| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 524315 |
2022-02-09T04:08:45 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 * m * n * n > 1e6) {
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 * 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 |
39 ms |
102468 KB |
Output is correct |
| 2 |
Correct |
39 ms |
102528 KB |
Output is correct |
| 3 |
Correct |
61 ms |
112604 KB |
Output is correct |
| 4 |
Correct |
56 ms |
112504 KB |
Output is correct |
| 5 |
Correct |
49 ms |
102512 KB |
Output is correct |
| 6 |
Correct |
43 ms |
102540 KB |
Output is correct |
| 7 |
Correct |
38 ms |
102628 KB |
Output is correct |
| 8 |
Correct |
44 ms |
102884 KB |
Output is correct |
| 9 |
Correct |
46 ms |
102944 KB |
Output is correct |
| 10 |
Correct |
41 ms |
102788 KB |
Output is correct |
| 11 |
Correct |
47 ms |
102976 KB |
Output is correct |
| 12 |
Correct |
40 ms |
102852 KB |
Output is correct |
| 13 |
Correct |
40 ms |
102804 KB |
Output is correct |
| 14 |
Correct |
42 ms |
102876 KB |
Output is correct |
| 15 |
Correct |
45 ms |
102852 KB |
Output is correct |
| 16 |
Correct |
57 ms |
102940 KB |
Output is correct |
| 17 |
Incorrect |
39 ms |
102792 KB |
Output isn't correct |
| 18 |
Incorrect |
39 ms |
102680 KB |
Output isn't correct |
| 19 |
Incorrect |
47 ms |
102876 KB |
Output isn't correct |
| 20 |
Incorrect |
38 ms |
102852 KB |
Output isn't correct |
| 21 |
Incorrect |
52 ms |
102724 KB |
Output isn't correct |
| 22 |
Incorrect |
50 ms |
102788 KB |
Output isn't correct |
| 23 |
Incorrect |
37 ms |
102892 KB |
Output isn't correct |
| 24 |
Incorrect |
48 ms |
102852 KB |
Output isn't correct |
| 25 |
Incorrect |
38 ms |
102868 KB |
Output isn't correct |
| 26 |
Incorrect |
37 ms |
102852 KB |
Output isn't correct |
| 27 |
Execution timed out |
1083 ms |
111816 KB |
Time limit exceeded |
| 28 |
Incorrect |
47 ms |
104080 KB |
Output isn't correct |
| 29 |
Incorrect |
43 ms |
104480 KB |
Output isn't correct |
| 30 |
Incorrect |
47 ms |
104924 KB |
Output isn't correct |
| 31 |
Execution timed out |
1088 ms |
112972 KB |
Time limit exceeded |
| 32 |
Incorrect |
48 ms |
104628 KB |
Output isn't correct |
| 33 |
Execution timed out |
1090 ms |
116704 KB |
Time limit exceeded |
| 34 |
Incorrect |
47 ms |
104184 KB |
Output isn't correct |
| 35 |
Execution timed out |
1086 ms |
116676 KB |
Time limit exceeded |
| 36 |
Execution timed out |
1094 ms |
116676 KB |
Time limit exceeded |
| 37 |
Correct |
69 ms |
102980 KB |
Output is correct |
| 38 |
Runtime error |
173 ms |
131076 KB |
Execution killed with signal 9 |
| 39 |
Correct |
52 ms |
102996 KB |
Output is correct |
| 40 |
Runtime error |
183 ms |
131076 KB |
Execution killed with signal 9 |
| 41 |
Correct |
55 ms |
102956 KB |
Output is correct |
| 42 |
Incorrect |
44 ms |
102860 KB |
Output isn't correct |
| 43 |
Runtime error |
171 ms |
131076 KB |
Execution killed with signal 9 |
| 44 |
Execution timed out |
1091 ms |
116676 KB |
Time limit exceeded |
| 45 |
Runtime error |
175 ms |
131076 KB |
Execution killed with signal 9 |
| 46 |
Runtime error |
176 ms |
131076 KB |
Execution killed with signal 9 |
| 47 |
Runtime error |
175 ms |
131076 KB |
Execution killed with signal 9 |
| 48 |
Runtime error |
183 ms |
131072 KB |
Execution killed with signal 9 |
| 49 |
Runtime error |
168 ms |
131076 KB |
Execution killed with signal 9 |
| 50 |
Runtime error |
170 ms |
131076 KB |
Execution killed with signal 9 |
| 51 |
Runtime error |
168 ms |
131076 KB |
Execution killed with signal 9 |
| 52 |
Runtime error |
175 ms |
131076 KB |
Execution killed with signal 9 |
| 53 |
Runtime error |
166 ms |
131076 KB |
Execution killed with signal 9 |
| 54 |
Runtime error |
169 ms |
131072 KB |
Execution killed with signal 9 |
| 55 |
Runtime error |
176 ms |
131076 KB |
Execution killed with signal 9 |
| 56 |
Runtime error |
163 ms |
131076 KB |
Execution killed with signal 9 |
| 57 |
Runtime error |
166 ms |
131076 KB |
Execution killed with signal 9 |
| 58 |
Runtime error |
178 ms |
131076 KB |
Execution killed with signal 9 |
| 59 |
Runtime error |
165 ms |
131076 KB |
Execution killed with signal 9 |
| 60 |
Runtime error |
167 ms |
131076 KB |
Execution killed with signal 9 |
| 61 |
Runtime error |
182 ms |
131076 KB |
Execution killed with signal 9 |
| 62 |
Runtime error |
170 ms |
131076 KB |
Execution killed with signal 9 |
| 63 |
Runtime error |
165 ms |
131076 KB |
Execution killed with signal 9 |
| 64 |
Runtime error |
162 ms |
131076 KB |
Execution killed with signal 9 |
| 65 |
Runtime error |
166 ms |
131076 KB |
Execution killed with signal 9 |
| 66 |
Runtime error |
172 ms |
131076 KB |
Execution killed with signal 9 |
| 67 |
Runtime error |
167 ms |
131076 KB |
Execution killed with signal 9 |
| 68 |
Runtime error |
176 ms |
131076 KB |
Execution killed with signal 9 |
| 69 |
Runtime error |
167 ms |
131076 KB |
Execution killed with signal 9 |
| 70 |
Incorrect |
97 ms |
122396 KB |
Output isn't correct |
| 71 |
Runtime error |
168 ms |
131076 KB |
Execution killed with signal 9 |
| 72 |
Runtime error |
164 ms |
131076 KB |
Execution killed with signal 9 |
| 73 |
Runtime error |
166 ms |
131076 KB |
Execution killed with signal 9 |
| 74 |
Runtime error |
165 ms |
131076 KB |
Execution killed with signal 9 |
| 75 |
Runtime error |
167 ms |
131076 KB |
Execution killed with signal 9 |
| 76 |
Runtime error |
162 ms |
131076 KB |
Execution killed with signal 9 |
| 77 |
Runtime error |
165 ms |
131076 KB |
Execution killed with signal 9 |
| 78 |
Runtime error |
180 ms |
131076 KB |
Execution killed with signal 9 |
| 79 |
Runtime error |
172 ms |
131076 KB |
Execution killed with signal 9 |
| 80 |
Runtime error |
170 ms |
131076 KB |
Execution killed with signal 9 |
| 81 |
Runtime error |
171 ms |
131076 KB |
Execution killed with signal 9 |
| 82 |
Runtime error |
198 ms |
131076 KB |
Execution killed with signal 9 |
| 83 |
Runtime error |
166 ms |
131076 KB |
Execution killed with signal 9 |
| 84 |
Runtime error |
162 ms |
131076 KB |
Execution killed with signal 9 |
| 85 |
Runtime error |
175 ms |
131076 KB |
Execution killed with signal 9 |
| 86 |
Runtime error |
165 ms |
131076 KB |
Execution killed with signal 9 |
| 87 |
Runtime error |
166 ms |
131076 KB |
Execution killed with signal 9 |
| 88 |
Runtime error |
175 ms |
131076 KB |
Execution killed with signal 9 |
| 89 |
Runtime error |
167 ms |
131076 KB |
Execution killed with signal 9 |
| 90 |
Incorrect |
96 ms |
122404 KB |
Output isn't correct |
| 91 |
Runtime error |
173 ms |
131076 KB |
Execution killed with signal 9 |
| 92 |
Runtime error |
168 ms |
131076 KB |
Execution killed with signal 9 |
| 93 |
Runtime error |
169 ms |
131076 KB |
Execution killed with signal 9 |
| 94 |
Runtime error |
171 ms |
131076 KB |
Execution killed with signal 9 |
| 95 |
Runtime error |
177 ms |
131076 KB |
Execution killed with signal 9 |
| 96 |
Runtime error |
165 ms |
131076 KB |
Execution killed with signal 9 |
| 97 |
Runtime error |
173 ms |
131076 KB |
Execution killed with signal 9 |
| 98 |
Runtime error |
166 ms |
131076 KB |
Execution killed with signal 9 |
| 99 |
Runtime error |
168 ms |
131076 KB |
Execution killed with signal 9 |
| 100 |
Runtime error |
167 ms |
131076 KB |
Execution killed with signal 9 |
