Submission #907384

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
907384	2024-01-15T13:02:42 Z	daoquanglinh2007	Bomb (IZhO17_bomb)	C++17	92 / 100	264 ms	104692 KB

bomb

#include <bits/stdc++.h>
using namespace std;
 
const int NM = 2500, inf = 1e9+7;
 
int N, M, Up[NM+5][NM+5], Down[NM+5][NM+5], Left[NM+5][NM+5], Right[NM+5][NM+5], H = +inf, W = +inf;
int mx[NM+5], ans = 0;
char a[NM+5][NM+5];

void preprocess(){
	for (int i = 1; i <= N; i++)
		for (int j = 1; j <= M; j++)
			if (a[i][j] == '1'){
				Up[i][j] = Up[i-1][j]+1;
				Left[i][j] = Left[i][j-1]+1;
			}
	for (int i = N; i >= 1; i--)
		for (int j = M; j >= 1; j--)
			if (a[i][j] == '1'){
				Down[i][j] = Down[i+1][j]+1;
				Right[i][j] = Right[i][j+1]+1;
				
				H = min(H, Up[i][j]+Down[i][j]-1);
				W = min(W, Left[i][j]+Right[i][j]-1);
			}
			
	for (int i = 1; i <= H; i++) mx[i] = +inf;
}

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	cin >> N >> M;
	for (int i = 1; i <= N; i++)
		for (int j = 1; j <= M; j++)
			cin >> a[i][j];
			
	preprocess();
	for (int i = 1; i <= N; i++)
		for (int j = 1; j <= M; j++){
			if (Down[i][j] == 1){
				int l = -inf, r = +inf;
				for (int k = 1; k <= H; k++){
					if (i-k+1 < 1) continue;
					l = max(l, j-Left[i-k+1][j]+1);
					r = min(r, j+Right[i-k+1][j]-1);
					mx[k] = min(mx[k], r-l+1);
				}
			}
			if (Up[i][j] == 1){
				int l = -inf, r = +inf;
				for (int k = 1; k <= H; k++){
					if (i+k-1 > N) continue;
					l = max(l, j-Left[i+k-1][j]+1);
					r = min(r, j+Right[i+k-1][j]-1);
					mx[k] = min(mx[k], r-l+1);
				}
			}
		}
	for (int i = 1; i <= H; i++) ans = max(ans, i*mx[i]);
	cout << ans;
	return 0;
}

Subtask #1

92.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	348 KB	Output is correct
2	Correct	1 ms	604 KB	Output is correct
3	Correct	21 ms	73308 KB	Output is correct
4	Correct	19 ms	73348 KB	Output is correct
5	Correct	1 ms	348 KB	Output is correct
6	Correct	1 ms	348 KB	Output is correct
7	Incorrect	0 ms	348 KB	Output isn't correct
8	Correct	1 ms	604 KB	Output is correct
9	Correct	1 ms	604 KB	Output is correct
10	Correct	1 ms	604 KB	Output is correct
11	Correct	1 ms	604 KB	Output is correct
12	Correct	1 ms	600 KB	Output is correct
13	Correct	1 ms	604 KB	Output is correct
14	Correct	0 ms	604 KB	Output is correct
15	Correct	0 ms	604 KB	Output is correct
16	Correct	1 ms	604 KB	Output is correct
17	Correct	2 ms	5468 KB	Output is correct
18	Correct	1 ms	3164 KB	Output is correct
19	Correct	2 ms	7516 KB	Output is correct
20	Correct	2 ms	7516 KB	Output is correct
21	Correct	1 ms	860 KB	Output is correct
22	Correct	2 ms	5208 KB	Output is correct
23	Correct	2 ms	7516 KB	Output is correct
24	Correct	2 ms	7512 KB	Output is correct
25	Correct	3 ms	7772 KB	Output is correct
26	Incorrect	3 ms	8024 KB	Output isn't correct
27	Incorrect	6 ms	14168 KB	Output isn't correct
28	Correct	3 ms	7260 KB	Output is correct
29	Correct	6 ms	15708 KB	Output is correct
30	Correct	7 ms	15840 KB	Output is correct
31	Correct	4 ms	9564 KB	Output is correct
32	Correct	5 ms	13916 KB	Output is correct
33	Correct	7 ms	15544 KB	Output is correct
34	Correct	3 ms	7512 KB	Output is correct
35	Correct	4 ms	7516 KB	Output is correct
36	Incorrect	8 ms	19036 KB	Output isn't correct
37	Correct	1 ms	600 KB	Output is correct
38	Correct	264 ms	104692 KB	Output is correct
39	Correct	1 ms	600 KB	Output is correct
40	Correct	31 ms	39260 KB	Output is correct
41	Correct	1 ms	856 KB	Output is correct
42	Correct	2 ms	8028 KB	Output is correct
43	Correct	141 ms	100384 KB	Output is correct
44	Correct	8 ms	17756 KB	Output is correct
45	Correct	176 ms	102620 KB	Output is correct
46	Correct	154 ms	104528 KB	Output is correct
47	Correct	179 ms	102768 KB	Output is correct
48	Correct	118 ms	104532 KB	Output is correct
49	Incorrect	107 ms	104568 KB	Output isn't correct
50	Correct	109 ms	104584 KB	Output is correct
51	Correct	120 ms	104456 KB	Output is correct
52	Correct	115 ms	104572 KB	Output is correct
53	Correct	118 ms	104272 KB	Output is correct
54	Correct	100 ms	89460 KB	Output is correct
55	Correct	104 ms	87156 KB	Output is correct
56	Correct	211 ms	104576 KB	Output is correct
57	Correct	94 ms	78156 KB	Output is correct
58	Correct	97 ms	89892 KB	Output is correct
59	Correct	94 ms	84240 KB	Output is correct
60	Correct	100 ms	95828 KB	Output is correct
61	Incorrect	118 ms	104564 KB	Output isn't correct
62	Incorrect	158 ms	104532 KB	Output isn't correct
63	Incorrect	175 ms	104528 KB	Output isn't correct
64	Correct	100 ms	89936 KB	Output is correct
65	Correct	121 ms	103820 KB	Output is correct
66	Correct	104 ms	101968 KB	Output is correct
67	Correct	108 ms	104568 KB	Output is correct
68	Correct	109 ms	104536 KB	Output is correct
69	Correct	92 ms	75332 KB	Output is correct
70	Correct	60 ms	34980 KB	Output is correct
71	Correct	117 ms	67668 KB	Output is correct
72	Correct	142 ms	75096 KB	Output is correct
73	Correct	138 ms	74276 KB	Output is correct
74	Correct	132 ms	81492 KB	Output is correct
75	Correct	139 ms	85876 KB	Output is correct
76	Correct	141 ms	90356 KB	Output is correct
77	Correct	138 ms	89208 KB	Output is correct
78	Correct	144 ms	90192 KB	Output is correct
79	Correct	72 ms	25168 KB	Output is correct
80	Correct	74 ms	30288 KB	Output is correct
81	Correct	78 ms	31312 KB	Output is correct
82	Correct	143 ms	92532 KB	Output is correct
83	Correct	146 ms	93776 KB	Output is correct
84	Correct	69 ms	11604 KB	Output is correct
85	Correct	126 ms	91476 KB	Output is correct
86	Correct	106 ms	103928 KB	Output is correct
87	Correct	115 ms	91728 KB	Output is correct
88	Correct	145 ms	91564 KB	Output is correct
89	Correct	106 ms	99408 KB	Output is correct
90	Correct	100 ms	74668 KB	Output is correct
91	Correct	121 ms	95312 KB	Output is correct
92	Correct	125 ms	96888 KB	Output is correct
93	Correct	108 ms	103288 KB	Output is correct
94	Correct	107 ms	97664 KB	Output is correct
95	Correct	144 ms	93776 KB	Output is correct
96	Correct	146 ms	93320 KB	Output is correct
97	Correct	115 ms	104056 KB	Output is correct
98	Correct	139 ms	92240 KB	Output is correct
99	Correct	105 ms	96632 KB	Output is correct
100	Correct	105 ms	103036 KB	Output is correct