This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
vector<pair<int,int>> v;
int n,m;
bool check(int mid){
vector<int> need(n,0);
int left = 0; int tot = 0;
for(int i = 0; i<n && tot <= n*m; i++){
int z = max(v[i].first, v[i].second); // a la clase i, estudio o hi vaig
int k = (mid+z-1)/z; // numero de veces que tengo que estudiar o ir
if(k >= m) tot+=m, need[i] = mid-m * z; // quan em falta per aprobar
else tot+=k; // classes que mhan sobrat
}
for(int i = 0; i<n; i++){
tot += max(0ll,(need[i] + v[i].second - 1)/v[i].second);
}
return tot<=n*m;
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cin>>n>>m;
v.assign(n,{0,0});
for(auto& x : v) cin>>x.first; //a
for(auto& x : v) cin>>x.second; //b
int l = 0; int r = 1e18+6;
while(r > l+1){
int mid = (l+r)/2;
if(check(mid)) l = mid;
else r = mid;
}
cout<<l<<endl;
}
Compilation message (stderr)
Main.cpp: In function 'bool check(long long int)':
Main.cpp:10:6: warning: unused variable 'left' [-Wunused-variable]
10 | int left = 0; int tot = 0;
| ^~~~
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