Submission #1085910

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085910		RiverFlow	Self Study (JOI22_ho_t2)	C++14	100 / 100	137 ms	9044 KiB

Main

#include <bits/stdc++.h>

#define nl "\n"
#define no "NO"
#define yes "YES"
#define fi first
#define se second
#define vec vector
#define task "main"
#define _mp make_pair
#define ii pair<int, int>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define evoid(val) return void(std::cout << val)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)
#define unq(x) sort(all(x)); x.resize(unique(all(x)) - x.begin())

using namespace std;

template<typename U, typename V> bool maxi(U &a, V b) {
    if (a < b) { a = b; return 1; } return 0;
}
template<typename U, typename V> bool mini(U &a, V b) {
    if (a > b) { a = b; return 1; } return 0;
}

const int N = (int)3e5 + 9;
const int mod = (int)1e9 + 7;

void prepare(); void main_code();

int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    const bool MULTITEST = 0; prepare();
    int num_test = 1; if (MULTITEST) cin >> num_test;
    while (num_test--) { main_code(); }
}

void prepare() {};

int a[N], b[N];

void main_code() {
    int n, m; cin >> n >> m;
    for(int i = 1; i <= n; ++i) cin >> a[i];
    for(int i = 1; i <= n; ++i) cin >> b[i];
    long long lb = 1, rb = (long long)1e18, ans = -1;
    while (lb <= rb) {
        long long mid = (lb + rb) >> 1;
        long long r = 0;

        FOR(i, 1, n) {
            r += m;
            if (a[i] <= b[i]) {
                r -= (mid / b[i]) + (mid % b[i] != 0);
            } else {
                // a[i] > b[i]
                if (1LL * a[i] * m >= mid) {
                    r -= (mid / a[i]) + (mid % a[i] != 0);
                } else {
                    r -= m;
                    long long tmp = mid - 1LL * a[i] * m;
                    r -= (tmp / b[i]) + (tmp % b[i] != 0);
                }
            }
            if (r + 1LL * (n - i) * m < 0)
                break ;
        }

        if (r >= 0) {
            ans = mid,
            lb = mid + 1;
        } else {
            rb = mid - 1;
        }
    }
    cout << ans;
}


/*     Let the river flows naturally     */

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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