oj.uz

Submission #907288

# Submission time Handle Problem Language Result Execution time Memory
907288 2024-01-15T10:54:17 Z daoquanglinh2007 Bomb (IZhO17_bomb) C++17
0 / 100
 3 ms 600 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(){
	freopen("BOMB.inp", "r", stdin);
	freopen("BOMB.ans", "w", stdout);
	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--;
			if (i*j <= ans) break;
		}
		if (i*j <= ans) break;
		ans = i*j;
	}
	cout << ans;
	return 0;
}

Compilation message

bomb.cpp: In function 'int main()':
bomb.cpp:34:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  freopen("BOMB.inp", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bomb.cpp:35:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |  freopen("BOMB.ans", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 3 ms 348 KB Output isn't correct
2 Incorrect 3 ms 348 KB Output isn't correct
3 Incorrect 2 ms 492 KB Output isn't correct
4 Incorrect 2 ms 344 KB Output isn't correct
5 Incorrect 2 ms 348 KB Output isn't correct
6 Incorrect 2 ms 348 KB Output isn't correct
7 Incorrect 2 ms 348 KB Output isn't correct
8 Incorrect 2 ms 348 KB Output isn't correct
9 Incorrect 2 ms 416 KB Output isn't correct
10 Incorrect 2 ms 348 KB Output isn't correct
11 Incorrect 2 ms 348 KB Output isn't correct
12 Incorrect 2 ms 344 KB Output isn't correct
13 Incorrect 2 ms 600 KB Output isn't correct
14 Incorrect 2 ms 348 KB Output isn't correct
15 Incorrect 2 ms 348 KB Output isn't correct
16 Incorrect 2 ms 348 KB Output isn't correct
17 Incorrect 2 ms 348 KB Output isn't correct
18 Incorrect 2 ms 348 KB Output isn't correct
19 Incorrect 2 ms 348 KB Output isn't correct
20 Incorrect 2 ms 348 KB Output isn't correct
21 Incorrect 2 ms 348 KB Output isn't correct
22 Incorrect 2 ms 348 KB Output isn't correct
23 Incorrect 2 ms 348 KB Output isn't correct
24 Incorrect 2 ms 348 KB Output isn't correct
25 Incorrect 2 ms 348 KB Output isn't correct
26 Incorrect 2 ms 348 KB Output isn't correct
27 Incorrect 2 ms 348 KB Output isn't correct
28 Incorrect 2 ms 348 KB Output isn't correct
29 Incorrect 3 ms 536 KB Output isn't correct
30 Incorrect 2 ms 344 KB Output isn't correct
31 Incorrect 2 ms 348 KB Output isn't correct
32 Incorrect 2 ms 348 KB Output isn't correct
33 Incorrect 2 ms 348 KB Output isn't correct
34 Incorrect 2 ms 348 KB Output isn't correct
35 Incorrect 2 ms 348 KB Output isn't correct
36 Incorrect 2 ms 348 KB Output isn't correct
37 Incorrect 2 ms 536 KB Output isn't correct
38 Incorrect 2 ms 348 KB Output isn't correct
39 Incorrect 2 ms 344 KB Output isn't correct
40 Incorrect 2 ms 348 KB Output isn't correct
41 Incorrect 2 ms 348 KB Output isn't correct
42 Incorrect 2 ms 348 KB Output isn't correct
43 Incorrect 2 ms 344 KB Output isn't correct
44 Incorrect 2 ms 348 KB Output isn't correct
45 Incorrect 2 ms 348 KB Output isn't correct
46 Incorrect 2 ms 348 KB Output isn't correct
47 Incorrect 2 ms 344 KB Output isn't correct
48 Incorrect 2 ms 348 KB Output isn't correct
49 Incorrect 2 ms 348 KB Output isn't correct
50 Incorrect 2 ms 348 KB Output isn't correct
51 Incorrect 2 ms 348 KB Output isn't correct
52 Incorrect 2 ms 348 KB Output isn't correct
53 Incorrect 3 ms 344 KB Output isn't correct
54 Incorrect 2 ms 528 KB Output isn't correct
55 Incorrect 3 ms 348 KB Output isn't correct
56 Incorrect 2 ms 348 KB Output isn't correct
57 Incorrect 2 ms 348 KB Output isn't correct
58 Incorrect 3 ms 348 KB Output isn't correct
59 Incorrect 2 ms 348 KB Output isn't correct
60 Incorrect 3 ms 344 KB Output isn't correct
61 Incorrect 3 ms 528 KB Output isn't correct
62 Incorrect 2 ms 348 KB Output isn't correct
63 Incorrect 2 ms 348 KB Output isn't correct
64 Incorrect 2 ms 348 KB Output isn't correct
65 Incorrect 2 ms 348 KB Output isn't correct
66 Incorrect 2 ms 348 KB Output isn't correct
67 Incorrect 2 ms 348 KB Output isn't correct
68 Incorrect 2 ms 344 KB Output isn't correct
69 Incorrect 2 ms 344 KB Output isn't correct
70 Incorrect 2 ms 344 KB Output isn't correct
71 Incorrect 2 ms 348 KB Output isn't correct
72 Incorrect 2 ms 348 KB Output isn't correct
73 Incorrect 2 ms 348 KB Output isn't correct
74 Incorrect 2 ms 348 KB Output isn't correct
75 Incorrect 2 ms 348 KB Output isn't correct
76 Incorrect 2 ms 524 KB Output isn't correct
77 Incorrect 2 ms 348 KB Output isn't correct
78 Incorrect 2 ms 348 KB Output isn't correct
79 Incorrect 2 ms 348 KB Output isn't correct
80 Incorrect 2 ms 348 KB Output isn't correct
81 Incorrect 1 ms 348 KB Output isn't correct
82 Incorrect 2 ms 344 KB Output isn't correct
83 Incorrect 2 ms 348 KB Output isn't correct
84 Incorrect 2 ms 348 KB Output isn't correct
85 Incorrect 2 ms 344 KB Output isn't correct
86 Incorrect 2 ms 344 KB Output isn't correct
87 Incorrect 2 ms 348 KB Output isn't correct
88 Incorrect 2 ms 348 KB Output isn't correct
89 Incorrect 2 ms 348 KB Output isn't correct
90 Incorrect 3 ms 348 KB Output isn't correct
91 Incorrect 2 ms 344 KB Output isn't correct
92 Incorrect 2 ms 348 KB Output isn't correct
93 Incorrect 2 ms 344 KB Output isn't correct
94 Incorrect 2 ms 344 KB Output isn't correct
95 Incorrect 2 ms 344 KB Output isn't correct
96 Incorrect 2 ms 348 KB Output isn't correct
97 Incorrect 2 ms 348 KB Output isn't correct
98 Incorrect 2 ms 348 KB Output isn't correct
99 Incorrect 2 ms 348 KB Output isn't correct
100 Incorrect 2 ms 348 KB Output isn't correct