Submission #619421

#	Time	Username	Problem	Language	Result	Execution time	Memory
619421		Hazem	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	543 ms	277488 KiB

boxes

#include <bits/stdc++.h>
#define LL long long

using namespace std;

const LL LINF = 1e18;

LL a[10000010],pr[10000010],su[10000010];
vector<LL>vec[2];
LL n,k,L1;

long long delivery(int N, int K, int L, int p[]) {
    
    n = N,k = K;    
    L1 = L;

    for(int i=1;i<=n;i++)
        a[i] = p[i-1];
    
    for(int i=1;i<=n;i++)
        if(i<=k)
            pr[i] = a[i]*2;
        else 
            pr[i] = pr[i-k] + a[i]*2;


    for(int i=n;i>=1;i--)
        if(n-i+1<=k)
            su[i] = (L-a[i])*2;
        else 
            su[i] = su[i+k] + (L-a[i])*2;

    LL ans = min(pr[n],su[1]);
    for(int i=1;i<=n;i++){
        ans = min(ans,pr[i-1]+su[i]);
        ans = min(ans,pr[i-1]+su[i+k]+L);
    }

    return ans;
}   

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:27:15: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   27 |     for(int i=n;i>=1;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