Submission #668853

#	Time	Username	Problem	Language	Result	Execution time	Memory
668853		Astrayt	Boxes with souvenirs (IOI15_boxes)	C++17	35 / 100	1 ms	256 KiB

boxes

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define ll long long
#define pii pair<int,int>
#define All(x) x.begin(), x.end()

ll delivery(int N, int K, int _L, int pos[]){
	ll ans = 0, L = _L;
	vector<ll> lp, rp;
	for(int i = 0; i < N; ++i){
		if(pos[i] != 0 && pos[i] <= L / 2) lp.pb(pos[i]);
		else if(pos[i] > L / 2) rp.pb(pos[i]);
	}
	reverse(All(rp));
	int cur = lp.size() + rp.size();
	for(int i = cur; i > 0; ){
		int k = min(K, i);
		ll ml = 0, mr = 0;
		for(; k; k--){
			ll l, r;
			l = (lp.size() ? lp.back() : -1), r = (rp.size() ? rp.back() : L + 1);
			if(ml == 0 && mr == 0){
				if(l > (L - r)) ml = l, lp.pop_back();
				else mr = (L - r), rp.pop_back();
			}else if(ml && l >= (L - r)) lp.pop_back();
			else if(mr && (L - r) >= l) rp.pop_back();
			else{
				if (ml && 2 * (ml + L - r) < L){
					while(k && lp.size()) lp.pop_back(), k--, i--;
					break;
				}
				else if(ml && r != L + 1){
					mr = L - r;
					rp.pop_back();
				}else if(mr && 2 * (mr + l) < L){
					while(k && rp.size()) rp.pop_back(), k--, i--;
					break;
				}
				else if(mr && l != -1){
					ml = l;
					lp.pop_back();
				}
			}
			i--;
		}
		ans += min(2ll * (ml + mr), 1ll * L);
	}
	return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:16:22: warning: conversion from 'std::vector<long long int>::size_type' {aka 'long unsigned int'} to 'int' may change value [-Wconversion]
   16 |  int cur = lp.size() + rp.size();
      |            ~~~~~~~~~~^~~~~~~~~~~

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