Submission #410044

#	Time	Username	Problem	Language	Result	Execution time	Memory
410044		robs	Boxes with souvenirs (IOI15_boxes)	C++17	10 / 100	1 ms	332 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
#define debug(args...) fprintf(stderr, args)
#define clli (long long int)
typedef long long int lli;
using namespace std;
const lli maxn = 2e7, INF = 1e18;
lli n, k, m, dp1[maxn], dp2[maxn], ini[maxn], fim[maxn], resp;

long long delivery(int N, int K, int L, int p[])
{
	n = clli N; m = clli L; k = clli K; resp = INF;
	
	for(int x = 0; x < n; x++)
		ini[x] = clli 2*p[x] + ((x >= k)?ini[x-k]:0);
	for(int x = n-1; x >= 0; x--)
		fim[x] = clli 2*(m-p[x]) + ((x+k < n)?ini[x+k]:0);
	
	resp = min(ini[n-1], fim[0]);
	for(int x = 0; x < n-1; x++)
		resp = min(resp, ini[x]+fim[x+1]);
	if(k >= m)	resp = min(resp, m);
	else
	{
		for(int x = 1; x+k < n; x++)
			resp = min(resp, ini[x-1]+m+fim[x+k]);
		resp = min(resp, m+ini[n-k-1]);
		resp = min(resp, m+fim[k]);
	}
	
//	ll ans = min(2*suf[0], 2*pref[N-1]);
//	if(K >= N) ans = min(ans, (ll) L);
//	for(int i = 0; i < N-1; i++) ans = min(ans, 2*suf[i+1] + 2*pref[i]);
//	// achar  volta
//	if(K < N){
//		for(int i = 1; i+K < N; i++ ){
//			ans = min(ans, L + 2*pref[i-1] + 2*suf[i+K]);
//		}
//		ans = min(ans, L + 2*pref[N-K-1]);
//		ans = min(ans, L + 2*suf[K]); // dou a volta, e pego o resto com uma ida do outro lado
//	}

	
//	debug("%d\n",resp);
//	for(int x = 0; x < n; x++)
//		debug("ini[%d] = %d, fim[%d] = %d// %d // %d\n",x,ini[x],x,fim[x],ini[x]+fim[x+1],ini[x-1]+m+fim[x+k]);
	return resp;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:16:15: warning: conversion from 'lli' {aka 'long long int'} to 'int' may change value [-Wconversion]
   16 |  for(int x = n-1; x >= 0; x--)
      |              ~^~

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