Submission #1283099

#	Time	Username	Problem	Language	Result	Execution time	Memory
1283099		vibeduck	Self Study (JOI22_ho_t2)	C++20	100 / 100	149 ms	5080 KiB

Main

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

#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define int long long
#define all(x) (x).begin(), (x).end()

typedef long double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<bool>> vvb;
typedef vector<vector<ll>> vvll;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef map<int, int> mii;
typedef unordered_map<int, int> umii;

const int mod = 1e9 + 7;
const int inf = INTMAX_MAX;
const bool tc = false;

struct X {
    long long a, b;
};
inline __int128 ceil_div128(__int128 p, __int128 q) {
    return (p + q - 1) / q;
}
bool ok(vector<X> &v, long long val, long long m) {
    __int128 bal = 0;
    for (int i = 0; i < (int)v.size(); i++) {
        long long a = v[i].a, b = v[i].b;
        long long c = max(a, b);

        __int128 ops = ceil_div128((__int128)val, (__int128)c);
        if (ops <= m) {
            bal += (__int128)m - ops;
            continue;
        }
        __int128 todo = (__int128)val - (__int128)c * (__int128)m;
        __int128 need = ceil_div128(todo, (__int128)b);
        if (bal < need) return false;
        bal -= need;
    }
    return true;
}

inline void solve() {
    int n, m; cin >> n >> m;
    vector<X> v(n);
    for (int i = 0; i < n; i++) cin >> v[i].a;
    for (int i = 0; i < n; i++) cin >> v[i].b;
    sort(v.begin(), v.end(), [](const X& L, const X& R){
        long long cL = max(L.a, L.b), cR = max(R.a, R.b);
        if (cL != cR) return cL > cR;   
        return L.b > R.b;                  
    });

    int lo = 0;
    int hi = 2e18;
    while (hi > lo + 1) {
        int mid = (lo + hi) / 2;
        if (ok(v, mid, m)) lo = mid;
        else hi = mid;
    }
    cout << lo << '\n';
}

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

signed main() {
    ios::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    //setIO();

    int t = 1;
    if (tc) {
        cin >> t;
    }

    while (t--) {
        solve();
    }
}

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:80:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:81:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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