#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< min(3, minW); i++) {
for (int j = 0; j<min(3, 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';
}
}
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];
}
}
if (n * m * (n + m) >= 3e8) {
cout << heuristic() << endl;
return 0;
}
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;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Correct |
1 ms |
560 KB |
Output is correct |
3 |
Correct |
19 ms |
30440 KB |
Output is correct |
4 |
Correct |
19 ms |
30440 KB |
Output is correct |
5 |
Correct |
35 ms |
340 KB |
Output is correct |
6 |
Correct |
6 ms |
340 KB |
Output is correct |
7 |
Correct |
0 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 |
0 ms |
468 KB |
Output is correct |
11 |
Correct |
1 ms |
468 KB |
Output is correct |
12 |
Correct |
1 ms |
468 KB |
Output is correct |
13 |
Correct |
1 ms |
432 KB |
Output is correct |
14 |
Correct |
1 ms |
468 KB |
Output is correct |
15 |
Correct |
1 ms |
436 KB |
Output is correct |
16 |
Correct |
1 ms |
564 KB |
Output is correct |
17 |
Correct |
3 ms |
1108 KB |
Output is correct |
18 |
Correct |
3 ms |
1204 KB |
Output is correct |
19 |
Correct |
6 ms |
1492 KB |
Output is correct |
20 |
Correct |
7 ms |
1460 KB |
Output is correct |
21 |
Correct |
5 ms |
980 KB |
Output is correct |
22 |
Correct |
5 ms |
1236 KB |
Output is correct |
23 |
Correct |
9 ms |
1644 KB |
Output is correct |
24 |
Correct |
5 ms |
1372 KB |
Output is correct |
25 |
Correct |
10 ms |
1644 KB |
Output is correct |
26 |
Correct |
8 ms |
1640 KB |
Output is correct |
27 |
Correct |
126 ms |
4848 KB |
Output is correct |
28 |
Correct |
256 ms |
5180 KB |
Output is correct |
29 |
Correct |
332 ms |
6572 KB |
Output is correct |
30 |
Correct |
631 ms |
7816 KB |
Output is correct |
31 |
Correct |
484 ms |
6208 KB |
Output is correct |
32 |
Correct |
505 ms |
7116 KB |
Output is correct |
33 |
Correct |
772 ms |
8216 KB |
Output is correct |
34 |
Correct |
119 ms |
5604 KB |
Output is correct |
35 |
Correct |
584 ms |
8168 KB |
Output is correct |
36 |
Correct |
686 ms |
8208 KB |
Output is correct |
37 |
Correct |
1 ms |
468 KB |
Output is correct |
38 |
Correct |
711 ms |
77268 KB |
Output is correct |
39 |
Correct |
1 ms |
468 KB |
Output is correct |
40 |
Incorrect |
78 ms |
20120 KB |
Output isn't correct |
41 |
Correct |
1 ms |
468 KB |
Output is correct |
42 |
Correct |
11 ms |
1648 KB |
Output is correct |
43 |
Correct |
738 ms |
77176 KB |
Output is correct |
44 |
Correct |
955 ms |
8216 KB |
Output is correct |
45 |
Incorrect |
558 ms |
77268 KB |
Output isn't correct |
46 |
Correct |
692 ms |
77264 KB |
Output is correct |
47 |
Incorrect |
569 ms |
77276 KB |
Output isn't correct |
48 |
Incorrect |
580 ms |
77240 KB |
Output isn't correct |
49 |
Correct |
749 ms |
77264 KB |
Output is correct |
50 |
Incorrect |
607 ms |
77168 KB |
Output isn't correct |
51 |
Incorrect |
592 ms |
77264 KB |
Output isn't correct |
52 |
Incorrect |
576 ms |
77272 KB |
Output isn't correct |
53 |
Incorrect |
590 ms |
77228 KB |
Output isn't correct |
54 |
Incorrect |
605 ms |
77284 KB |
Output isn't correct |
55 |
Incorrect |
651 ms |
77264 KB |
Output isn't correct |
56 |
Correct |
712 ms |
77276 KB |
Output is correct |
57 |
Incorrect |
636 ms |
77048 KB |
Output isn't correct |
58 |
Incorrect |
699 ms |
77244 KB |
Output isn't correct |
59 |
Incorrect |
636 ms |
77044 KB |
Output isn't correct |
60 |
Correct |
697 ms |
77136 KB |
Output is correct |
61 |
Correct |
776 ms |
77136 KB |
Output is correct |
62 |
Correct |
762 ms |
76624 KB |
Output is correct |
63 |
Correct |
721 ms |
76700 KB |
Output is correct |
64 |
Correct |
647 ms |
76668 KB |
Output is correct |
65 |
Incorrect |
580 ms |
76620 KB |
Output isn't correct |
66 |
Incorrect |
583 ms |
76624 KB |
Output isn't correct |
67 |
Incorrect |
597 ms |
76620 KB |
Output isn't correct |
68 |
Incorrect |
573 ms |
76636 KB |
Output isn't correct |
69 |
Incorrect |
781 ms |
76628 KB |
Output isn't correct |
70 |
Execution timed out |
1085 ms |
61332 KB |
Time limit exceeded |
71 |
Incorrect |
623 ms |
76628 KB |
Output isn't correct |
72 |
Incorrect |
583 ms |
76632 KB |
Output isn't correct |
73 |
Incorrect |
562 ms |
76620 KB |
Output isn't correct |
74 |
Incorrect |
622 ms |
76628 KB |
Output isn't correct |
75 |
Incorrect |
574 ms |
76732 KB |
Output isn't correct |
76 |
Incorrect |
583 ms |
76652 KB |
Output isn't correct |
77 |
Incorrect |
644 ms |
76624 KB |
Output isn't correct |
78 |
Incorrect |
587 ms |
76632 KB |
Output isn't correct |
79 |
Incorrect |
608 ms |
76552 KB |
Output isn't correct |
80 |
Incorrect |
670 ms |
76624 KB |
Output isn't correct |
81 |
Incorrect |
573 ms |
76624 KB |
Output isn't correct |
82 |
Incorrect |
577 ms |
76624 KB |
Output isn't correct |
83 |
Incorrect |
579 ms |
76748 KB |
Output isn't correct |
84 |
Incorrect |
573 ms |
76744 KB |
Output isn't correct |
85 |
Incorrect |
566 ms |
76620 KB |
Output isn't correct |
86 |
Incorrect |
571 ms |
76588 KB |
Output isn't correct |
87 |
Incorrect |
569 ms |
76588 KB |
Output isn't correct |
88 |
Incorrect |
553 ms |
76628 KB |
Output isn't correct |
89 |
Incorrect |
573 ms |
76664 KB |
Output isn't correct |
90 |
Execution timed out |
1100 ms |
61260 KB |
Time limit exceeded |
91 |
Incorrect |
589 ms |
76704 KB |
Output isn't correct |
92 |
Incorrect |
569 ms |
76740 KB |
Output isn't correct |
93 |
Incorrect |
575 ms |
76556 KB |
Output isn't correct |
94 |
Incorrect |
574 ms |
76628 KB |
Output isn't correct |
95 |
Incorrect |
580 ms |
76632 KB |
Output isn't correct |
96 |
Incorrect |
557 ms |
76632 KB |
Output isn't correct |
97 |
Incorrect |
574 ms |
76624 KB |
Output isn't correct |
98 |
Incorrect |
575 ms |
76712 KB |
Output isn't correct |
99 |
Incorrect |
583 ms |
76612 KB |
Output isn't correct |
100 |
Incorrect |
580 ms |
76628 KB |
Output isn't correct |