Submission #907634

#	Time	Username	Problem	Language	Result	Execution time	Memory
907634		vjudge1	Self Study (JOI22_ho_t2)	C++17	100 / 100	350 ms	10068 KiB

Main

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

#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define F first
#define S second
#define pb push_back
typedef __int128_t ll;
typedef pair<int, int> pii;
typedef vector<ll> vi;

std::istream& operator>>( std::istream& src, __int128_t& value) {
	long long v;src>>v;
	value = (ll)v;
	return src;
}

int main() {
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);
	ll n,m;cin>>n>>m;
	vi a(n);rep(i,0,n)cin>>a[i];
	vi b(n);rep(i,0,n)cin>>b[i];

	bool eq = true;
	rep(i,0,n)a[i]=max(a[i],b[i]);
	ll worst = 2e18;
	if(m==1){
		rep(i,0,n) worst=min(worst,a[i]);
	}else{
		ll lo = 0;
		ll hi = 2e18;
		while(lo+1<hi){
			ll mid = lo+(hi-lo)/2;
			ll cost = 0;
			rep(i,0,n) {
				ll inclass = (mid+a[i]-1)/a[i];
				if(inclass>m){
					inclass=m;
					ll outclass = (mid-inclass*a[i]+b[i]-1)/b[i];
					cost+=outclass;
				}
				cost+=inclass;
			}
			if(cost<=n*m) lo=mid;
			else hi=mid;
		}
		worst=lo;
	}
	cout<<(long long)worst<<endl;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:27:7: warning: unused variable 'eq' [-Wunused-variable]
   27 |  bool eq = true;
      |       ^~

• Subtask 1: 10 / 10
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 29 / 29
• Subtask 5: 9 / 9