oj.uz

Submission #697228

# Submission time Handle Problem Language Result Execution time Memory
697228 2023-02-09T00:05:51 Z allllekssssa Bomb (IZhO17_bomb) C++14
37 / 100
 1000 ms 54768 KB 
#include<bits/stdc++.h>

using namespace std;

const int maxN = 2600;
int n, m;
int a[maxN][maxN];
int d[maxN][maxN];
int c[maxN][maxN];
string s;

int getDSum(int x1, int y1, int x2, int y2) {
	if (x2 > n || y2 > m) return 0;
	return d[x2][y2] + d[x1 - 1][y1 - 1] - d[x1 - 1][y2] - d[x2][y1 - 1];
}

int getCSum(int x1, int y1, int x2, int y2) {
	x1 = max(x1, 1);
	y1 = max(y1, 1);
	return c[x2][y2] + c[x1 - 1][y1 - 1] - c[x1 - 1][y2] - c[x2][y1 - 1];
}

bool check(int x, int y) {

	for (int i = 1; i<=n; i++) {
		for (int j = 1; j<=m; j++) {
			c[i][j] = 0;
		}
	}
   
   for (int i = 1; i<=n; i++) {
   	 for (int j = 1; j<=m; j++) {
   	 	if (getDSum(i, j, i + x - 1, j + y - 1) == x * y) c[i][j] = 1;
   	 }
   }

   for (int i = 1; i <= n; i++) {
		for (int j = 1; j<=m; j++) {
			c[i][j] += c[i - 1][j] + c[i][j - 1] - c[i - 1][j - 1];
		}
	}

   for (int i = 1; i<=n; i++) {
   	for (int j = 1; j <= m; j++) {
 		  if (a[i][j] && getCSum(i - x + 1, j - y + 1, i, j) == 0) return false;
   	  }
   }

   return true;
}


int heuristic() {
  
   int minW = n;
   int minH = m;

	for (int i = 1; i<=n; i++) {
		int cur = 0;
		for (int j = 1; j<=m; j++) {
			if (a[i][j] == 1) cur++; else {
				if (cur > 0) {
					minH = min(minH, cur);
					cur = 0;
				}
			}
		}

	   if (cur > 0) minH = min(minH, cur);
	}

	for (int j = 1; j<=m; j++) {
		int cur = 0;
		for (int i = 1; i<=n; i++) {
			if (a[i][j] == 1) cur++; else {
				if (cur > 0) {
					minW = min(minW, cur);
					cur = 0;
				}
			}
		}

		if (cur > 0) minW = min(minW, cur);
	}
    
    int ans = 0;
	for (int i = 0; i<minW; i++) {
		for (int j = 0; j<minH; j++) {
           if (check(minW - i, minH -j)) ans = max(ans, (minW - i) * (minH -j));
		}
	}
	return ans;
}


int main() {

	cin >> n >> m;

	for (int i = 1; i <=n; i++) {
		cin >> s;

		for (int j = 0; j < m; j++) {
			a[i][j + 1] = s[j] - '0';
		}
	}

	if (n >= 500 || m >= 500) {
		cout << heuristic() << endl;
		return 0;
	}

	for (int i = 1; i <= n; i++) {
		for (int j = 1; j<=m; j++) {
			d[i][j] = d[i - 1][j] + d[i][j - 1] + a[i][j] - d[i - 1][j - 1];
		}
	}
   
    int ans = 0;
    
    int width = m;
	for (int i = 1; i <=n; i++) {

		while (width > 0 && !check(i, width)) width--;

		ans = max(ans, i * width);
	}
    
    cout << ans << endl;
}

Subtask #1
37.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Incorrect 10 ms 20436 KB Output isn't correct
4 Incorrect 11 ms 20408 KB Output isn't correct
5 Incorrect 1 ms 340 KB Output isn't correct
6 Incorrect 1 ms 212 KB Output isn't correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 560 KB Output is correct
12 Correct 1 ms 432 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 3 ms 1164 KB Output is correct
18 Correct 3 ms 1108 KB Output is correct
19 Correct 5 ms 1536 KB Output is correct
20 Correct 9 ms 1524 KB Output is correct
21 Correct 4 ms 952 KB Output is correct
22 Correct 6 ms 1320 KB Output is correct
23 Correct 9 ms 1620 KB Output is correct
24 Correct 5 ms 1336 KB Output is correct
25 Correct 11 ms 1644 KB Output is correct
26 Correct 8 ms 1620 KB Output is correct
27 Correct 127 ms 4856 KB Output is correct
28 Correct 249 ms 5180 KB Output is correct
29 Correct 322 ms 6572 KB Output is correct
30 Correct 631 ms 7872 KB Output is correct
31 Correct 482 ms 6228 KB Output is correct
32 Correct 481 ms 7144 KB Output is correct
33 Correct 767 ms 8280 KB Output is correct
34 Correct 118 ms 5600 KB Output is correct
35 Correct 581 ms 8252 KB Output is correct
36 Correct 701 ms 8288 KB Output is correct
37 Correct 1 ms 468 KB Output is correct
38 Execution timed out 1006 ms 53616 KB Time limit exceeded
39 Correct 1 ms 468 KB Output is correct
40 Execution timed out 1088 ms 14060 KB Time limit exceeded
41 Correct 1 ms 468 KB Output is correct
42 Correct 12 ms 1620 KB Output is correct
43 Execution timed out 1095 ms 53728 KB Time limit exceeded
44 Correct 922 ms 8304 KB Output is correct
45 Execution timed out 1014 ms 53668 KB Time limit exceeded
46 Execution timed out 1024 ms 53696 KB Time limit exceeded
47 Execution timed out 1027 ms 53780 KB Time limit exceeded
48 Execution timed out 1097 ms 53764 KB Time limit exceeded
49 Execution timed out 1064 ms 53772 KB Time limit exceeded
50 Execution timed out 1030 ms 53716 KB Time limit exceeded
51 Execution timed out 1042 ms 53848 KB Time limit exceeded
52 Execution timed out 1010 ms 53708 KB Time limit exceeded
53 Execution timed out 1081 ms 53772 KB Time limit exceeded
54 Execution timed out 1014 ms 53836 KB Time limit exceeded
55 Execution timed out 1093 ms 53668 KB Time limit exceeded
56 Execution timed out 1016 ms 53452 KB Time limit exceeded
57 Execution timed out 1028 ms 53484 KB Time limit exceeded
58 Execution timed out 1022 ms 53640 KB Time limit exceeded
59 Execution timed out 1018 ms 53456 KB Time limit exceeded
60 Execution timed out 1012 ms 53444 KB Time limit exceeded
61 Execution timed out 1022 ms 53500 KB Time limit exceeded
62 Execution timed out 1010 ms 53388 KB Time limit exceeded
63 Execution timed out 1020 ms 53328 KB Time limit exceeded
64 Execution timed out 1033 ms 53284 KB Time limit exceeded
65 Execution timed out 1043 ms 53244 KB Time limit exceeded
66 Execution timed out 1040 ms 53208 KB Time limit exceeded
67 Execution timed out 1030 ms 54004 KB Time limit exceeded
68 Execution timed out 1022 ms 54504 KB Time limit exceeded
69 Execution timed out 1042 ms 54404 KB Time limit exceeded
70 Execution timed out 1043 ms 42620 KB Time limit exceeded
71 Execution timed out 1096 ms 54320 KB Time limit exceeded
72 Execution timed out 1034 ms 54400 KB Time limit exceeded
73 Execution timed out 1033 ms 54392 KB Time limit exceeded
74 Execution timed out 1104 ms 54384 KB Time limit exceeded
75 Execution timed out 1049 ms 54424 KB Time limit exceeded
76 Execution timed out 1020 ms 54416 KB Time limit exceeded
77 Execution timed out 1082 ms 54444 KB Time limit exceeded
78 Execution timed out 1083 ms 54356 KB Time limit exceeded
79 Execution timed out 1051 ms 54240 KB Time limit exceeded
80 Execution timed out 1025 ms 54236 KB Time limit exceeded
81 Execution timed out 1022 ms 54272 KB Time limit exceeded
82 Execution timed out 1020 ms 54228 KB Time limit exceeded
83 Execution timed out 1085 ms 54296 KB Time limit exceeded
84 Execution timed out 1044 ms 54300 KB Time limit exceeded
85 Execution timed out 1048 ms 54276 KB Time limit exceeded
86 Execution timed out 1012 ms 54304 KB Time limit exceeded
87 Execution timed out 1020 ms 54292 KB Time limit exceeded
88 Execution timed out 1050 ms 54220 KB Time limit exceeded
89 Execution timed out 1022 ms 54276 KB Time limit exceeded
90 Execution timed out 1048 ms 43120 KB Time limit exceeded
91 Execution timed out 1100 ms 54768 KB Time limit exceeded
92 Execution timed out 1029 ms 54544 KB Time limit exceeded
93 Execution timed out 1085 ms 54548 KB Time limit exceeded
94 Execution timed out 1053 ms 54556 KB Time limit exceeded
95 Execution timed out 1035 ms 54556 KB Time limit exceeded
96 Execution timed out 1060 ms 54536 KB Time limit exceeded
97 Execution timed out 1106 ms 54452 KB Time limit exceeded
98 Execution timed out 1028 ms 54476 KB Time limit exceeded
99 Execution timed out 1057 ms 54608 KB Time limit exceeded
100 Execution timed out 1032 ms 54540 KB Time limit exceeded