Submission #1086540

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086540		Pacybwoah	Boxes with souvenirs (IOI15_boxes)	C++17	10 / 100	1 ms	444 KiB

boxes

#include "boxes.h"
#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
typedef long long ll;

long long delivery(int N, int K, int L, int p[]) {
    vector<int> vec;
    for(int i = 0; i < N; i++) vec.push_back(p[i]);
    int n = vec.size();
    if(n == 0) return 0;
    int k = K;
    int trips = n / k;
    //if(n % k != 0) trips++;
    auto calc = [&](int l, int r){
        if(l > r) return 0;
        return min(min(vec[r] * 2, (L - vec[l]) * 2), L);
    };
    vector<ll> pre(trips + 1);
    for(int i = 0; i < trips; i++){
        if(i == 0) pre[i] = calc(0, k - 1);
        else pre[i] = pre[i - 1] + calc(i * k, i * k + k - 1);
    }
    ll suf = 0;
    int lnow = trips * k, rnow = n - 1, prenow = trips - 1;
    ll ans = 1e18;
    while(prenow >= 0){
        ans = min(ans, suf + pre[prenow] + calc(lnow, rnow));
        prenow--;
        lnow -= k;
        rnow -= k;
        suf += calc(rnow + 1, rnow + k);
    }
    ans = min(ans, suf + calc(lnow, rnow));
    return ans;
}
// g++ -std=c++17 -o run -Wshadow -Wall -Wextra -fsanitize=undefined -fsanitize=address boxes.cpp grader.cpp

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:11:21: warning: conversion from 'std::vector<int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   11 |     int n = vec.size();
      |             ~~~~~~~~^~

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