| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 697265 |
2023-02-09T01:37:56 Z |
allllekssssa |
Bomb (IZhO17_bomb) |
C++14 |
|
948 ms |
76760 KB |
#include<bits/stdc++.h>
using namespace std;
#define pii pair<int ,int>
#define pb push_back
const int maxN = 2600;
int n, m;
int a[maxN][maxN];
int d[maxN][maxN];
int c[maxN][maxN];
string s;
int cnt[maxN];
int getDSum(int x1, int y1, int x2, int y2) {
if (x2 > n || y2 > m) return 0;
return d[x2][y2] + d[x1 - 1][y1 - 1] - d[x1 - 1][y2] - d[x2][y1 - 1];
}
int getCSum(int x1, int y1, int x2, int y2) {
x1 = max(x1, 1);
y1 = max(y1, 1);
return c[x2][y2] + c[x1 - 1][y1 - 1] - c[x1 - 1][y2] - c[x2][y1 - 1];
}
bool check(int x, int y) {
for (int i = 1; i<=n; i++) {
for (int j = 1; j<=m; j++) {
c[i][j] = 0;
}
}
for (int i = 1; i<=n; i++) {
for (int j = 1; j<=m; j++) {
if (getDSum(i, j, i + x - 1, j + y - 1) == x * y) c[i][j] = 1;
}
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j<=m; j++) {
c[i][j] += c[i - 1][j] + c[i][j - 1] - c[i - 1][j - 1];
}
}
for (int i = 1; i<=n; i++) {
for (int j = 1; j <= m; j++) {
if (a[i][j] && getCSum(i - x + 1, j - y + 1, i, j) == 0) return false;
}
}
return true;
}
int heuristic1() {
vector<pii> gornji;
for (int i = 1; i<=n; i++) {
for (int j = 1; j<=m; j++) {
if (a[i - 1][j] == 0 && a[i][j - 1] == 0 && a[i][j] == 1) gornji.pb({i, j});
}
}
// random_shuffle(gornji.begin(), gornji.end());
for (int i = 1; i <=n; i++) {
cnt[i] = m;
}
for (int i = 0; i < min(2700, (int) gornji.size()); i++) {
for (int len = 1; len <= n; len++) {
int x = gornji[i].first;
int y = gornji[i].second;
int lo = -1;
int ro = m + 1;
while(lo < ro - 1) {
int mid = lo + ro >> 1;
if (getDSum(x, y, x + len - 1, y + mid - 1) == len * mid) lo = mid; else ro = mid;
}
cnt[len] = min(cnt[len], lo);
}
}
for (int i = gornji.size() - 1; i > min((int) gornji.size() - 200, 0); i--) {
for (int len = 1; len <= n; len++) {
int x = gornji[i].first;
int y = gornji[i].second;
int lo = -1;
int ro = m + 1;
while(lo < ro - 1) {
int mid = lo + ro >> 1;
if (getDSum(x, y, x + len - 1, y + mid - 1) == len * mid) lo = mid; else ro = mid;
}
cnt[len] = min(cnt[len], lo);
}
}
int ans = 0;
for (int i = 1; i<=n; i++) {
ans = max(ans, i * cnt[i]);
}
return ans;
}
int heuristic() {
int minW = n;
int minH = m;
for (int i = 1; i<=n; i++) {
int cur = 0;
for (int j = 1; j<=m; j++) {
if (a[i][j] == 1) cur++; else {
if (cur > 0) {
minH = min(minH, cur);
cur = 0;
}
}
}
if (cur > 0) minH = min(minH, cur);
}
for (int j = 1; j<=m; j++) {
int cur = 0;
for (int i = 1; i<=n; i++) {
if (a[i][j] == 1) cur++; else {
if (cur > 0) {
minW = min(minW, cur);
cur = 0;
}
}
}
if (cur > 0) minW = min(minW, cur);
}
int ans = minW * minH;
if (!check(minW, minH)) return heuristic1();
return ans;
}
int main() {
cin >> n >> m;
for (int i = 1; i <=n; i++) {
cin >> s;
for (int j = 0; j < m; j++) {
a[i][j + 1] = s[j] - '0';
}
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j<=m; j++) {
d[i][j] = d[i - 1][j] + d[i][j - 1] + a[i][j] - d[i - 1][j - 1];
}
}
if (n > 450 || m > 450) {
cout << heuristic() << endl;
return 0;
}
int ans = 0;
int width = m;
for (int i = 1; i <=n; i++) {
while (width > 0 && !check(i, width)) width--;
ans = max(ans, i * width);
}
cout << ans << endl;
}
Compilation message
bomb.cpp: In function 'int heuristic1()':
bomb.cpp:83:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
83 | int mid = lo + ro >> 1;
| ~~~^~~~
bomb.cpp:102:26: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
102 | int mid = lo + ro >> 1;
| ~~~^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
468 KB |
Output is correct |
| 3 |
Correct |
14 ms |
30396 KB |
Output is correct |
| 4 |
Correct |
13 ms |
30392 KB |
Output is correct |
| 5 |
Correct |
0 ms |
340 KB |
Output is correct |
| 6 |
Correct |
0 ms |
340 KB |
Output is correct |
| 7 |
Correct |
0 ms |
340 KB |
Output is correct |
| 8 |
Correct |
0 ms |
468 KB |
Output is correct |
| 9 |
Correct |
1 ms |
468 KB |
Output is correct |
| 10 |
Correct |
1 ms |
468 KB |
Output is correct |
| 11 |
Correct |
1 ms |
468 KB |
Output is correct |
| 12 |
Correct |
0 ms |
468 KB |
Output is correct |
| 13 |
Correct |
0 ms |
468 KB |
Output is correct |
| 14 |
Correct |
1 ms |
468 KB |
Output is correct |
| 15 |
Correct |
1 ms |
468 KB |
Output is correct |
| 16 |
Correct |
0 ms |
468 KB |
Output is correct |
| 17 |
Correct |
3 ms |
1108 KB |
Output is correct |
| 18 |
Correct |
3 ms |
1108 KB |
Output is correct |
| 19 |
Correct |
7 ms |
1492 KB |
Output is correct |
| 20 |
Correct |
6 ms |
1516 KB |
Output is correct |
| 21 |
Correct |
3 ms |
980 KB |
Output is correct |
| 22 |
Correct |
5 ms |
1320 KB |
Output is correct |
| 23 |
Correct |
8 ms |
1620 KB |
Output is correct |
| 24 |
Correct |
4 ms |
1364 KB |
Output is correct |
| 25 |
Correct |
10 ms |
1632 KB |
Output is correct |
| 26 |
Correct |
9 ms |
1620 KB |
Output is correct |
| 27 |
Correct |
127 ms |
4768 KB |
Output is correct |
| 28 |
Correct |
266 ms |
5076 KB |
Output is correct |
| 29 |
Correct |
336 ms |
6456 KB |
Output is correct |
| 30 |
Correct |
627 ms |
7700 KB |
Output is correct |
| 31 |
Correct |
467 ms |
6080 KB |
Output is correct |
| 32 |
Correct |
467 ms |
6996 KB |
Output is correct |
| 33 |
Correct |
750 ms |
8084 KB |
Output is correct |
| 34 |
Correct |
115 ms |
5516 KB |
Output is correct |
| 35 |
Correct |
553 ms |
8088 KB |
Output is correct |
| 36 |
Correct |
665 ms |
8088 KB |
Output is correct |
| 37 |
Correct |
1 ms |
468 KB |
Output is correct |
| 38 |
Correct |
270 ms |
76632 KB |
Output is correct |
| 39 |
Correct |
0 ms |
468 KB |
Output is correct |
| 40 |
Incorrect |
38 ms |
19864 KB |
Output isn't correct |
| 41 |
Correct |
1 ms |
468 KB |
Output is correct |
| 42 |
Correct |
12 ms |
1620 KB |
Output is correct |
| 43 |
Correct |
285 ms |
76532 KB |
Output is correct |
| 44 |
Correct |
948 ms |
8088 KB |
Output is correct |
| 45 |
Incorrect |
477 ms |
76624 KB |
Output isn't correct |
| 46 |
Correct |
265 ms |
76536 KB |
Output is correct |
| 47 |
Incorrect |
462 ms |
76644 KB |
Output isn't correct |
| 48 |
Correct |
358 ms |
76704 KB |
Output is correct |
| 49 |
Correct |
272 ms |
76532 KB |
Output is correct |
| 50 |
Incorrect |
361 ms |
76616 KB |
Output isn't correct |
| 51 |
Incorrect |
342 ms |
76580 KB |
Output isn't correct |
| 52 |
Correct |
354 ms |
76652 KB |
Output is correct |
| 53 |
Incorrect |
320 ms |
76564 KB |
Output isn't correct |
| 54 |
Correct |
406 ms |
76760 KB |
Output is correct |
| 55 |
Incorrect |
403 ms |
76644 KB |
Output isn't correct |
| 56 |
Correct |
277 ms |
76632 KB |
Output is correct |
| 57 |
Incorrect |
311 ms |
76632 KB |
Output isn't correct |
| 58 |
Correct |
388 ms |
76600 KB |
Output is correct |
| 59 |
Correct |
396 ms |
76644 KB |
Output is correct |
| 60 |
Correct |
265 ms |
76552 KB |
Output is correct |
| 61 |
Correct |
280 ms |
76624 KB |
Output is correct |
| 62 |
Correct |
270 ms |
76532 KB |
Output is correct |
| 63 |
Correct |
304 ms |
76604 KB |
Output is correct |
| 64 |
Correct |
266 ms |
76548 KB |
Output is correct |
| 65 |
Correct |
348 ms |
76672 KB |
Output is correct |
| 66 |
Incorrect |
281 ms |
76528 KB |
Output isn't correct |
| 67 |
Correct |
362 ms |
76640 KB |
Output is correct |
| 68 |
Incorrect |
359 ms |
76620 KB |
Output isn't correct |
| 69 |
Correct |
307 ms |
76632 KB |
Output is correct |
| 70 |
Incorrect |
189 ms |
61292 KB |
Output isn't correct |
| 71 |
Incorrect |
278 ms |
76596 KB |
Output isn't correct |
| 72 |
Incorrect |
295 ms |
76632 KB |
Output isn't correct |
| 73 |
Incorrect |
285 ms |
76608 KB |
Output isn't correct |
| 74 |
Incorrect |
279 ms |
76696 KB |
Output isn't correct |
| 75 |
Incorrect |
284 ms |
76636 KB |
Output isn't correct |
| 76 |
Incorrect |
280 ms |
76540 KB |
Output isn't correct |
| 77 |
Incorrect |
282 ms |
76536 KB |
Output isn't correct |
| 78 |
Incorrect |
285 ms |
76620 KB |
Output isn't correct |
| 79 |
Incorrect |
285 ms |
76748 KB |
Output isn't correct |
| 80 |
Incorrect |
276 ms |
76624 KB |
Output isn't correct |
| 81 |
Incorrect |
286 ms |
76740 KB |
Output isn't correct |
| 82 |
Incorrect |
312 ms |
76636 KB |
Output isn't correct |
| 83 |
Incorrect |
279 ms |
76748 KB |
Output isn't correct |
| 84 |
Incorrect |
295 ms |
76596 KB |
Output isn't correct |
| 85 |
Incorrect |
297 ms |
76560 KB |
Output isn't correct |
| 86 |
Incorrect |
363 ms |
76752 KB |
Output isn't correct |
| 87 |
Incorrect |
280 ms |
76580 KB |
Output isn't correct |
| 88 |
Incorrect |
275 ms |
76532 KB |
Output isn't correct |
| 89 |
Incorrect |
313 ms |
76748 KB |
Output isn't correct |
| 90 |
Incorrect |
198 ms |
61360 KB |
Output isn't correct |
| 91 |
Incorrect |
295 ms |
76532 KB |
Output isn't correct |
| 92 |
Incorrect |
292 ms |
76532 KB |
Output isn't correct |
| 93 |
Incorrect |
289 ms |
76748 KB |
Output isn't correct |
| 94 |
Incorrect |
288 ms |
76632 KB |
Output isn't correct |
| 95 |
Incorrect |
280 ms |
76588 KB |
Output isn't correct |
| 96 |
Incorrect |
294 ms |
76608 KB |
Output isn't correct |
| 97 |
Incorrect |
288 ms |
76616 KB |
Output isn't correct |
| 98 |
Incorrect |
282 ms |
76636 KB |
Output isn't correct |
| 99 |
Incorrect |
286 ms |
76600 KB |
Output isn't correct |
| 100 |
Incorrect |
280 ms |
76628 KB |
Output isn't correct |
