oj.uz

답안 #907298

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
907298 2024-01-15T11:00:31 Z daoquanglinh2007 Bomb (IZhO17_bomb) C++17
41 / 100
 1000 ms 55888 KB 
#include <bits/stdc++.h>
using namespace std;

const int NM = 2500, inf = 1e9+7;

int N, M, f[NM+5][NM+5], dp[NM+5][NM+5], ans = 0, H = +inf, W = +inf;
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;
}

void preprocess(){
	for (int j = 1; j <= M; j++)
		for (int i = 1; i <= N; i++){
			if (a[i][j] == '0') continue;
			int k = i;
			while (k <= N && a[k][j] == '1') k++;
			H = min(H, k-i);
			i = k-1;
		}
	for (int i = 1; i <= N; i++)
		for (int j = 1; j <= M; j++){
			if (a[i][j] == '0') continue;
			int k = j;
			while (k <= M && a[i][k] == '1') k++;
			W = min(W, k-j);
			j = k-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;
		}
	preprocess();
	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 = W;
	for (int i = 1; i <= H; i++){
		int l = 1, r = j;
		while (l <= r){
			int mid = (l+r)/2;
			if (check(i, mid)){
				j = mid;
				l = mid+1;
			}
			else r = mid-1;
		}
		ans = max(ans, i*j);
	}
	cout << ans;
	return 0;
}

Subtask #1
41.0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 10 ms 54456 KB Output is correct
4 Correct 10 ms 54620 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 1 ms 4444 KB Output is correct
8 Correct 1 ms 4440 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4440 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 2 ms 4600 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 2 ms 6488 KB Output is correct
17 Correct 2 ms 8792 KB Output is correct
18 Correct 2 ms 8796 KB Output is correct
19 Correct 3 ms 10844 KB Output is correct
20 Correct 4 ms 10844 KB Output is correct
21 Correct 2 ms 6748 KB Output is correct
22 Correct 2 ms 10844 KB Output is correct
23 Correct 5 ms 10900 KB Output is correct
24 Correct 3 ms 10844 KB Output is correct
25 Correct 4 ms 10844 KB Output is correct
26 Correct 5 ms 11100 KB Output is correct
27 Correct 4 ms 14940 KB Output is correct
28 Correct 12 ms 14940 KB Output is correct
29 Correct 246 ms 14984 KB Output is correct
30 Correct 118 ms 14936 KB Output is correct
31 Correct 100 ms 14984 KB Output is correct
32 Correct 91 ms 14936 KB Output is correct
33 Correct 170 ms 17068 KB Output is correct
34 Correct 11 ms 13404 KB Output is correct
35 Correct 33 ms 16988 KB Output is correct
36 Correct 249 ms 19088 KB Output is correct
37 Correct 2 ms 6492 KB Output is correct
38 Execution timed out 1083 ms 55440 KB Time limit exceeded
39 Correct 1 ms 6488 KB Output is correct
40 Execution timed out 1030 ms 27224 KB Time limit exceeded
41 Correct 2 ms 6492 KB Output is correct
42 Correct 11 ms 10900 KB Output is correct
43 Execution timed out 1070 ms 55460 KB Time limit exceeded
44 Execution timed out 1016 ms 19088 KB Time limit exceeded
45 Execution timed out 1052 ms 55632 KB Time limit exceeded
46 Execution timed out 1012 ms 55632 KB Time limit exceeded
47 Execution timed out 1060 ms 55444 KB Time limit exceeded
48 Execution timed out 1062 ms 55636 KB Time limit exceeded
49 Correct 689 ms 55660 KB Output is correct
50 Execution timed out 1058 ms 55608 KB Time limit exceeded
51 Execution timed out 1056 ms 55456 KB Time limit exceeded
52 Execution timed out 1025 ms 55632 KB Time limit exceeded
53 Execution timed out 1028 ms 55584 KB Time limit exceeded
54 Execution timed out 1031 ms 55888 KB Time limit exceeded
55 Execution timed out 1066 ms 55636 KB Time limit exceeded
56 Execution timed out 1031 ms 55636 KB Time limit exceeded
57 Execution timed out 1027 ms 55632 KB Time limit exceeded
58 Execution timed out 1026 ms 55432 KB Time limit exceeded
59 Execution timed out 1040 ms 55632 KB Time limit exceeded
60 Execution timed out 1020 ms 55632 KB Time limit exceeded
61 Execution timed out 1042 ms 55640 KB Time limit exceeded
62 Execution timed out 1040 ms 55444 KB Time limit exceeded
63 Execution timed out 1010 ms 55636 KB Time limit exceeded
64 Execution timed out 1045 ms 55456 KB Time limit exceeded
65 Execution timed out 1065 ms 55448 KB Time limit exceeded
66 Execution timed out 1038 ms 55640 KB Time limit exceeded
67 Execution timed out 1047 ms 55636 KB Time limit exceeded
68 Execution timed out 1028 ms 55632 KB Time limit exceeded
69 Execution timed out 1078 ms 55636 KB Time limit exceeded
70 Execution timed out 1057 ms 49744 KB Time limit exceeded
71 Execution timed out 1039 ms 55632 KB Time limit exceeded
72 Execution timed out 1025 ms 55632 KB Time limit exceeded
73 Execution timed out 1045 ms 55636 KB Time limit exceeded
74 Execution timed out 1058 ms 55636 KB Time limit exceeded
75 Execution timed out 1102 ms 55644 KB Time limit exceeded
76 Execution timed out 1039 ms 55632 KB Time limit exceeded
77 Execution timed out 1058 ms 55444 KB Time limit exceeded
78 Execution timed out 1081 ms 55444 KB Time limit exceeded
79 Execution timed out 1016 ms 55632 KB Time limit exceeded
80 Execution timed out 1048 ms 55636 KB Time limit exceeded
81 Execution timed out 1072 ms 55528 KB Time limit exceeded
82 Execution timed out 1050 ms 55508 KB Time limit exceeded
83 Execution timed out 1046 ms 55632 KB Time limit exceeded
84 Execution timed out 1008 ms 55636 KB Time limit exceeded
85 Execution timed out 1046 ms 55640 KB Time limit exceeded
86 Execution timed out 1034 ms 55644 KB Time limit exceeded
87 Execution timed out 1042 ms 55620 KB Time limit exceeded
88 Execution timed out 1061 ms 55464 KB Time limit exceeded
89 Execution timed out 1040 ms 55604 KB Time limit exceeded
90 Execution timed out 1032 ms 49744 KB Time limit exceeded
91 Execution timed out 1022 ms 55756 KB Time limit exceeded
92 Execution timed out 1066 ms 55636 KB Time limit exceeded
93 Execution timed out 1039 ms 55608 KB Time limit exceeded
94 Execution timed out 1059 ms 55612 KB Time limit exceeded
95 Execution timed out 1014 ms 55448 KB Time limit exceeded
96 Execution timed out 1055 ms 55452 KB Time limit exceeded
97 Execution timed out 1060 ms 55456 KB Time limit exceeded
98 Execution timed out 1064 ms 55636 KB Time limit exceeded
99 Execution timed out 1036 ms 55424 KB Time limit exceeded
100 Execution timed out 1042 ms 55636 KB Time limit exceeded