Submission #530005

#	Time	Username	Problem	Language	Result	Execution time	Memory
530005		Servus2022	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	564 ms	370940 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
#include <stdio.h>
#include <stdlib.h>
using namespace std;
long long din[20000003],v[20000003],dininv[20000003];
long long sol=1e18;
long long delivery(int n, int k, int l, int p[]) {
    int i;
    for (i=1;i<=n;i++)
    {
        v[i]=p[i-1];
    }
    for (i=1;i<=k;i++)
    {
        din[i]=v[i]*2;
    }
    for (i=k+1;i<=n;i++)
    {
        din[i]=2*v[i]+din[i-k];
    }
    for (i=n;i>=n-k+1;i--)
    {
        dininv[i]=2*(l-v[i]);
    }
    for (i=n-k;i>=1;i--)
    {
        dininv[i]=2*(l-v[i])+dininv[i+k];
    }
    for (i=0;i<=n;i++)
    {
        sol=min(sol,din[i]+dininv[i+1]);
    }
    for (i=0;i<=n;i++)
    {
        sol=min(sol,din[i]+dininv[i+k+1]+l);
    }
    return sol;
}
#ifdef HOME
static char _buffer[1024];
static int _currentChar = 0;
static int _charsNumber = 0;
static FILE *_inputFile, *_outputFile;

static inline int _read() {
    if (_charsNumber < 0) {
        exit(1);
    }
    if (!_charsNumber || _currentChar == _charsNumber) {
        _charsNumber = (int)fread(_buffer, sizeof(_buffer[0]), sizeof(_buffer), _inputFile);
        _currentChar = 0;
    }
    if (_charsNumber <= 0) {
        return -1;
    }
    return _buffer[_currentChar++];
}

static inline int _readInt() {
    int c, x, s;
    c = _read();
    while (c <= 32) c = _read();
    x = 0;
    s = 1;
    if (c == '-') {
        s = -1;
        c = _read();
    }
    while (c > 32) {
        x *= 10;
        x += c - '0';
        c = _read();
    }
    if (s < 0) x = -x;
    return x;
}

int main() {
	_inputFile = fopen("boxes.in", "rb");
	_outputFile = fopen("boxes.out", "w");

    int N, K, L, i;
    N = _readInt();
    K = _readInt();
    L = _readInt();

    int *p = (int*)malloc(sizeof(int) * (unsigned int)N);

    for (i = 0; i < N; i++) {
        p[i] = _readInt();
    }

    fprintf(_outputFile, "%lld\n", delivery(N, K, L, p));
    return 0;
}

#endif // HOME

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