Submission #30547

#	Time	Username	Problem	Language	Result	Execution time	Memory
30547		kavun	Boxes with souvenirs (IOI15_boxes)	C++14	35 / 100	3 ms	504 KiB

boxes

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

using namespace std;
long long n,l,k,ans = 1e18, cw[10000010], ccw[10000010], lmid = -1, rmid = -1;


long long delivery(int N, int K, int L, int p[]) {
  n = N;
  k = K;
  for(int i = 0; i < n; i++)
    {
      if(p[i] <= L/2)
	lmid = i;
      if(p[i] > L/2)
	{
	  rmid = i;
	  break;
	}
    }
  for(int i = 0; i < k; i++)
    cw[i] = 2*p[i];
  for(int i = k; i < n; i++)
    cw[i] = cw[i-k] + 2*p[i];
  for(int i = n-1; i >= n-k; i--)
    ccw[i] = 2*(L-p[i]);
  for(int i = n-k-1; i >= 0; i--)
    ccw[i] = ccw[i+k] + 2*(L-p[i]);
  for(int i = 0; i < n; i++)
    {
      if(i + k >= n-1)
	ans = min(ans,cw[i] + L);
      else if(p[i+k] > L/2)
	ans = min(ans,cw[i] + L + 2*ccw[i+k+1]);
    }
  long long ans2 = 0;
  if(lmid > -1)
    ans2 += cw[lmid];
  if(rmid > -1)
    ans2 += ccw[rmid];
  ans = min(ans,ans2);
  if(n == K && lmid > -1 && rmid > -1)
    ans = min(ans,(long long)L);

  return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:24:15: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
   for(int i = k; i < n; i++)
               ^
boxes.cpp:26:16: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
   for(int i = n-1; i >= n-k; i--)
               ~^~
boxes.cpp:28:18: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
   for(int i = n-k-1; i >= 0; i--)
               ~~~^~

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