| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 505950 |
2022-01-11T10:58:55 Z |
pragmatist |
Bomb (IZhO17_bomb) |
C++17 |
|
1000 ms |
105764 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;
int l = 1, r = n;
while(l <= r) {
int e = (l + r) >> 1;
int L = 1, R = m;
bool cur = 0;
while(L <= R) {
int f = (L + R) >> 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];
}
}
bool ok = 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) {
cur = 1;
ans = max(ans, e * f);
L = f + 1;
} else
R = f - 1;
}
if(cur)
l = e + 1;
else
r = e - 1;
}
l = 1, r = m;
while(l <= r) {
int f = (l + r) >> 1;
int L = 1, R = n;
bool cur = 0;
while(L <= R) {
int e = (L + R) >> 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];
}
}
bool ok = 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) {
cur = 1;
ans = max(ans, e * f);
L = e + 1;
} else
R = e - 1;
}
if(cur)
l = f + 1;
else
r = f - 1;
}
if(n <= 100 && m <= 100) {
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;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
332 KB |
Output is correct |
| 2 |
Correct |
0 ms |
444 KB |
Output is correct |
| 3 |
Correct |
8 ms |
16460 KB |
Output is correct |
| 4 |
Correct |
8 ms |
16460 KB |
Output is correct |
| 5 |
Correct |
1 ms |
332 KB |
Output is correct |
| 6 |
Correct |
1 ms |
320 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 |
448 KB |
Output is correct |
| 11 |
Correct |
1 ms |
460 KB |
Output is correct |
| 12 |
Correct |
1 ms |
452 KB |
Output is correct |
| 13 |
Correct |
1 ms |
452 KB |
Output is correct |
| 14 |
Correct |
1 ms |
460 KB |
Output is correct |
| 15 |
Correct |
1 ms |
448 KB |
Output is correct |
| 16 |
Correct |
1 ms |
444 KB |
Output is correct |
| 17 |
Correct |
66 ms |
1100 KB |
Output is correct |
| 18 |
Correct |
70 ms |
1128 KB |
Output is correct |
| 19 |
Correct |
208 ms |
1412 KB |
Output is correct |
| 20 |
Correct |
238 ms |
1416 KB |
Output is correct |
| 21 |
Correct |
49 ms |
972 KB |
Output is correct |
| 22 |
Correct |
137 ms |
1228 KB |
Output is correct |
| 23 |
Correct |
339 ms |
1536 KB |
Output is correct |
| 24 |
Correct |
136 ms |
1228 KB |
Output is correct |
| 25 |
Correct |
348 ms |
1536 KB |
Output is correct |
| 26 |
Correct |
372 ms |
1540 KB |
Output is correct |
| 27 |
Correct |
59 ms |
4740 KB |
Output is correct |
| 28 |
Correct |
70 ms |
5196 KB |
Output is correct |
| 29 |
Incorrect |
94 ms |
6496 KB |
Output isn't correct |
| 30 |
Incorrect |
127 ms |
7964 KB |
Output isn't correct |
| 31 |
Incorrect |
98 ms |
6312 KB |
Output isn't correct |
| 32 |
Incorrect |
111 ms |
7180 KB |
Output isn't correct |
| 33 |
Incorrect |
123 ms |
8404 KB |
Output isn't correct |
| 34 |
Correct |
49 ms |
5424 KB |
Output is correct |
| 35 |
Incorrect |
147 ms |
8296 KB |
Output isn't correct |
| 36 |
Correct |
178 ms |
8636 KB |
Output is correct |
| 37 |
Correct |
1 ms |
444 KB |
Output is correct |
| 38 |
Execution timed out |
1012 ms |
105628 KB |
Time limit exceeded |
| 39 |
Correct |
1 ms |
460 KB |
Output is correct |
| 40 |
Correct |
857 ms |
22116 KB |
Output is correct |
| 41 |
Correct |
1 ms |
460 KB |
Output is correct |
| 42 |
Correct |
372 ms |
1536 KB |
Output is correct |
| 43 |
Execution timed out |
1098 ms |
105576 KB |
Time limit exceeded |
| 44 |
Incorrect |
155 ms |
8372 KB |
Output isn't correct |
| 45 |
Execution timed out |
1039 ms |
105552 KB |
Time limit exceeded |
| 46 |
Execution timed out |
1063 ms |
105616 KB |
Time limit exceeded |
| 47 |
Execution timed out |
1051 ms |
105612 KB |
Time limit exceeded |
| 48 |
Execution timed out |
1024 ms |
105536 KB |
Time limit exceeded |
| 49 |
Execution timed out |
1018 ms |
105548 KB |
Time limit exceeded |
| 50 |
Execution timed out |
1059 ms |
105624 KB |
Time limit exceeded |
| 51 |
Execution timed out |
1026 ms |
105560 KB |
Time limit exceeded |
| 52 |
Execution timed out |
1082 ms |
105568 KB |
Time limit exceeded |
| 53 |
Execution timed out |
1029 ms |
105628 KB |
Time limit exceeded |
| 54 |
Execution timed out |
1014 ms |
105568 KB |
Time limit exceeded |
| 55 |
Execution timed out |
1010 ms |
105572 KB |
Time limit exceeded |
| 56 |
Execution timed out |
1106 ms |
105528 KB |
Time limit exceeded |
| 57 |
Execution timed out |
1029 ms |
105544 KB |
Time limit exceeded |
| 58 |
Execution timed out |
1041 ms |
105568 KB |
Time limit exceeded |
| 59 |
Execution timed out |
1039 ms |
105540 KB |
Time limit exceeded |
| 60 |
Execution timed out |
1057 ms |
105544 KB |
Time limit exceeded |
| 61 |
Execution timed out |
1081 ms |
105556 KB |
Time limit exceeded |
| 62 |
Execution timed out |
1078 ms |
105528 KB |
Time limit exceeded |
| 63 |
Execution timed out |
1043 ms |
105764 KB |
Time limit exceeded |
| 64 |
Execution timed out |
1081 ms |
105680 KB |
Time limit exceeded |
| 65 |
Execution timed out |
1036 ms |
105540 KB |
Time limit exceeded |
| 66 |
Execution timed out |
1098 ms |
105540 KB |
Time limit exceeded |
| 67 |
Execution timed out |
1059 ms |
105572 KB |
Time limit exceeded |
| 68 |
Execution timed out |
1090 ms |
105664 KB |
Time limit exceeded |
| 69 |
Execution timed out |
1058 ms |
105628 KB |
Time limit exceeded |
| 70 |
Execution timed out |
1091 ms |
84372 KB |
Time limit exceeded |
| 71 |
Execution timed out |
1029 ms |
105536 KB |
Time limit exceeded |
| 72 |
Execution timed out |
1036 ms |
105648 KB |
Time limit exceeded |
| 73 |
Execution timed out |
1081 ms |
105624 KB |
Time limit exceeded |
| 74 |
Execution timed out |
1027 ms |
105636 KB |
Time limit exceeded |
| 75 |
Execution timed out |
1054 ms |
105544 KB |
Time limit exceeded |
| 76 |
Execution timed out |
1098 ms |
105528 KB |
Time limit exceeded |
| 77 |
Execution timed out |
1052 ms |
105620 KB |
Time limit exceeded |
| 78 |
Execution timed out |
1038 ms |
105624 KB |
Time limit exceeded |
| 79 |
Execution timed out |
1040 ms |
105544 KB |
Time limit exceeded |
| 80 |
Execution timed out |
1086 ms |
105684 KB |
Time limit exceeded |
| 81 |
Execution timed out |
1090 ms |
105568 KB |
Time limit exceeded |
| 82 |
Execution timed out |
1088 ms |
105592 KB |
Time limit exceeded |
| 83 |
Execution timed out |
1018 ms |
105632 KB |
Time limit exceeded |
| 84 |
Execution timed out |
1061 ms |
105568 KB |
Time limit exceeded |
| 85 |
Execution timed out |
1020 ms |
105476 KB |
Time limit exceeded |
| 86 |
Execution timed out |
1095 ms |
105200 KB |
Time limit exceeded |
| 87 |
Execution timed out |
1030 ms |
104672 KB |
Time limit exceeded |
| 88 |
Execution timed out |
1010 ms |
104908 KB |
Time limit exceeded |
| 89 |
Execution timed out |
1042 ms |
104684 KB |
Time limit exceeded |
| 90 |
Execution timed out |
1093 ms |
83836 KB |
Time limit exceeded |
| 91 |
Execution timed out |
1032 ms |
104772 KB |
Time limit exceeded |
| 92 |
Execution timed out |
1104 ms |
104680 KB |
Time limit exceeded |
| 93 |
Execution timed out |
1075 ms |
104720 KB |
Time limit exceeded |
| 94 |
Execution timed out |
1087 ms |
104736 KB |
Time limit exceeded |
| 95 |
Execution timed out |
1102 ms |
104684 KB |
Time limit exceeded |
| 96 |
Execution timed out |
1042 ms |
104528 KB |
Time limit exceeded |
| 97 |
Execution timed out |
1047 ms |
104444 KB |
Time limit exceeded |
| 98 |
Execution timed out |
1078 ms |
104328 KB |
Time limit exceeded |
| 99 |
Execution timed out |
1097 ms |
104380 KB |
Time limit exceeded |
| 100 |
Execution timed out |
1099 ms |
104384 KB |
Time limit exceeded |
