Submission #140005

#	Time	Username	Problem	Language	Result	Execution time	Memory
140005		babo	Boxes with souvenirs (IOI15_boxes)	C++14	0 / 100	2 ms	376 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>

using namespace std;

static long long sum1[10000010];
static long long sum2[10000010];
static long long gonext[10000010];
long long delivery(int N, int K, int L, int p[]) {
	long long i;
	long long ans=1000000000000000000ll;
	for(i=0;i<N;i++)
	{
		gonext[i]=i;
		sum1[i]=p[i]*2;
		if(i>=K)
			sum1[i]+=sum1[i-K];
	}
	for(i=N-1;i>=0;i--)
	{
		sum2[i]=(L-p[i])*2;
		if(i+K<=N-1)
			sum2[i]+=sum2[i+K];
	}
	for(i=0;i<N;i++)
	{
		if(p[i]>L/2) break;
	}
	int las=i-1;
	for(i=0;i<=las;i++)
	{
		gonext[las-i]=las+1+((K-i-1)%K+K)%K;
	}
	/*for(i=0;i<N;i++)
		printf("%lld ",gonext[i]);
	puts("");*/
	long long temp=L*gonext[0]/K;
	if(gonext[0]<N)
		temp+=sum2[gonext[0]];
	ans=min(ans,temp);
	i=-1;
	//printf("%lld %lld %lld %lld %lld\n",i,0,L*(gonext[i+1]-(i+1)),gonext[i+1]<N?sum2[gonext[i+1]]:-1,temp);
	
	for(i=0;i<N&&p[i]<=L/2;i++)
	{
		long long temp=sum1[i]+L*(gonext[i+1]-(i+1))/K;
		if(gonext[i+1]<N)
			temp+=sum2[gonext[i+1]];
		//printf("%lld %lld %lld %lld %lld\n",i,sum1[i],L*(gonext[i+1]-(i+1)),gonext[i+1]<N?sum2[gonext[i+1]]:-1,temp);
		ans=min(ans,temp);
	}	
    return ans;
}
/*
#include "boxes.h"
#include <stdio.h>
#include <stdlib.h>

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;
}*/

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:29:11: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
  int las=i-1;
          ~^~
boxes.cpp:46:13: warning: declaration of 'temp' shadows a previous local [-Wshadow]
   long long temp=sum1[i]+L*(gonext[i+1]-(i+1))/K;
             ^~~~
boxes.cpp:37:12: note: shadowed declaration is here
  long long temp=L*gonext[0]/K;
            ^~~~

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