Submission #434895

#	Time	Username	Problem	Language	Result	Execution time	Memory
434895		jeqcho	Boxes with souvenirs (IOI15_boxes)	C++17	20 / 100	1 ms	332 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;

typedef long double ld;
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pair<int,int>> vpi;

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define pb push_back
#define rsz resize
#define sz(x) int(x.size())
#define all(x) begin(x), end(x)
#define fi first
#define se second

int const N=1e7+3;
int cwcnt[N];
int ccwcnt[N];
ll cw[N];
ll ccw[N];

ll delivery(int n, int k, int L, int p1[]) {
	vector<ll>p(n);
	F0R(i,n)p[i]=p1[i];
	cwcnt[0]=k;
	cw[0]=0;
	FOR(i,1,n+1)
	{
		cwcnt[i]=cwcnt[i-1]+1;
		cw[i]=cw[i-1];
		if(cwcnt[i]>k)
		{
			cwcnt[i]=1;
			cw[i]+=p[i-1]*2;
		}
		else
		{
			cw[i]+=(p[i-1]-p[i-2])*2;
		}
	}
	ccwcnt[0]=k;
	ccw[0]=0;
	FOR(i,1,n+1)
	{
		ccwcnt[i]=ccwcnt[i-1]+1;
		ccw[i]=ccw[i-1];
		if(ccwcnt[i]>k)
		{
			ccwcnt[i]=1;
			ccw[i]+=(L-p[n-i])*2;
		}
		else
		{
			ccw[i]+=(p[n-i+1]-p[n-i])*2;
		}
	}
	ll ans=4e18;
	F0R(i,n+1)
	{
		ll cand=cw[i]+ccw[n-i];
		ans=min(ans,cand);
	}
	F0R(i,n+1)
	{
		ll cand=cw[i]+L;
		if(n-i-k>=0)cand+=ccw[n-i-k];
		ans=min(ans,cand);
	}
	return ans;
}

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