Submission #668578

#	Time	Username	Problem	Language	Result	Execution time	Memory
668578		alvingogo	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	501 ms	196228 KiB

boxes

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define AquA cin.tie(0);ios_base::sync_with_stdio(0);
#define fs first
#define sc second
#define p_q priority_queue
using namespace std;

long long delivery(int N,int K,int L,int positions[]){
	int n=N,k=K,l=L;
	auto p=positions;
	vector<long long> a,b;
	for(int i=0;i<n;i++){
		if(p[i]<=L/2){
			a.push_back(p[i]);
		}
		else{
			b.push_back(L-p[i]);
		}
	}
	reverse(b.begin(),b.end());
	auto c=a,d=b;
	for(int i=k;i<a.size();i++){
		c[i]+=c[i-k];
	}
	for(int i=k;i<b.size();i++){
		d[i]+=d[i-k];
	}
	long long ms=l;
	if(!a.size()){
		return 2*d.back();
	}
	if(!b.size()){
		return 2*c.back();
	}
	ms=min(ms,2*a.back()+2*b.back());
	long long ans=1e18;
	ans=min(ans,2*c.back()+2*d.back());
	int h=a.size(),u=b.size();
	for(int i=0;i<k;i++){
		//c[h-1]+d[u-1];
		long long e=0;
		if(h-k+i>=0){
			e=2*c[h-k+i];
		}
		long long f=0;
		if(u-i-2>=0){
			f=2*d[u-i-2];
		}
		ans=min(ans,e+f+ms);
	}
	return ans;
}

/*
int main(){

	int p[5]={44,48,59,66,90};
	cout << delivery(5,4,110,p) << "\n";
}
*/

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:23:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |  for(int i=k;i<a.size();i++){
      |              ~^~~~~~~~~
boxes.cpp:26:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |  for(int i=k;i<b.size();i++){
      |              ~^~~~~~~~~
boxes.cpp:39:14: warning: conversion from 'std::vector<long long int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   39 |  int h=a.size(),u=b.size();
      |        ~~~~~~^~
boxes.cpp:39:25: warning: conversion from 'std::vector<long long int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   39 |  int h=a.size(),u=b.size();
      |                   ~~~~~~^~

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