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Submission #907263

# Submission time Handle Problem Language Result Execution time Memory
907263 2024-01-15T10:28:37 Z daoquanglinh2007 Bomb (IZhO17_bomb) C++17
41 / 100
 1000 ms 58992 KB 
#include <bits/stdc++.h>
using namespace std;

const int NM = 2500;

int N, M, f[NM+5][NM+5], dp[NM+5][NM+5], ans = 0;
char a[NM+5][NM+5];

int getf(int x, int y, int u, int v){
	return f[u][v]-f[x-1][v]-f[u][y-1]+f[x-1][y-1];
}

bool check(int r, int c){
	for (int i = 1; i <= N; i++)
		for (int j = 1; j <= M; j++) dp[i][j] = 0;
	
	for (int i = 1; i+r-1 <= N; i++)
		for (int j = 1; j+c-1 <= M; j++)
			if (getf(i, j, i+r-1, j+c-1) == r*c){
				dp[i][j]++;
				dp[i+r][j]--;
				dp[i][j+c]--;
				dp[i+r][j+c]++;
			}
	for (int i = 1; i <= N; i++)
		for (int j = 1; j <= M; j++){
			dp[i][j] += dp[i-1][j]+dp[i][j-1]-dp[i-1][j-1];
			if (dp[i][j] == 0 && a[i][j] == '1') return 0;
		}
	return 1;
}

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];
			if (a[i][j] == '1') f[i][j] = 1;
		}
	for (int i = 1; i <= N; i++)
		for (int j = 1; j <= M; j++)
			f[i][j] += f[i][j-1]+f[i-1][j]-f[i-1][j-1];
			
	int j = M;
	for (int i = 1; i <= N; i++){
		while (j >= 0 && !check(i, j)) j--;
		ans = max(ans, i*j);
	}
	cout << ans;
	return 0;
}

Subtask #1
41.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4456 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 10 ms 54620 KB Output is correct
4 Correct 11 ms 54916 KB Output is correct
5 Correct 5 ms 4440 KB Output is correct
6 Correct 2 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Correct 2 ms 6668 KB Output is correct
9 Correct 2 ms 6492 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 2 ms 6488 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 2 ms 4444 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 2 ms 8792 KB Output is correct
18 Correct 2 ms 8796 KB Output is correct
19 Correct 4 ms 10844 KB Output is correct
20 Correct 3 ms 10844 KB Output is correct
21 Correct 2 ms 6748 KB Output is correct
22 Correct 3 ms 10844 KB Output is correct
23 Correct 4 ms 10844 KB Output is correct
24 Correct 3 ms 10844 KB Output is correct
25 Correct 5 ms 10844 KB Output is correct
26 Correct 4 ms 10844 KB Output is correct
27 Correct 22 ms 14940 KB Output is correct
28 Correct 33 ms 15020 KB Output is correct
29 Correct 82 ms 15108 KB Output is correct
30 Correct 160 ms 14936 KB Output is correct
31 Correct 113 ms 15348 KB Output is correct
32 Correct 118 ms 14940 KB Output is correct
33 Correct 226 ms 17240 KB Output is correct
34 Correct 19 ms 13404 KB Output is correct
35 Correct 84 ms 17268 KB Output is correct
36 Correct 155 ms 19292 KB Output is correct
37 Correct 2 ms 6488 KB Output is correct
38 Execution timed out 1053 ms 58940 KB Time limit exceeded
39 Correct 1 ms 6488 KB Output is correct
40 Execution timed out 1025 ms 27736 KB Time limit exceeded
41 Correct 2 ms 6488 KB Output is correct
42 Correct 6 ms 10844 KB Output is correct
43 Execution timed out 1071 ms 58964 KB Time limit exceeded
44 Correct 256 ms 19536 KB Output is correct
45 Execution timed out 1032 ms 58872 KB Time limit exceeded
46 Execution timed out 1010 ms 58788 KB Time limit exceeded
47 Execution timed out 1031 ms 58964 KB Time limit exceeded
48 Execution timed out 1055 ms 58964 KB Time limit exceeded
49 Execution timed out 1012 ms 58936 KB Time limit exceeded
50 Execution timed out 1024 ms 58960 KB Time limit exceeded
51 Execution timed out 1049 ms 58776 KB Time limit exceeded
52 Execution timed out 1028 ms 58880 KB Time limit exceeded
53 Execution timed out 1066 ms 58908 KB Time limit exceeded
54 Execution timed out 1031 ms 58964 KB Time limit exceeded
55 Execution timed out 1029 ms 58740 KB Time limit exceeded
56 Execution timed out 1029 ms 58776 KB Time limit exceeded
57 Execution timed out 1018 ms 58960 KB Time limit exceeded
58 Execution timed out 1027 ms 58960 KB Time limit exceeded
59 Execution timed out 1025 ms 58748 KB Time limit exceeded
60 Execution timed out 1045 ms 58860 KB Time limit exceeded
61 Execution timed out 1018 ms 58960 KB Time limit exceeded
62 Execution timed out 1022 ms 58896 KB Time limit exceeded
63 Execution timed out 1031 ms 58748 KB Time limit exceeded
64 Execution timed out 1016 ms 58776 KB Time limit exceeded
65 Execution timed out 1098 ms 58932 KB Time limit exceeded
66 Execution timed out 1066 ms 58964 KB Time limit exceeded
67 Execution timed out 1049 ms 58960 KB Time limit exceeded
68 Execution timed out 1034 ms 58964 KB Time limit exceeded
69 Execution timed out 1060 ms 58744 KB Time limit exceeded
70 Execution timed out 1073 ms 51940 KB Time limit exceeded
71 Execution timed out 1010 ms 58772 KB Time limit exceeded
72 Execution timed out 1071 ms 58964 KB Time limit exceeded
73 Execution timed out 1034 ms 58780 KB Time limit exceeded
74 Execution timed out 1063 ms 58880 KB Time limit exceeded
75 Execution timed out 1047 ms 58780 KB Time limit exceeded
76 Execution timed out 1038 ms 58784 KB Time limit exceeded
77 Execution timed out 1031 ms 58948 KB Time limit exceeded
78 Execution timed out 1081 ms 58756 KB Time limit exceeded
79 Execution timed out 1038 ms 58992 KB Time limit exceeded
80 Execution timed out 1012 ms 58760 KB Time limit exceeded
81 Execution timed out 1033 ms 58764 KB Time limit exceeded
82 Execution timed out 1043 ms 58832 KB Time limit exceeded
83 Execution timed out 1039 ms 58772 KB Time limit exceeded
84 Execution timed out 1012 ms 58748 KB Time limit exceeded
85 Execution timed out 1102 ms 58964 KB Time limit exceeded
86 Execution timed out 1060 ms 58956 KB Time limit exceeded
87 Execution timed out 1012 ms 58876 KB Time limit exceeded
88 Execution timed out 1010 ms 58960 KB Time limit exceeded
89 Execution timed out 1039 ms 58788 KB Time limit exceeded
90 Execution timed out 1044 ms 52056 KB Time limit exceeded
91 Execution timed out 1049 ms 58964 KB Time limit exceeded
92 Execution timed out 1058 ms 58784 KB Time limit exceeded
93 Execution timed out 1092 ms 58944 KB Time limit exceeded
94 Execution timed out 1045 ms 58960 KB Time limit exceeded
95 Execution timed out 1043 ms 58960 KB Time limit exceeded
96 Execution timed out 1050 ms 58956 KB Time limit exceeded
97 Execution timed out 1054 ms 58968 KB Time limit exceeded
98 Execution timed out 1049 ms 58872 KB Time limit exceeded
99 Execution timed out 1038 ms 58964 KB Time limit exceeded
100 Execution timed out 1020 ms 58960 KB Time limit exceeded