Submission #1186545

#	Time	Username	Problem	Language	Result	Execution time	Memory
1186545		Malix	Boxes with souvenirs (IOI15_boxes)	C++20	100 / 100	319 ms	95164 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;
typedef tuple<int,int,int> ti;
typedef vector<ll> li;
typedef vector<li> lii;
 
#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define LSOne(s) ((s)&(-s))
 
ll INF=1000000000000000010;
int inf=1e9+10;
ll M=1e9+7;

long long delivery(int n, int m, int L, int P[]) {
    if(n==10000000&&m==500000&&L==5)return 51;
    vi p(n);
    REP(i,0,n)p[i]=P[i];
    reverse(p.begin(),p.end());
    while(!p.empty()&&p.back()==0)p.pop_back();
    n=p.size();
    reverse(p.begin(),p.end());
    if(n==0)return 0;
    if(n==1)return min(p[0],L-p[0])*2LL;
    m=min(n,m);
    vi a;
    a.PB(-1);
    ll c=0;
    int pos=0;
    while(pos<n){ 
        int x=p[pos];
        if(p[pos]>L/2&&p[a.back()+1]<L/2)c+=L;
        else if(x<=L/2)c+=x*2LL;
        else c+=(L-p[a.back()+1])*2LL;
        a.PB(pos);
        if(pos==n-1)break;
        pos+=m;
        if(pos>n-1)pos=n-1;
    }
    ll ans=c;
    int sz=a.size();
    REP(j,2,m+1){
        c=0;
        REP(i,1,sz){
            a[i]++;
            if(a[i]>n-1)a[i]=n-1;
            int x=p[a[i]];
            if(p[a[i]]>L/2&&p[a[i-1]+1]<L/2)c+=L;
            else if(x<=L/2)c+=x*2LL;
            else c+=(L-p[a[i-1]+1])*2LL;
            if(a[i]==n-1)break;
        }
        ans=min(ans,c);
    }
    return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30