Submission #574735

#	Time	Username	Problem	Language	Result	Execution time	Memory
574735		stevancv	Boxes with souvenirs (IOI15_boxes)	C++14	0 / 100	0 ms	212 KiB

boxes

#include <bits/stdc++.h>
#include "boxes.h"
#define ll long long
#define ld long double
#define sp ' '
#define en '\n'
#define smin(a, b) a = min(a, b)
#define smax(a, b) a = max(a, b)
using namespace std;
const int N = 2e5 + 2;
ll delivery(int N, int K, int D, int pos[]) {
    ll n = N;
    ll k = K;
    ll d = D;
    vector<ll> a(n + 2), p(n + 2), s(n + 2);
    for (int i = 1; i <= n; i++) {
        a[i] = pos[i - 1];
    }
    a[n + 1] = d;
    for (int i = 0; i <= n + 1; i++) {
        p[i] = a[i];
        s[i] = d - a[i];
    }
    for (int i = k; i <= n + 1; i++) p[i] += p[i - k];
    for (int i = n - k + 1; i >= 0; i--) s[i] += s[i + k];
    int l = 0, r = n + 1;
    ll ans = 1e18;
    while (l < r) {
        ll kolko = r - l - 1;
        kolko = (kolko + k - 1) / k;
        smin(ans, 2 * (p[l] + s[r]) + kolko * d);
        ll x = 2 * (p[l + 1] - p[l]);
        ll y = 2 * (s[r] - s[r - 1]);
        if (x < y) l++;
        else r--;
    }
    return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:11:17: warning: declaration of 'N' shadows a global declaration [-Wshadow]
   11 | ll delivery(int N, int K, int D, int pos[]) {
      |             ~~~~^
boxes.cpp:10:11: note: shadowed declaration is here
   10 | const int N = 2e5 + 2;
      |           ^
boxes.cpp:24:18: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   24 |     for (int i = k; i <= n + 1; i++) p[i] += p[i - k];
      |                  ^
boxes.cpp:25:24: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   25 |     for (int i = n - k + 1; i >= 0; i--) s[i] += s[i + k];
      |                  ~~~~~~^~~
boxes.cpp:26:22: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   26 |     int l = 0, r = n + 1;
      |                    ~~^~~

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