Submission #738017

#	Time	Username	Problem	Language	Result	Execution time	Memory
738017		maomao90	Self Study (JOI22_ho_t2)	C++17	100 / 100	267 ms	10912 KiB

Main

// Hallelujah, praise the one who set me free
// Hallelujah, death has lost its grip on me
// You have broken every chain, There's salvation in your name
// Jesus Christ, my living hope
#include <bits/stdc++.h> 
using namespace std;

#define REP(i, s, e) for (int i = (s); i < (e); i++)
#define RREP(i, s, e) for (int i = (s); i >= (e); i--)
template <class T>
inline bool mnto(T& a, T b) {return a > b ? a = b, 1 : 0;}
template <class T>
inline bool mxto(T& a, T b) {return a < b ? a = b, 1: 0;}
typedef long long ll;
typedef long double ld;
#define FI first
#define SE second
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
#define ALL(_a) _a.begin(), _a.end()
#define SZ(_a) (int) _a.size()
#define pb push_back
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<iii> viii;

#ifndef DEBUG
#define cerr if (0) cerr
#endif

const int INF = 1000000005;
const ll LINF = 2000000000000000005ll;
const int MAXN = 300005;

int n, m;
int a[MAXN], b[MAXN];

ll need[MAXN];
bool isPos(ll x) {
    ll ex = 0;
    REP (i, 0, n) {
        need[i] = x;
        if (a[i] <= b[i]) {
            ex += m;
            continue;
        }
        ll use = min((ll) m, (x - 1) / a[i] + 1);
        ex += m - use;
        need[i] = max(0ll, x - use * a[i]);
    }
    REP (i, 0, n) {
        if (need[i] == 0) {
            continue;
        }
        ll use = (need[i] - 1) / b[i] + 1;
        ex -= use;
        if (ex < 0) {
            return 0;
        }
    }
    return ex >= 0;
}

int main() {
#ifndef DEBUG
    ios::sync_with_stdio(0), cin.tie(0);
#endif
    cin >> n >> m;
    REP (i, 0, n) {
        cin >> a[i];
    }
    REP (i, 0, n) {
        cin >> b[i];
    }
    ll lo = 0, hi = LINF, mid;
    while (lo < hi) {
        mid = lo + hi + 1 >> 1;
        if (isPos(mid)) {
            lo = mid;
        } else {
            hi = mid - 1;
        }
    }
    cout << lo << '\n';
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:80:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   80 |         mid = lo + hi + 1 >> 1;
      |               ~~~~~~~~^~~

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