Submission #118943

#	Time	Username	Problem	Language	Result	Execution time	Memory
118943		oolimry	Boxes with souvenirs (IOI15_boxes)	C++14	50 / 100	74 ms	39724 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;

static long long leftl[10000005];
static long long rightr[10000005];

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

    for(int i = 0;i < n;i++){
        if(i < k) leftl[i] = 2*p[i];
        else leftl[i] = leftl[i-k] + p[i] * 2;
    }
    for(int i = n-1;i >= 0;i--){
        if(i + k >= n) rightr[i] = (l - p[i]) * 2;
        else rightr[i] = rightr[i+k] + (l - p[i]) * 2;
    }

    //for(int i = 0;i < n;i++){
    //    cout << leftl[i] << " " << rightr[i] << "\n";
    //}

    long long circles = n;
    long long ans = min(leftl[n-1], rightr[0]);
    for(int i = -1;i < n;i++){
        long long value = 0;
        if(i != -1) value += leftl[i];

        while(true){
            if(circles == 0) break;

            int pnt2 = i + 1 + k * (circles - 1);
            if(pnt2 >= n){
                circles--;
            }
            else if(L >= 2 * L - 2 * p[pnt2]){
                circles--;
            }
            else{
                break;
            }
        }

        value += circles * l;
        int endpnt = i + 1 + k * circles;
        if(endpnt < n) value += rightr[endpnt];
        //cout << i << " " << circles << "\n";
        ans = min(ans,value);
    }
    return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:16:18: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     for(int i = n-1;i >= 0;i--){
                 ~^~
boxes.cpp:34:30: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
             int pnt2 = i + 1 + k * (circles - 1);
                        ~~~~~~^~~~~~~~~~~~~~~~~~~
boxes.cpp:47:28: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         int endpnt = i + 1 + k * circles;
                      ~~~~~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30