Submission #241251

#	Time	Username	Problem	Language	Result	Execution time	Memory
241251		crossing0ver	Shortcut (IOI16_shortcut)	C++17	0 / 100	5 ms	384 KiB

shortcut

#include<bits/stdc++.h>
#define ll long long 
#define inf 10000000000
//#include "shortcut.h"
using namespace std;
ll L[100005],R[100005],mxL[100005],mxR[100005],loc[100005],LFT[100005],RGHT[100005];

ll find_shortcut(int n, std::vector<int> l, std::vector<int> d, int c)
{
	for (int i = 1; i < n-1; i++) L[i] = l[i-1], R[i] = l[i-1];
	set<int,greater<int> > g;
	
	for (int i = 0; i < n; i++) {
		if (i == 0) mxL[i] = d[i];
		else 
			mxL[i] = max(1ll*d[i],mxL[i-1] + L[i]);
		if (i != 0) loc[i] = loc[i-1] + L[i];
		if (i == 0) LFT[i] = d[i];
		else 
		LFT[i] = max(*g.begin() + loc[i] + d[i],LFT[i-1]);
		g.insert(d[i] - loc[i]);
	}
	g.clear();
	for (int i = n-1; i > 0; i--) {
		if (i == n-1) mxR[i] = d[i];
		else 
			mxR[i] = max(1ll*d[i],mxR[i+1] + R[i]);
		if (i == n-1) RGHT[i] = d[i];
		else 
		RGHT[i] = max(*g.begin() - loc[i] + d[i],RGHT[i+1]);
		g.insert(d[i] + loc[i]);
	}
	ll ans = inf;
	for (int i = 1; i < n; i++) {
		ll length = 0;
		for (int j = i - 1; j >= 0; j--) {
			 length+= R[j];
			ll localMin = mxR[i] + mxL[j] + min(length,1ll*c); 
		ll smallL = 0;
		for (int k = j+1; k <= i; k++) {
			 smallL += L[k];
			localMin = max(localMin,mxL[j] + d[k] + min(smallL,length + c - smallL));
			if (k != i) localMin = max(localMin,mxR[i] + d[k] + min(smallL + c,length - smallL));
		ll partL = 0;
		for (int e = j; e < k; e++) {
			if (e != j) partL += L[e];
			localMin = max(localMin,d[e] + d[k] + min(smallL - partL, length + c - (smallL - partL)));
		}			
		}
		if (n != 3)
		ans = min(ans,max({localMin,RGHT[i],LFT[j]}));
		else 
		if (localMin == 3) 
		return mxR[1];		
	}
	}
		return ans;
	
    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 14
• Subtask 3: 0 / 8
• Subtask 4: 0 / 7
• Subtask 5: 0 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3