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 "boxes.h"
#include<bits/stdc++.h>
using namespace std;
class pont{
public:
int elotte;
int utana;
int hely;
long long vissza;
long long elolrol;
long long hatulrol;
};
vector<pont> p;
long long delivery(int n, int k, int l, int in[]) {
p.resize(n+1);
for(int i=0;i<=n;i++){
p[i].elotte = (i-1+n+1)%(n+1);
p[i].utana = (i+1)%(n+1);
}
p[0].hely=0;
for(int i=1;i<=n;i++){
p[i].hely=in[i-1];
}
long long eddig=0;
for(int i=1;i<=n;i++){
p[i].vissza= min (
p[i].hely, l-p[i].hely
);
//cout << i << ':' << p[i].vissza << '\t';
/*if((i-1)%k==0){
eddig+=p[i].hely+p[i].vissza;
p[i].elolrol=eddig;
} else {
eddig+=p[i].hely-p[p[i].elotte].hely;
p[i].elolrol=eddig+p[i].vissza;
}
cout << i << ' ' << p[i].elolrol << '\n';*/
if(i%k==0){
eddig+=p[i].hely-p[p[i].elotte].hely+p[i].vissza;
p[i].elolrol=eddig;
} else if(i%k==1){
eddig+=p[i].hely;
p[i].elolrol=eddig+p[i].vissza;
} else {
eddig+=p[i].hely-p[p[i].elotte].hely;
p[i].elolrol=eddig+p[i].vissza;
}
//cout << i << ' ' << (n-i-1+k)%k << ' ' << eddig << ' ' << p[i].elolrol << '\n';
}
eddig=0;
p[0].hely=l;
for(int i=n;i>0;i--){
if((n-i+1+k)%k==0){
eddig+=p[p[i].utana].hely-p[i].hely+p[i].vissza;
p[i].hatulrol=eddig;
} else if((n-i+1+k)%k==1){
eddig+=l-p[i].hely;
p[i].hatulrol=eddig+p[i].vissza;
} else {
eddig+=p[p[i].utana].hely-p[i].hely;
p[i].hatulrol=eddig+p[i].vissza;
}
//cout << i << ' ' << (n-i+1+k)%k << ' ' << eddig << ' ' << p[i].hatulrol << '\n';
}
long long mn= LLONG_MAX;
for(int i=0;i<=n;i++){
mn = min(p[i].elolrol+p[p[i].utana].hatulrol,mn);
}
return mn;
}
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