Submission #593540

#	Time	Username	Problem	Language	Result	Execution time	Memory
593540		welleyth	Self Study (JOI22_ho_t2)	C++17	100 / 100	270 ms	13880 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;

#define int long long
#define mp make_pair
#define pb push_back

#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx2")

constexpr int INF = (int)2e9;
constexpr int N = (int)4e5 + 111;
constexpr int md = (int)1e9+7;
constexpr int mdPower = (int)1e9+7 - 1;
constexpr double eps = 1e-7;

typedef __int128 _uint;
typedef long long ll;

mt19937_64 rnd(time(nullptr));

void add(int& a,int b){
    a += b; if(a >= md) a -= md;
}
void sub(int& a,int b){
    a -= b; while(a < 0) a += md;
}
void add(__int128& a,int b){
    a += b;
}
void sub(__int128& a,int b){
    a -= b;
}

int bpow(int a,int b){
    if(b == 0)
        return 1;
    if(b % 2 == 0){
        int t = bpow(a,b>>1);
        return 1ll*t*t%md;
    }
    return 1ll * a*bpow(a,b-1) % md;
}

int inv(int a){
    return bpow(a,md-2);
}

//int fac[N],invfac[N];
//
//void init(){
//    fac[0] = 1;
//    for(int i = 1; i < N; i++){
//        fac[i] = (fac[i-1] * i) % md;
//    }
//    invfac[N-1] = inv(fac[N-1]);
//    for(int i = N-2; i >= 0; i--){
//        invfac[i] = (invfac[i+1] * (i+1))%md;
//    }
//    return;
//}
//
//int C(int n,int k){
//    if(k > n)
//        return 0;
//    return fac[n] * invfac[k] % md * invfac[n-k] % md;
//}
//
//int A(int n,int k){
//    if(k > n)
//        return 0;
//    return fac[n] * invfac[n-k] % md;
//

int n,m;
int a[N],b[N];
int cur[N];

bool f(int x){
    int free = n*m;
    for(int i = 0; i < n; i++){
        cur[i] = 0;
    }
    for(int i = 0; i < n; i++){
        if(a[i] > b[i]){
            int t = min(m,(x + a[i] - 1)/a[i]);
            free -= t;
            cur[i] += t * a[i];
        }
    }
    for(int i = 0; i < n; i++){
        if(cur[i] >= x)
            continue;
        int t = min(free,((x-cur[i]) + b[i] - 1) / b[i]);
        free -= t;
        cur[i] += t * b[i];
        if(cur[i] < x)
            return false;
    }
    return true;
}

void solve(){
    cin >> n >> m;

    for(int i = 0; i < n; i++){
        cin >> a[i];
    }
    for(int i = 0; i < n; i++){
        cin >> b[i];
    }

    int l = 0, r = (int)2e18;
    while(r - l > 1){
        int mid = (l+r)>>1;
        if(f(mid))
            l = mid;
        else
            r = mid;
    }

    cout << l << "\n";

    return;
}

signed main(){
    ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
    int tests = 1;
//    cin >> tests;
    for(int test = 1; test <= tests; test++){
//        cerr << "test = " << test << "\n";
        solve();
    }
    return 0;
}
/**

**/

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