| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 524319 |
2022-02-09T04:12:07 Z |
boykut |
Bomb (IZhO17_bomb) |
C++14 |
|
1000 ms |
131076 KB |
#include <bits/stdc++.h>
using namespace std;
const int N = 2555;
int arr[N][N], brr[N][N];
int pref[N][N];
int t[N][N* 4], lazy[N][4 * N];
void push(int X, int v, int vl, int vr) {
if (vl == vr || lazy[X][v] == -1) return;
lazy[X][v << 1] = lazy[X][v];
lazy[X][v << 1 | 1] = lazy[X][v];
int vm = vl + vr >> 1;
t[X][v << 1] = lazy[X][v] * (vm - vl + 1);
t[X][v << 1 | 1] = lazy[X][v] * (vr - vm);
lazy[X][v] = -1;
}
void update(int X, int l, int r, int x, int v, int vl, int vr) {
push(X, v, vl, vr);
if (l > vr || vl > r) return;
if (l <= vl && vr <= r) {
t[X][v] = x * (vr - vl + 1);
lazy[X][v] = x;
return;
}
int vm = vl + vr >> 1;
update(X, l, r, x, v << 1, vl, vm);
update(X, l, r, x, v << 1 | 1, vm + 1, vr);
t[X][v] = t[X][v << 1] + t[X][v << 1 | 1];
}
void update(int X, int l, int r, int x) {
update(X, l, r, x, 1, 0, N - 1);
}
int query(int X, int i, int v, int vl, int vr) {
push(X, v, vl, vr);
if (vl == vr)
return t[X][v];
int vm = vl + vr >> 1, q;
if (i <= vm)
q = query(X, i, v << 1, vl, vm);
else
q = query(X, i, v << 1 | 1, vm + 1, vr);
t[X][v] = t[X][v << 1] + t[X][v << 1 | 1];
return q;
}
int query(int X, int i) {
return query(X, i, 1, 0, N - 1);
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
for (int i = 0; i < N; i++)
for (int j = 0; j < 4 * N; j++)
lazy[i][j] = -1;
int n, m;
cin >> n >> m;
int cnt = 0;
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
char x; cin >> x;
arr[i][j] = x - '0';
if (arr[i][j])
cnt++;
}
}
if (!cnt) {
cout << 0 << '\n';
return 0;
}
if (n * n * n * m * 12 > 1e8) {
int a = 0, b = 0;
for (int i = 0; i < n; i++) {
int cnt = 0;
for (int j = 0; j < m; j++) {
if (arr[i][j] == 1) cnt++;
else {
if (cnt)
a = min(a, cnt);
cnt = 0;
}
}
if (cnt)
a = min(a, cnt);
}
for (int j = 0; j < m; j++) {
int cnt = 0;
for (int i = 0; i < n; i++) {
if (arr[i][j] == 1) cnt++;
else {
if (cnt)
b = min(b, cnt);
cnt = 0;
}
}
if (cnt)
b = min(b, cnt);
}
cout << a * 1ll * b << '\n';
return 0;
}
if (n > m) {
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
brr[i][j] = arr[j][i];
}
}
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
arr[i][j] = brr[i][j];
}
}
swap(n, m);
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
update(i, j, j, arr[i][j]);
pref[i][j] = arr[i][j];
pref[i][j] += (i ? pref[i - 1][j] : 0);
pref[i][j] += (j ? pref[i][j - 1] : 0);
pref[i][j] -= (i && j ? pref[i - 1][j - 1] : 0);
}
}
auto get = [&](int a, int b, int c, int d) ->int {
int s = pref[c][d];
s -= (a ? pref[a - 1][d] : 0);
s -= (b ? pref[c][b - 1] : 0);
s += (a && b ? pref[a - 1][b - 1] : 0);
return s;
};
// brute force
int Q = 2;
auto check = [&](int a, int b) ->int {
for (int i = 0; i + a - 1 < n; i++) {
for (int j = 0; j + b - 1 < m; j++) {
int g = get(i, j, i + a - 1, j + b - 1);
if (g == a * b) {
for (int x = i; x <= i + a - 1; x++) {
update(x, j, j + b - 1, Q);
}
}
}
}
int ok = 1;
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
if (query(i, j) != 0 && query(i, j) != Q)
ok = 0;
}
}
Q++;
return ok;
};
//O(n*n * 12*m * 12*12)
//O(10000 *120 * 144)
//O(1000000)
int ans = 0;
for (int a = 1; a <= n; a++) {
int l = 1, r = m;
while (l < r) {
int b = (l + r + 1) / 2;
if (check(a, b))
l = b;
else
r = b - 1;
}
if (check(a, l))
ans = max(ans, a * l);
}
cout << ans << '\n';
return 0;
}
Compilation message
bomb.cpp: In function 'void push(int, int, int, int)':
bomb.cpp:14:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
14 | int vm = vl + vr >> 1;
| ~~~^~~~
bomb.cpp: In function 'void update(int, int, int, int, int, int, int)':
bomb.cpp:27:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
27 | int vm = vl + vr >> 1;
| ~~~^~~~
bomb.cpp: In function 'int query(int, int, int, int, int)':
bomb.cpp:39:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
39 | int vm = vl + vr >> 1, q;
| ~~~^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
40 ms |
102468 KB |
Output is correct |
| 2 |
Correct |
40 ms |
102604 KB |
Output is correct |
| 3 |
Correct |
57 ms |
112556 KB |
Output is correct |
| 4 |
Correct |
58 ms |
112624 KB |
Output is correct |
| 5 |
Correct |
51 ms |
102572 KB |
Output is correct |
| 6 |
Correct |
45 ms |
102476 KB |
Output is correct |
| 7 |
Correct |
39 ms |
102604 KB |
Output is correct |
| 8 |
Correct |
54 ms |
102936 KB |
Output is correct |
| 9 |
Correct |
45 ms |
102864 KB |
Output is correct |
| 10 |
Correct |
41 ms |
102852 KB |
Output is correct |
| 11 |
Correct |
44 ms |
102980 KB |
Output is correct |
| 12 |
Correct |
42 ms |
102820 KB |
Output is correct |
| 13 |
Correct |
40 ms |
102776 KB |
Output is correct |
| 14 |
Correct |
52 ms |
102848 KB |
Output is correct |
| 15 |
Correct |
44 ms |
102880 KB |
Output is correct |
| 16 |
Correct |
61 ms |
103004 KB |
Output is correct |
| 17 |
Incorrect |
40 ms |
102796 KB |
Output isn't correct |
| 18 |
Incorrect |
39 ms |
102724 KB |
Output isn't correct |
| 19 |
Incorrect |
40 ms |
102860 KB |
Output isn't correct |
| 20 |
Incorrect |
40 ms |
102836 KB |
Output isn't correct |
| 21 |
Incorrect |
40 ms |
102748 KB |
Output isn't correct |
| 22 |
Incorrect |
40 ms |
102748 KB |
Output isn't correct |
| 23 |
Incorrect |
40 ms |
102948 KB |
Output isn't correct |
| 24 |
Incorrect |
40 ms |
102780 KB |
Output isn't correct |
| 25 |
Incorrect |
45 ms |
102828 KB |
Output isn't correct |
| 26 |
Incorrect |
44 ms |
102852 KB |
Output isn't correct |
| 27 |
Incorrect |
43 ms |
103984 KB |
Output isn't correct |
| 28 |
Incorrect |
48 ms |
104080 KB |
Output isn't correct |
| 29 |
Incorrect |
42 ms |
104572 KB |
Output isn't correct |
| 30 |
Execution timed out |
1091 ms |
116000 KB |
Time limit exceeded |
| 31 |
Execution timed out |
1100 ms |
112964 KB |
Time limit exceeded |
| 32 |
Incorrect |
48 ms |
104740 KB |
Output isn't correct |
| 33 |
Execution timed out |
1097 ms |
116660 KB |
Time limit exceeded |
| 34 |
Incorrect |
41 ms |
104268 KB |
Output isn't correct |
| 35 |
Execution timed out |
1101 ms |
116728 KB |
Time limit exceeded |
| 36 |
Execution timed out |
1099 ms |
116764 KB |
Time limit exceeded |
| 37 |
Correct |
49 ms |
102980 KB |
Output is correct |
| 38 |
Incorrect |
135 ms |
131072 KB |
Output isn't correct |
| 39 |
Correct |
48 ms |
102988 KB |
Output is correct |
| 40 |
Runtime error |
164 ms |
131076 KB |
Execution killed with signal 9 |
| 41 |
Correct |
50 ms |
102980 KB |
Output is correct |
| 42 |
Incorrect |
40 ms |
102932 KB |
Output isn't correct |
| 43 |
Incorrect |
129 ms |
131072 KB |
Output isn't correct |
| 44 |
Execution timed out |
1097 ms |
116652 KB |
Time limit exceeded |
| 45 |
Incorrect |
124 ms |
131072 KB |
Output isn't correct |
| 46 |
Incorrect |
125 ms |
131072 KB |
Output isn't correct |
| 47 |
Incorrect |
128 ms |
131072 KB |
Output isn't correct |
| 48 |
Incorrect |
133 ms |
131072 KB |
Output isn't correct |
| 49 |
Incorrect |
124 ms |
131072 KB |
Output isn't correct |
| 50 |
Incorrect |
126 ms |
131072 KB |
Output isn't correct |
| 51 |
Incorrect |
124 ms |
131072 KB |
Output isn't correct |
| 52 |
Incorrect |
127 ms |
131072 KB |
Output isn't correct |
| 53 |
Incorrect |
126 ms |
131072 KB |
Output isn't correct |
| 54 |
Incorrect |
132 ms |
131072 KB |
Output isn't correct |
| 55 |
Incorrect |
124 ms |
131072 KB |
Output isn't correct |
| 56 |
Incorrect |
135 ms |
131072 KB |
Output isn't correct |
| 57 |
Incorrect |
132 ms |
131072 KB |
Output isn't correct |
| 58 |
Incorrect |
129 ms |
131072 KB |
Output isn't correct |
| 59 |
Incorrect |
124 ms |
131072 KB |
Output isn't correct |
| 60 |
Incorrect |
126 ms |
131072 KB |
Output isn't correct |
| 61 |
Incorrect |
124 ms |
131072 KB |
Output isn't correct |
| 62 |
Incorrect |
127 ms |
131072 KB |
Output isn't correct |
| 63 |
Incorrect |
124 ms |
131072 KB |
Output isn't correct |
| 64 |
Incorrect |
125 ms |
131072 KB |
Output isn't correct |
| 65 |
Incorrect |
126 ms |
131072 KB |
Output isn't correct |
| 66 |
Incorrect |
130 ms |
131072 KB |
Output isn't correct |
| 67 |
Incorrect |
122 ms |
131008 KB |
Output isn't correct |
| 68 |
Incorrect |
130 ms |
131072 KB |
Output isn't correct |
| 69 |
Incorrect |
123 ms |
130928 KB |
Output isn't correct |
| 70 |
Incorrect |
100 ms |
122572 KB |
Output isn't correct |
| 71 |
Incorrect |
132 ms |
130912 KB |
Output isn't correct |
| 72 |
Incorrect |
127 ms |
130928 KB |
Output isn't correct |
| 73 |
Incorrect |
127 ms |
130776 KB |
Output isn't correct |
| 74 |
Incorrect |
123 ms |
130788 KB |
Output isn't correct |
| 75 |
Incorrect |
124 ms |
130756 KB |
Output isn't correct |
| 76 |
Incorrect |
125 ms |
130716 KB |
Output isn't correct |
| 77 |
Incorrect |
125 ms |
130644 KB |
Output isn't correct |
| 78 |
Incorrect |
135 ms |
130768 KB |
Output isn't correct |
| 79 |
Incorrect |
138 ms |
130616 KB |
Output isn't correct |
| 80 |
Incorrect |
125 ms |
130640 KB |
Output isn't correct |
| 81 |
Incorrect |
125 ms |
130428 KB |
Output isn't correct |
| 82 |
Incorrect |
131 ms |
130496 KB |
Output isn't correct |
| 83 |
Incorrect |
124 ms |
130448 KB |
Output isn't correct |
| 84 |
Incorrect |
122 ms |
130452 KB |
Output isn't correct |
| 85 |
Incorrect |
122 ms |
130396 KB |
Output isn't correct |
| 86 |
Incorrect |
123 ms |
130368 KB |
Output isn't correct |
| 87 |
Incorrect |
124 ms |
130384 KB |
Output isn't correct |
| 88 |
Incorrect |
123 ms |
130492 KB |
Output isn't correct |
| 89 |
Incorrect |
123 ms |
130244 KB |
Output isn't correct |
| 90 |
Incorrect |
94 ms |
122504 KB |
Output isn't correct |
| 91 |
Incorrect |
131 ms |
130372 KB |
Output isn't correct |
| 92 |
Incorrect |
125 ms |
130156 KB |
Output isn't correct |
| 93 |
Incorrect |
122 ms |
130356 KB |
Output isn't correct |
| 94 |
Incorrect |
149 ms |
129988 KB |
Output isn't correct |
| 95 |
Incorrect |
128 ms |
130168 KB |
Output isn't correct |
| 96 |
Incorrect |
123 ms |
130100 KB |
Output isn't correct |
| 97 |
Incorrect |
123 ms |
129836 KB |
Output isn't correct |
| 98 |
Incorrect |
122 ms |
129908 KB |
Output isn't correct |
| 99 |
Incorrect |
133 ms |
130096 KB |
Output isn't correct |
| 100 |
Incorrect |
125 ms |
129884 KB |
Output isn't correct |
