제출 #139078

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
139078		SirCeness	Shortcut (IOI16_shortcut)	C++14	0 / 100	2 ms	376 KiB

shortcut

#include "shortcut.h"
#include <bits/stdc++.h>

#define pb push_back
#define mp make_pair
#define inside sl<=l_&&r<=sr
#define outside r<sl||sr<l_
#define orta ((l_+r)>>1)
#define INF 1000000009
#define mod 1000000007
#define ppair(x); cerr << "(" << x.first << ", " << x.second << ")\n";
#define bas(x) #x << ": " << x << " "
#define prarr(x, n); cerr << #x << ": "; for(int qsd = 0; qsd < n; qsd++) cerr << x[qsd] << " "; cerr << "\n";
#define prarrv(x); cerr << #x << ": "; for(int qsd = 0; qsd < (int)x.size(); qsd++) cerr << x[qsd] << " "; cerr << "\n";
using namespace std;
typedef long long ll;

vector<ll> lmax;
vector<ll> rmax;
vector<ll> prest;
vector<ll> sufst;
ll c;
int n;
vector<int> l, d;
vector<ll> pre;
ll stpre[4000006];
ll stsuf[4000006];

ll dist(int ll, int rr){
	return abs(pre[rr] - pre[ll]);
}

ll getl(int i){
	return max(lmax[i], (ll)d[i]);
}

ll getr(int i){
	return max(rmax[i], (ll)d[i]);
}

void stcpre(int node, int l_, int r){
	if (l_ == r) stpre[node] = prest[l_];
	else {
		int m = orta;
		stcpre(node*2, l_, m);
		stcpre(node*2+1, m+1, r);
		stpre[node] = max(stpre[node*2], stpre[node*2+1]);
	}
}

ll stqpre(int node, int l_, int r, int sl, int sr){
	if (inside) return stpre[node];
	else if (outside) return 0;
	else {
		int m = orta;
		return max(stqpre(node*2, l_, m, sl, sr), stqpre(node*2+1, m+1, r, sl, sr));
	}
}

void stcsuf(int node, int l_, int r){
	if (l_ == r) stsuf[node] = sufst[l_];
	else {
		int m = orta;
		stcsuf(node*2, l_, m);
		stcsuf(node*2+1, m+1, r);
		stsuf[node] = max(stsuf[node*2], stsuf[node*2+1]);
	}
}

ll stqsuf(int node, int l_, int r, int sl, int sr){
	if (inside) return stsuf[node];
	else if (outside) return 0;
	else {
		int m = orta;
		return max(stqsuf(node*2, l_, m, sl, sr), stqsuf(node*2+1, m+1, r, sl, sr));
	}
}

int check(ll val){
	int pl = 0;
	int pr = n-1;
	int islem = 1;
	while (islem){
		islem = 0;
		for (int i = 0; i < n; i++){
			ll rig = d[i] + dist(i, pl) + c + max(getr(pr), stqsuf(1, 0, n-1, max(i, pl)+1, pr) - dist(pr, n-1));
			rig = min(rig, d[i] + rmax[i]);
			
			
			while (pl < pr && rig > val){
				pl++;
				rig = rig = d[i] + dist(i, pl) + c + max(getr(pr), stqsuf(1, 0, n-1, max(i, pl)+1, pr) - dist(pr, n-1));
				rig = min(rig, d[i] + rmax[i]);
				islem = 1;
			}
			
			ll lef = d[i] + dist(i, pr) + c + max(getl(pl), stqpre(1, 0, n-1, pl, min(i, pr)-1) - dist(0, pl));
			lef = min(lef, d[i] + lmax[i]);
			while (pl < pr && lef > val){
				pr--;
				lef = d[i] + dist(i, pr) + c + max(getl(pl), stqpre(1, 0, n-1, pl, min(i, pr)-1) - dist(0, pl));
				lef = min(lef, d[i] + lmax[i]);
				islem = 1;
			}
			if (pl == pr) return 0;
		}
	}
	return 1;
}

ll brute(int pl, int pr){
	ll ans = 0;
	for (int i = 0; i < n-1; i++){
		ll rig = INF;
		if (i < pr) rig = d[i] + dist(i, pl) + c + max(getr(pr), stqsuf(1, 0, n-1, max(i, pl)+1, pr) - dist(pr, n-1));
		rig = min(rig, d[i] + rmax[i]);
		
		ll lef = INF; 
		if (i > pl) lef = d[i] + dist(i, pr) + c + max(getl(pl), stqpre(1, 0, n-1, pl, min(i, pr)-1) - dist(0, pl));
		lef = min(lef, d[i] + lmax[i]);
		ans = max(ans, max(rig, lef));
	}
	return ans;
}

ll find_shortcut(int N, vector<int> L, vector<int> D, int C){
	l = L;
	d = D;
	n = N;
	c = C;
	lmax.pb(0);
	for (int i = 1; i < n; i++){
		lmax.pb(max(lmax[i-1] + l[i-1], (ll)l[i-1] + d[i-1]));
	}
	rmax.resize(n);
	rmax[n-1] = 0;
	for (int i = n-2; i >= 0; i--){
		rmax[i] = max(rmax[i+1] + l[i], (ll)l[i] + d[i+1]);
	}
	pre.pb(0);
	for (int i = 1; i < n; i++){
		pre.pb(pre[i-1] + l[i-1]);
	}
	
	prest.resize(n);
	for (int i = 0; i < n; i++){
		prest[i] = dist(0, i) + d[i];
	}
	
	sufst.resize(n);
	for (int i = n-1; i >= 0; i--) sufst[i] = dist(i, n-1) + d[i];
	
	stcpre(1, 0, n-1);
	stcsuf(1, 0, n-1);
	
	/*ll bas = 0;
	ll son = 1e15+1;
	while (bas < son){
		int m = (bas+son)>>1;
		if (check(m)) son = m;
		else bas = m+1;
	}*/
	
	ll ans = 1000000000000000;
	for (int i = 0; i < n; i++){
		for (int j = i+1; j < n; j++){
			ans = min(ans, brute(i, j));
		}
	}
	
	return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

shortcut.cpp: In function 'int check(ll)':
shortcut.cpp:92:9: warning: operation on 'rig' may be undefined [-Wsequence-point]
     rig = rig = d[i] + dist(i, pl) + c + max(getr(pr), stqsuf(1, 0, n-1, max(i, pl)+1, pr) - dist(pr, n-1));
     ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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