Submission #693932

#	Time	Username	Problem	Language	Result	Execution time	Memory
693932		T0p_	Boxes with souvenirs (IOI15_boxes)	C++14	0 / 100	1 ms	340 KiB

boxes

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

const int N = 10000000;

long long cw[N+5], ccw[N+5];

long long delivery(int N, int K, int L, int p[])
{
    cw[0] = p[0];
    for (int i=1 ; i<N ; i++)
    {
        cw[i] = cw[i-1];

        if (i % K == 0) cw[i] += 2 * p[i-1];
        
        cw[i] += p[i] - p[i-1];
    }

    ccw[N-1] = L - p[N-1];
    for (int i=N-2 ; i>=0 ; i--)
    {
        ccw[i] = ccw[i+1];

        if ((N - i - 1) % K == 0) ccw[i] += 2 * p[i+1];

        ccw[i] += p[i+1] - p[i];
    }

    long long ans = 1e18;
    for (int i=0 ; i<=N ; i++)
    {
        if (i == 0) ans = min(ans, ccw[0] + L - p[0]);
        else if (i == N) ans = min(ans, cw[N-1] + p[N-1]);
        else ans = min(ans, cw[i-1] + p[i-1] + ccw[i] + p[i]);
    }

    return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:9:24: warning: declaration of 'N' shadows a global declaration [-Wshadow]
    9 | long long delivery(int N, int K, int L, int p[])
      |                    ~~~~^
boxes.cpp:5:11: note: shadowed declaration is here
    5 | const int N = 10000000;
      |           ^

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