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;
typedef long long ll;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const ll INF=1e18+7;
const int LIM=1e5+7;
ll dp[LIM], dp2[LIM], A[LIM], B[LIM];
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
ll n, m;
cin >> n >> m;
rep(i, n) cin >> A[n-i];
rep(i, n+1) cin >> B[i];
ll ans=0;
rep(i, n+1) ans+=B[i];
rep(i, n+1) ans+=A[i];
rep(i, n+1) m+=A[i]*(ll)i;
rep(i, n+1) m-=B[i]*(ll)i;
if(m<0) {
m*=-1;
rep(i, n+1) swap(A[i], B[i]);
}
rep(i, LIM) dp[i]=INF;
dp[0]=0;
for(ll i=n; i; --i) {
if(m>=LIM/2) {
ll p=m-LIM/2;
p=(p+i-1)/i;
p=min(p, A[i]);
A[i]-=p;
dp[0]+=p;
m-=p*i;
}
}
if(m>=LIM) {
cout << "impossible\n";
return 0;
}
rep(xd, 2) {
for(ll i=1; i<=n; ++i) {
vector<ll>V[i], l(i);
rep(j, LIM) {
ll p=j%i;
while(l[p]<V[p].size() && (j-V[p][l[p]])/i>A[i]) ++l[p];
while(V[p].size()>0 && dp[j]<=dp[V[p].back()]+(j-V[p].back())/i) {
V[p].pop_back();
l[p]=min(l[p], (ll)V[p].size());
}
dp2[j]=dp[j];
if(l[p]<V[p].size()) {
dp2[j]=min(dp2[j], dp[V[p][l[p]]]+(j-V[p][l[p]])/i);
}
V[p].pb(j);
}
rep(j, LIM) dp[j]=dp2[j];
}
rep(i, LIM/2) swap(dp[i], dp[LIM-i]);
rep(i, n) swap(A[i], B[i]);
}
if(dp[m]==INF) {
cout << "impossible\n";
return 0;
}
cout << ans-dp[m] << '\n';
}
Compilation message (stderr)
vault.cpp: In function 'int main()':
vault.cpp:48:15: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
48 | while(l[p]<V[p].size() && (j-V[p][l[p]])/i>A[i]) ++l[p];
vault.cpp:54:12: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
54 | if(l[p]<V[p].size()) {
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