Submission #886584

#	Time	Username	Problem	Language	Result	Execution time	Memory
886584		dubabuba	Self Study (JOI22_ho_t2)	C++14	100 / 100	335 ms	13332 KiB

Main

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

#define int long long
typedef long long ll;
const int mxn = 3e5 + 10;
const int mxm = 1e9 + 10;
const int inf = 3e18 + 10;
int a[mxn], b[mxn], x[mxn];
int n, m;

void build() {
	for(int i = 0; i < n; i++) {
		a[i] = max(a[i], b[i]);
		x[i] = a[i] * m;
	}
}

int sus(int s, int a) {
	return (s + a - 1) / a;
}

bool can(int MID) {
	int MIN = 0, MAX = 0;
	for(int i = 0; i < n; i++) {
		if(x[i] < MID) MIN += (MID - x[i] + b[i] - 1) / b[i];
		if(x[i] > MID) MAX += min(m, (x[i] - MID) / a[i]);
		MIN = min(MIN, inf);
		MAX = min(MAX, inf);
	}
	return MIN <= MAX;
}

signed main() {
	cin >> n >> m;
	for(int i = 0; i < n; i++)
		cin >> a[i];
	for(int j = 0; j < n; j++)
		cin >> b[j];

	build();

	int L = 1e18 + 10, R = 1e18 + 10;
	for(int i = 0; i < n; i++) 
		L = min(L, x[i]);
	while(R - L > 1) {
		int M = (L + R) / 2;
		if(can(M)) L = M;
		else R = M;
	}

	cout << L << '\n';
	return 0;
}

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