Submission #2529331
Source Code Expand
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.Deque; import java.util.LinkedList; import java.util.StringTokenizer; public class Main { int h, w; char[][] board; public static void main(String args[]) { new Main().run(); } void run() { FastReader sc = new FastReader(); h = sc.nextInt(); w = sc.nextInt(); board = new char[h][w]; for (int i = 0; i < h; i++) { board[i] = sc.next().toCharArray(); } solve(); } void solve() { boolean[][] checkBoard = new boolean[h - 1][w - 1]; for (int i = 0; i < h - 1; i++) { for (int j = 0; j < w - 1; j++) { int count = 0; if (board[i][j] == '#') { count++; } if (board[i + 1][j] == '#') { count++; } if (board[i][j + 1] == '#') { count++; } if (board[i + 1][j + 1] == '#') { count++; } if (count % 2 == 0) { checkBoard[i][j] = true; } } } int[][] field = new int[board.length][board[0].length - 1]; for (int i = 0; i < field[0].length; i++) { int same = 0; int ns = 0; for (int j = 0; j < field.length; j++) { if (board[j][i] == board[j][i + 1]) { field[j][i] = j + 1 - same; ns = j + 1; } else { field[j][i] = j + 1 - ns; same = j + 1; } } } System.out.println(largestRectangle(field, '_')); } int largestRectangle(int[][] field, int blocked) { /* int[][] field = new int[board.length][board[0].length]; for (int i = 0; i < field[0].length; i++) { int count = 0; for (int j = 0; j < field.length; j++) { if (board[j][i] == blocked) { field[j][i] = 0; count = 0; } else { field[j][i] = ++count; } } } */ int maximumArea = Math.max(h, w); for (int i = 0; i < field.length; i++) { Deque<RectPair> stack = new LinkedList<>(); for (int j = 0; j <= field[0].length; j++) { RectPair rp = new RectPair(j < field[0].length ? field[i][j] : 0, j); if (stack.isEmpty()) { stack.push(rp); } else { if (stack.peek().height < rp.height) { stack.push(rp); } else if (stack.peek().height > rp.height) { int target = j; while (!stack.isEmpty() && stack.peek().height >= rp.height) { RectPair pre = stack.pop(); int area = pre.height * (j + 1 - pre.position); maximumArea = Math.max(maximumArea, area); target = pre.position; } rp.position = target; stack.push(rp); } } } } return maximumArea; } /* static int largestRectangle(char[][] board, boolean[][] checkBoard, char blocked) { int[][] field = new int[board.length][board[0].length]; for (int i = 0; i < field[0].length; i++) { int count = 0; for (int j = 0; j < field.length; j++) { if (board[j][i] == blocked) { field[j][i] = 0; count = 0; } else { field[j][i] = ++count; } } } int maximumArea = 0; for (int i = 0; i < board.length; i++) { Deque<RectPair> stack = new LinkedList<>(); for (int j = 0; j <= board[0].length; j++) { RectPair rp = new RectPair(j < board[0].length ? field[i][j] : 0, j); if (stack.isEmpty()) { stack.push(rp); } else { if (stack.peek().height <= rp.height) { stack.push(rp); } if (stack.peek().height > rp.height || ) { int target = j; while (!stack.isEmpty() && stack.peek().height >= rp.height) { RectPair pre = stack.pop(); int startI = i + 1 - pre.height; int startJ = pre.position; boolean flag = true; outer: for (int k = startI; k < i; k++) { for (int l = startJ; l < Math.min(j, board[0].length - 1); l++) { if (!checkBoard[k][l]) { target = l + 1; int area = pre.height * (j - pre.position); System.out.println("rejected: " + startI + " " + i + " " + startJ + " " + j + " " + area); flag = false; break outer; } } } if (flag) { int area = pre.height * (j - pre.position); System.out.println(startI + " " + i + " " + startJ + " " + j + " " + area); maximumArea = Math.max(maximumArea, area); //target = pre.position; } } rp.position = target; stack.push(rp); } } } } return maximumArea; } */ static class RectPair { int height; int position; RectPair(int height, int position) { this.height = height; this.position = position; } } static class FastReader { BufferedReader br; StringTokenizer st; public FastReader() { br = new BufferedReader(new InputStreamReader(System.in)); } String next() { while (st == null || !st.hasMoreElements()) { try { st = new StringTokenizer(br.readLine()); } catch (IOException e) { e.printStackTrace(); } } return st.nextToken(); } int nextInt() { return Integer.parseInt(next()); } long nextLong() { return Long.parseLong(next()); } double nextDouble() { return Double.parseDouble(next()); } String nextLine() { String str = ""; try { str = br.readLine(); } catch (IOException e) { e.printStackTrace(); } return str; } } }
Submission Info
Submission Time | |
---|---|
Task | F - Flip and Rectangles |
User | ynish |
Language | Java8 (OpenJDK 1.8.0) |
Score | 700 |
Code Size | 7958 Byte |
Status | AC |
Exec Time | 468 ms |
Memory | 126624 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 700 / 700 | ||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | sample1.txt, sample2.txt, sample3.txt |
All | sample1.txt, sample2.txt, sample3.txt, 1.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 2.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 3.txt, 30.txt, 31.txt, 32.txt, 33.txt, 34.txt, 4.txt, 5.txt, 6.txt, 7.txt, 8.txt, 9.txt, sample1.txt, sample2.txt, sample3.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
1.txt | AC | 87 ms | 18900 KB |
10.txt | AC | 451 ms | 122052 KB |
11.txt | AC | 362 ms | 69728 KB |
12.txt | AC | 349 ms | 109224 KB |
13.txt | AC | 409 ms | 107396 KB |
14.txt | AC | 408 ms | 108596 KB |
15.txt | AC | 387 ms | 110312 KB |
16.txt | AC | 370 ms | 108100 KB |
17.txt | AC | 375 ms | 113132 KB |
18.txt | AC | 439 ms | 121288 KB |
19.txt | AC | 399 ms | 111860 KB |
2.txt | AC | 75 ms | 19412 KB |
20.txt | AC | 393 ms | 121472 KB |
21.txt | AC | 408 ms | 122564 KB |
22.txt | AC | 402 ms | 117476 KB |
23.txt | AC | 409 ms | 113008 KB |
24.txt | AC | 329 ms | 102092 KB |
25.txt | AC | 326 ms | 107060 KB |
26.txt | AC | 452 ms | 121680 KB |
27.txt | AC | 430 ms | 124012 KB |
28.txt | AC | 440 ms | 115844 KB |
29.txt | AC | 405 ms | 107576 KB |
3.txt | AC | 441 ms | 116220 KB |
30.txt | AC | 406 ms | 110020 KB |
31.txt | AC | 376 ms | 104588 KB |
32.txt | AC | 366 ms | 110824 KB |
33.txt | AC | 375 ms | 109948 KB |
34.txt | AC | 370 ms | 115496 KB |
4.txt | AC | 441 ms | 117752 KB |
5.txt | AC | 84 ms | 19540 KB |
6.txt | AC | 73 ms | 19668 KB |
7.txt | AC | 468 ms | 126624 KB |
8.txt | AC | 456 ms | 123920 KB |
9.txt | AC | 460 ms | 123532 KB |
sample1.txt | AC | 69 ms | 19412 KB |
sample2.txt | AC | 83 ms | 21076 KB |
sample3.txt | AC | 71 ms | 21332 KB |