This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/*****from dust I have come, dust I will be*****/
#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 forn(i,n) for(int i=0;i<n;i++)
int dx[8] = { 1, 0, -1, 0, -1, 1, -1, 1 };
int dy[8] = { 0, 1, 0, -1, -1, 1, 1, -1 };
int ceil_div(int a, int b) {return a % b == 0 ? a / b : a / b + 1;}
const int MOD = 1000000007;
//const int MOD = 998244353;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pbds; // find_by_order, order_of_key
/*
int k = A.order_of_key(p[i].second);
A.erase(A.find_by_order(k));
erase element from pbds multiset
*/
bool ok(vector<int>&a, int n, int v, int target){
forn(i,n){
int x = target / a[i];
//cout <<x<<'\n';
v -= x;
if (v < 0) return false;
}
return (v >= 0);
}
int binary(vector<int>&a, int n, int v){
int l = 0, r = 5 * 1e15;
int ans = 0;
while (l <= r){
int mid = (l + r) / 2;
if (ok(a, n, v, mid)){
ans = mid;
l = mid + 1;
}
else r = mid - 1;
}
return ans;
}
void solve(){
int n, m; cin >> n >> m;
vector<int>a(n); for (auto &t : a) cin >> t;
vector<int>b(n); for (auto &t : b) cin >> t;
cout << binary(a, n, n*m)<<'\n';
}
int32_t main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int t = 1; //cin >>t;
for (int i=1;i<=t;i++){
solve();
}
return 0;
}
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