Submission #282279

#	Time	Username	Problem	Language	Result	Execution time	Memory
282279		tinjyu	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	558 ms	294008 KiB

boxes

#include "boxes.h"
#include <iostream>
long long int n,k,l,sum[10000005][2];
using namespace std;
long long delivery(int N, int K, int L, int p[]) {
    
    n=N;
    k=K;
    l=L;
	int mid=n;
    for(int i=0;i<n;i++)
    {
        if(l/2<p[i])
        {
            mid=i;
            break;
        }
    }
    long long tmp=0;
	for(int i=0;i<mid;i++)
	{
		if(i-k>=0)sum[i][0]=sum[i-k][0]+p[i];
		else sum[i][0]=p[i];
	}
	tmp=0;
	for(int i=n-1;i>=mid;i--)
	{
		if(i+k<n)sum[i][1]=sum[i+k][1]+(l-p[i]);
		else sum[i][1]=(l-p[i]);
	}
    long long int ans=sum[mid-1][0]*2+sum[mid][1]*2;
    //cout<<sum[mid-1][0]<<" "<<sum[mid][1]<<" "<<ans<<endl;
    for(int i=mid-1;i>=mid-k && i>=-1;i--)
    {
    	tmp=0;
        if(i>=0)tmp=sum[i][0]*2;
        if(i+k+1<n)tmp+=sum[i+k+1][1]*2;
        //cout<<i<<" "<<sum[i][0]<<" "<<i+k+1<<" "<<sum[i+k+1][1]<<endl;
        tmp+=l;
        ans=min(tmp,ans);
    }
    return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:10:10: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   10 |  int mid=n;
      |          ^
boxes.cpp:26:13: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   26 |  for(int i=n-1;i>=mid;i--)
      |            ~^~

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