oj.uz

Submission #505722

# Submission time Handle Problem Language Result Execution time Memory
505722 2022-01-11T07:13:59 Z pragmatist Bomb (IZhO17_bomb) C++17
30 / 100
 1000 ms 104408 KB 
#include <bits/stdc++.h>                            
 
#define pb push_back
#define sz(v) (int)v.size()
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define x first
#define y second
#define int long long
#define nl "\n"
 
using namespace std;

typedef long long ll;
typedef pair<long long, long long> pll;
typedef pair <ll, ll> pii;

const int N = (int)1e6 + 7;
const int M = (int)5e6 + 7;
const ll MOD = (ll)1e9 + 7;                    
const int inf = (int)1e9 + 7;
const ll INF = (ll)3e18 + 7;

pii dir[] = {{-1, -1}, {1, 1}, {-1, 1}, {1, -1}};

int n, m;
char c[2501][2501];
int used[2501][2501], w[2501][2501];

int get(int x1, int y1, int x2, int y2) {
	return w[x2][y2] - w[x2][y1-1] - w[x1-1][y2] + w[x1-1][y1-1];
}

void upd(int x1, int y1, int x2, int y2) {
	used[x1][y1]++;
	used[x1][y2+1]--;
	used[x2+1][y1]--;
	used[x2+1][y2+1]++;
}

void solve() {           
	cin >> n >> m;
	for(int i = 1; i <= n; ++i) {
		for(int j = 1; j <= m; ++j) {
			cin >> c[i][j];
			w[i][j] = w[i-1][j] + w[i][j-1] - w[i-1][j-1] + (c[i][j] == '1');
		}
	}
	int ans = inf;
	if(n == 1) {
		int cur = 0;
		for(int i = 1; i <= m; ++i) {
			if(c[1][i] == '1') cur++;
			else {
				if(cur > 0) ans = min(ans, cur);
				cur = 0;
			}
		}
		if(c[1][m] == '1') ans = min(ans, cur);
		cout << ans << nl;		
		return;
	}
	if(m == 1) {
		int cur = 0;
		for(int i = 1; i <= n; ++i) {
			if(c[i][1] == '1') cur++;
			else {
				if(cur > 0) ans = min(ans, cur);
				cur = 0;
			}
		}                                      		
		if(c[n][1] == '1') ans = min(ans, cur);
		cout << ans << nl;		
		return;
	}
	ans = 0;
	for(int e = 1; e <= n; ++e) {
		for(int f = 1; f <= n; ++f) {
			bool ok = 1;
			for(int i = 1; i <= n; ++i) fill(used[i] + 1, used[i] + 1 + m, 0);
			for(int i = 1; i <= n; ++i) {
				for(int j = 1; j <= m; ++j) {
			        if(i + e - 1 > n || j + f - 1 > m) break;
					int x = get(i, j, i + e - 1, j + f - 1);
					if(x == e * f) {
						upd(i, j, i + e - 1, j + f - 1);					
					}					
				}
			}
	        for(int i = 1; i <= n; ++i) {
	        	for(int j = 1; j <= m; ++j) {
	        		used[i][j] += used[i-1][j] + used[i][j-1] - used[i-1][j-1];
	        	}
	        }
			for(int i = 1; i <= n && ok; ++i) {
				for(int j = 1; j <= m && ok; ++j) {
					if(c[i][j] == '1') ok &= (used[i][j] > 0);
				}
			}
			if(ok) {
				ans = max(ans, e * f);
				//cout << e << ' ' << f << nl;
			}
		}
	}
	cout << ans << nl;
}
                
signed main() {                   
	ios_base::sync_with_stdio(NULL);
    cin.tie(0);
    cout.tie(0);
   	int test = 1;
	//cin >> test;
	for(int i = 1; i <= test; ++i) {
        //cout << "Case " << i << ": ";
        solve();
    }
    return 0;
}

Subtask #1
30.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 11 ms 16460 KB Output is correct
4 Correct 9 ms 16460 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 0 ms 332 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 460 KB Output is correct
12 Correct 1 ms 460 KB Output is correct
13 Correct 1 ms 460 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 1 ms 460 KB Output is correct
17 Correct 63 ms 1076 KB Output is correct
18 Correct 72 ms 1128 KB Output is correct
19 Correct 209 ms 1408 KB Output is correct
20 Correct 214 ms 1356 KB Output is correct
21 Correct 53 ms 976 KB Output is correct
22 Correct 149 ms 1228 KB Output is correct
23 Correct 370 ms 1520 KB Output is correct
24 Correct 131 ms 1256 KB Output is correct
25 Correct 342 ms 1524 KB Output is correct
26 Correct 417 ms 1528 KB Output is correct
27 Execution timed out 1084 ms 4556 KB Time limit exceeded
28 Execution timed out 1088 ms 5068 KB Time limit exceeded
29 Execution timed out 1084 ms 6348 KB Time limit exceeded
30 Execution timed out 1100 ms 7756 KB Time limit exceeded
31 Execution timed out 1088 ms 6092 KB Time limit exceeded
32 Execution timed out 1090 ms 6988 KB Time limit exceeded
33 Execution timed out 1064 ms 8140 KB Time limit exceeded
34 Execution timed out 1080 ms 5324 KB Time limit exceeded
35 Execution timed out 1091 ms 8140 KB Time limit exceeded
36 Execution timed out 1091 ms 8140 KB Time limit exceeded
37 Correct 1 ms 460 KB Output is correct
38 Execution timed out 1074 ms 104240 KB Time limit exceeded
39 Correct 1 ms 460 KB Output is correct
40 Execution timed out 1100 ms 21552 KB Time limit exceeded
41 Correct 1 ms 460 KB Output is correct
42 Correct 375 ms 1528 KB Output is correct
43 Execution timed out 1091 ms 104288 KB Time limit exceeded
44 Execution timed out 1099 ms 8140 KB Time limit exceeded
45 Execution timed out 1098 ms 104268 KB Time limit exceeded
46 Execution timed out 1103 ms 104260 KB Time limit exceeded
47 Execution timed out 1092 ms 104260 KB Time limit exceeded
48 Execution timed out 1103 ms 104180 KB Time limit exceeded
49 Execution timed out 1088 ms 104288 KB Time limit exceeded
50 Execution timed out 1089 ms 104200 KB Time limit exceeded
51 Execution timed out 1090 ms 104392 KB Time limit exceeded
52 Execution timed out 1096 ms 104300 KB Time limit exceeded
53 Execution timed out 1095 ms 104216 KB Time limit exceeded
54 Execution timed out 1090 ms 104224 KB Time limit exceeded
55 Execution timed out 1104 ms 104280 KB Time limit exceeded
56 Execution timed out 1097 ms 104296 KB Time limit exceeded
57 Execution timed out 1082 ms 104288 KB Time limit exceeded
58 Execution timed out 1083 ms 104292 KB Time limit exceeded
59 Execution timed out 1100 ms 104256 KB Time limit exceeded
60 Execution timed out 1099 ms 104240 KB Time limit exceeded
61 Execution timed out 1100 ms 104296 KB Time limit exceeded
62 Execution timed out 1101 ms 104200 KB Time limit exceeded
63 Execution timed out 1092 ms 104272 KB Time limit exceeded
64 Execution timed out 1106 ms 104232 KB Time limit exceeded
65 Execution timed out 1106 ms 104188 KB Time limit exceeded
66 Execution timed out 1064 ms 104284 KB Time limit exceeded
67 Execution timed out 1100 ms 104264 KB Time limit exceeded
68 Execution timed out 1093 ms 104212 KB Time limit exceeded
69 Execution timed out 1101 ms 104184 KB Time limit exceeded
70 Execution timed out 1104 ms 83400 KB Time limit exceeded
71 Execution timed out 1102 ms 104212 KB Time limit exceeded
72 Execution timed out 1097 ms 104304 KB Time limit exceeded
73 Execution timed out 1104 ms 104280 KB Time limit exceeded
74 Execution timed out 1101 ms 104240 KB Time limit exceeded
75 Execution timed out 1068 ms 104260 KB Time limit exceeded
76 Execution timed out 1086 ms 104260 KB Time limit exceeded
77 Execution timed out 1094 ms 104296 KB Time limit exceeded
78 Execution timed out 1103 ms 104212 KB Time limit exceeded
79 Execution timed out 1089 ms 104312 KB Time limit exceeded
80 Execution timed out 1092 ms 104260 KB Time limit exceeded
81 Execution timed out 1096 ms 104192 KB Time limit exceeded
82 Execution timed out 1095 ms 104288 KB Time limit exceeded
83 Execution timed out 1095 ms 104276 KB Time limit exceeded
84 Execution timed out 1078 ms 104276 KB Time limit exceeded
85 Execution timed out 1100 ms 104196 KB Time limit exceeded
86 Execution timed out 1100 ms 104240 KB Time limit exceeded
87 Execution timed out 1099 ms 104276 KB Time limit exceeded
88 Execution timed out 1073 ms 104244 KB Time limit exceeded
89 Execution timed out 1091 ms 104300 KB Time limit exceeded
90 Execution timed out 1084 ms 83400 KB Time limit exceeded
91 Execution timed out 1101 ms 104264 KB Time limit exceeded
92 Execution timed out 1092 ms 104236 KB Time limit exceeded
93 Execution timed out 1096 ms 104260 KB Time limit exceeded
94 Execution timed out 1103 ms 104260 KB Time limit exceeded
95 Execution timed out 1095 ms 104180 KB Time limit exceeded
96 Execution timed out 1105 ms 104260 KB Time limit exceeded
97 Execution timed out 1097 ms 104204 KB Time limit exceeded
98 Execution timed out 1100 ms 104216 KB Time limit exceeded
99 Execution timed out 1095 ms 104408 KB Time limit exceeded
100 Execution timed out 1098 ms 104216 KB Time limit exceeded