n+1)cin>>b[i];
	
	ll lo=0,hi=1e18;
	while(lo<hi){
		ll mid=(lo+hi)>>1;
		if(check(mid))lo=mid;
		else hi=mid-1;
	}
	
	cout<<lo<<endl;
	return 0;
}

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