Submission #1094472

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094472		stefanopulos	Self Study (JOI22_ho_t2)	C++17	100 / 100	128 ms	11600 KiB

Main

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>
 
using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ldb;
 
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<ldb,ldb> pdd;

#define ff(i,a,b) for(int i = a; i <= b; i++)
#define fb(i,b,a) for(int i = b; i >= a; i--)
#define trav(a,x) for(auto& a : x)
 
#define sz(a) (int)(a).size()
#define fi first
#define se second
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

// os.order_of_key(k) the number of elements in the os less than k
// *os.find_by_order(k)  print the k-th smallest number in os(0-based)

const int mod = 1000000007;
const ll inf = 1e18 + 5;
const int mxN = 300005; 

int n; ll m;
ll A[mxN];
ll B[mxN];

bool check(ll X){

    ll uk = 0;
    ff(i,1,n){
        if(A[i] > B[i]){
            ll a = min(m, (X + A[i] - 1) / A[i]);
            ll Y = max(0ll, X - a * A[i]);
            ll b = (Y + B[i] - 1) / B[i];
            uk += a; uk += b;
        }
        else{
            ll b = (X + B[i] - 1) / B[i];
            uk += b;
        }

        if(uk > 1ll * n * m)return 0;

    }

    return 1;

}

int main(){
    cin.tie(0)->sync_with_stdio(0);

    cin >> n >> m;
    ff(i,1,n)cin >> A[i];
    ff(i,1,n)cin >> B[i];

    ll l = 0, r = inf, ans = 0;
    while(l <= r){
        ll mid = l + (r - l) / 2;
        if(check(mid)){
            ans = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }

    cout << ans << '\n';

    return 0;
}
/*

3 3
19 4 5
2 6 2

2 1
9 7
2 6

5 60000
630510219 369411957 874325200 990002527 567203997
438920902 634940661 593780254 315929832 420627496

4 25
1 2 3 4
1 2 3 4

// probati bojenje sahovski
*/
 
 
 
 
 

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