제출 #322431

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
322431		Seanliu	The Kingdom of JOIOI (JOI17_joioi)	C++17	60 / 100	2791 ms	262148 KiB

joioi

#include <iostream>
#include <algorithm>
#include <utility>
#include <vector>
#define ericxiao ios_base::sync_with_stdio(0);cin.tie(0);
#define pii pair<int,int>
#define F first
#define S second
using namespace std;

const int maxN = 2e3 + 326, INF = 2e9 + 326;

int N, M, arr[maxN][maxN], cnt[maxN * maxN], sz;
vector<int> lisan;
vector<pii> pos[maxN * maxN];
bool vis[maxN][maxN];

void take(int y, int x, int &mx, int &mn, int d){
	if(d == 0){
		for(int i = y; i >= 0 && !vis[i][x]; i--){
			for(int j = x; j >= 0 && !vis[i][j]; j--){
				vis[i][j] = true;
				cnt[arr[i][j]]--;
				mx = max(mx, arr[i][j]);
				mn = min(mn, arr[i][j]);
			}
		}
	} else if(d == 1){
		for(int i = y; i < N && !vis[i][x]; i++){
			for(int j = x; j >= 0 && !vis[i][j]; j--){
				vis[i][j] = true;
				cnt[arr[i][j]]--;
				mx = max(mx, arr[i][j]);
				mn = min(mn, arr[i][j]);
			}
		}
	} else if(d == 2){
		for(int i = y; i < N && !vis[i][x]; i++){
			for(int j = x; j < M && !vis[i][j]; j++){
				vis[i][j] = true;
				cnt[arr[i][j]]--;
				mx = max(mx, arr[i][j]);
				mn = min(mn, arr[i][j]);
			}
		}
	} else if(d == 3){
		for(int i = y; i >= 0 && !vis[i][x]; i--){
			for(int j = x; j < M && !vis[i][j]; j++){
				vis[i][j] = true;
				cnt[arr[i][j]]--;
				mx = max(mx, arr[i][j]);
				mn = min(mn, arr[i][j]);
			}
		}

	}
}

inline void rot(){
	for(int i = 0; i < sz; i++){
		cnt[i] = 0;
	}
	for(int i = 0; i < N; i++) for(int j = 0; j < M; j++) {
		vis[i][j] = false;
		cnt[arr[i][j]]++;
	}
}

int main(){
	ericxiao;
	cin >> N >> M;
	for(int i = 0; i < N; i++){
		for(int j = 0; j < M; j++){
			cin >> arr[i][j];
			lisan.push_back(arr[i][j]);
		}
	}
	sort(lisan.begin(), lisan.end());
	sz = unique(lisan.begin(), lisan.end()) - lisan.begin();
	for(int i = 0; i < N; i++) for(int j = 0; j < M; j++){
		arr[i][j] = lower_bound(lisan.begin(), lisan.begin() + sz, arr[i][j]) - lisan.begin();
		cnt[arr[i][j]]++;
		pos[arr[i][j]].emplace_back(i, j);
	}
	int ans = lisan[sz - 1] - lisan[0];
	for(int jizz = 0; jizz < 4; jizz++){
		//cout << "in jizz = " << jizz << endl;
		int mx = -INF, mn = INF, f = 0, e = sz - 1;
		for(int i = 0; i < sz; i++){
			//take all of them
			//
			//cout << "i = " << i << ", = " << lisan[i] << endl;
			for(auto [y, x] : pos[i]){
				take(y, x, mx, mn, jizz);
			}
			/*
			for(int y = 0; y < N; y++) for(int x = 0; x < M; x++){
				cout << vis[y][x] << " \n"[x == M - 1];
			}
			*/
			while(f < sz - 1 && !cnt[f]) f++;
			while(e && !cnt[e]) e--;
			if(f == sz || !e) break;
			ans = min(ans, max(lisan[e] - lisan[f], lisan[mx] - lisan[mn]));
			//cout << "ans = " << ans << endl;
		}
		rot();
	}
	cout << ans << endl;
}

• Subtask 1: 15 / 15
• Subtask 2: 45 / 45
• Subtask 3: 0 / 40