Submission #131692

#	Time	Username	Problem	Language	Result	Execution time	Memory
131692		youngyojun	Cultivation (JOI17_cultivation)	C++11	100 / 100	160 ms	2428 KiB

cultivation

#include <bits/stdc++.h>
#define eb emplace_back
#define sz(V) ((int)(V).size())
#define allv(V) ((V).begin()),((V).end())
#define sorv(V) sort(allv(V))
#define univ(V) (V).erase(unique(allv(V)),(V).end())
#define upmin(a,b) (a)=min((a),(b))
#define upmax(a,b) (a)=max((a),(b))
#define INF (0x3f3f3f3f)
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;

const int MAXL = 90055;

vector<int> CHX[305], CHU[305], CHD[305], CHS[305];
int DU[MAXL], DD[MAXL], DS[MAXL];

vector<int> HLX, BulX, XV;
int A[305], B[305];

int H, W, N, K, L, Ans = INF*2;

void makeChain(vector<pii> &EV, vector<int> &X, vector<int> &U, vector<int> &D, vector<int> &S) {
	sorv(EV);
	multiset<int> YV, DV;
	YV.insert(0); YV.insert(H+1);
	DV.insert(H+1);
	for(int s = 0, e, n = sz(EV), px; s < n; s = e) {
		px = EV[s].first;
		for(e = s+1; e < n && EV[e].first == px; e++);
		for(int oi = s, y; oi < e; oi++) {
			y = EV[oi].second;
			auto it = YV.insert(y);
			if(YV.begin() != it && YV.end() != next(it))
				DV.erase(DV.find(*next(it) - *prev(it)));
			if(YV.begin() != it) DV.insert(y - *prev(it));
			if(YV.end() != next(it)) DV.insert(*next(it) - y);
		}
		X.eb(px);
		S.eb(*prev(DV.end())-1);
		U.eb(*next(YV.begin())-1);
		D.eb(H-*prev(prev(YV.end())));
	}
}

int main() {
	ios::sync_with_stdio(false);

	cin >> H >> W >> N;
	for(int i = 1; i <= N; i++) {
		cin >> A[i] >> B[i];
		HLX.eb(B[i]-1);
		if(1 < B[i]) BulX.eb(B[i]-1);
	}
	sorv(HLX); univ(HLX);
	sorv(BulX); univ(BulX);

	K = sz(BulX); BulX.eb(W);
	for(int idx = 0, x; idx <= K; idx++) {
		x = BulX[idx];
		vector<pii> EV;
		for(int i = 1, t; i <= N; i++) {
			t = x - B[i];
			if(0 <= t) {
				EV.eb(t, A[i]);
				XV.eb(t);
			}
		}
		makeChain(EV, CHX[idx], CHU[idx], CHD[idx], CHS[idx]);
	}

	sorv(XV); univ(XV); L = sz(XV);
	for(int hlxi = sz(HLX), buli = K-1, lx; hlxi--;) {
		lx = HLX[hlxi];
		for(; 0 <= buli && lx < BulX[buli]; buli--) {
			for(int i = 0, j = 0, n = sz(CHX[buli]), x; i < L; i++) {
				x = XV[i];
				if(j < n && CHX[buli][j] <= x) j++;
				if(j) {
					upmax(DU[i], CHU[buli][j-1]);
					upmax(DD[i], CHD[buli][j-1]);
					upmax(DS[i], CHS[buli][j-1]);
				} else DU[i] = DD[i] = DS[i] = INF;
			}
		}
		for(int i = 0, j = 0, n = sz(CHX[K]), rx, du, dd, ds; i < L || j < n;) {
			rx = INF;
			if(i < L) rx = XV[i]-lx;
			if(j < n) upmin(rx, CHX[K][j]);
			if(rx < 0) { i++; continue; }
			if(i < L && XV[i]-lx == rx) i++;
			if(j < n && CHX[K][j] == rx) j++;
			if(!i || !j) continue;
			du = max(DU[i-1], CHU[K][j-1]);
			dd = max(DD[i-1], CHD[K][j-1]);
			ds = max(DS[i-1], CHS[K][j-1]);
			ll ret = ll(max(ds, du + dd)) + lx + rx;
			if(ret < Ans) Ans = ret;
		}
	}

	cout << Ans << endl;
	return 0;
}

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