| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 37228 |
2017-12-22T17:52:14 Z |
alenam0161 |
Bomb (IZhO17_bomb) |
C++14 |
|
1000 ms |
103648 KB |
#include<bits/stdc++.h>
using namespace std;
const int N = 2550;
int ans;
int x[N];
int n, m, a[N][N];
int s[N][N], H, W;
int f[N][N], bad[N][N];
int dpw[N], dph[N];
char S[N];
inline void press(int i, int j, int h, int w)
{
bad[i][j]++;
bad[i + h][j + w]++;
bad[i + h][j]--;
bad[i][j + w]--;
}
inline bool can(int h, int w)
{
for(int i = 1; i <= n; ++i)
for(int j = 1; j <= m; ++j)
bad[i][j] = 0, f[i][j] = 0;
for(int i = 1; i + h - 1 <= n; ++i)
for(int j = 1; j + w - 1 <= m; ++j)
if(s[i + h - 1][j + w - 1] - s[i + h - 1][j - 1] - s[i - 1][j + w - 1] + s[i - 1][j - 1] == h * w)
press(i, j, h, w);
for(int i = 1; i <= n; ++i)
for(int j = 1; j <= m; ++j)
{
f[i][j] = f[i - 1][j] + f[i][j - 1] - f[i - 1][j - 1] + bad[i][j];
if(a[i][j] == 1 && f[i][j] <= 0)
return false;
}
return true;
}
inline int getw(int h)
{
if(dpw[h] != -1) return dpw[h];
int L = 0, R = W + 1;
while(L + 1 < R)
{
int w = (L + R) >> 1;
if(can(h, w))
L = w;
else
R = w;
}
return dpw[h] = L;
}
inline int geth(int w)
{
if(dph[w] != -1) return dph[w];
int L = 0, R = H + 1;
while(L + 1 < R)
{
int h = (L + R) >> 1;
if(can(h, w))
L = h;
else
R = h;
}
return dph[w] = L;
}
int main()
{
// freopen("bomb.in", "r", stdin);
// freopen("bomb.out", "w", stdout);
scanf("%d%d", &n, &m);
for(int i = 0; i < 2550; ++i)
dpw[i] = dph[i] = -1;
for(int i = 2; i <= n + 1; ++i)
{
scanf("%s\n", S);
for(int j = 2; j <= m + 1; ++j)
a[i][j] = S[j - 2] - '0';
}
n += 2, m += 2;
for(int i = 1; i <= n; ++i)
for(int j = 1; j <= m; ++j)
s[i][j] = s[i - 1][j] + s[i][j - 1] - s[i - 1][j - 1] + a[i][j];
H = n, W = m;
for(int i = 1; i <= n; ++i)
{
int cnt = 0;
for(int j = 1; j <= m; ++j)
if(a[i][j] == 1) cnt++;
else
{
if(cnt) W = min(W, cnt);
cnt = 0;
}
}
for(int j = 1; j <= m; ++j)
{
int cnt = 0;
for(int i = 1; i <= n; ++i)
if(a[i][j] == 1) cnt++;
else
{
if(cnt) H = min(H, cnt);
cnt = 0;
}
}
for(int i = 1; i <= H;)
{
int x = getw(i);
int y = geth(x);
ans = max(ans, y * x);
i = y + 1;
}
ans = max(ans, max(W, H));
printf("%d\n", ans);
return 0;
}
Compilation message
bomb.cpp: In function 'int main()':
bomb.cpp:77:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &n, &m);
^
bomb.cpp:83:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%s\n", S);
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 2 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 3 |
Correct |
6 ms |
103648 KB |
Output is correct |
| 4 |
Correct |
6 ms |
103648 KB |
Output is correct |
| 5 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 6 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 7 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 8 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 9 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 10 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 11 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 12 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 13 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 14 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 15 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 16 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 17 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 18 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 19 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 20 |
Correct |
3 ms |
103648 KB |
Output is correct |
| 21 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 22 |
Correct |
3 ms |
103648 KB |
Output is correct |
| 23 |
Correct |
3 ms |
103648 KB |
Output is correct |
| 24 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 25 |
Correct |
3 ms |
103648 KB |
Output is correct |
| 26 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 27 |
Correct |
3 ms |
103648 KB |
Output is correct |
| 28 |
Correct |
33 ms |
103648 KB |
Output is correct |
| 29 |
Correct |
446 ms |
103648 KB |
Output is correct |
| 30 |
Correct |
56 ms |
103648 KB |
Output is correct |
| 31 |
Correct |
39 ms |
103648 KB |
Output is correct |
| 32 |
Correct |
43 ms |
103648 KB |
Output is correct |
| 33 |
Correct |
76 ms |
103648 KB |
Output is correct |
| 34 |
Correct |
39 ms |
103648 KB |
Output is correct |
| 35 |
Correct |
46 ms |
103648 KB |
Output is correct |
| 36 |
Correct |
19 ms |
103648 KB |
Output is correct |
| 37 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 38 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 39 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 40 |
Correct |
363 ms |
103648 KB |
Output is correct |
| 41 |
Correct |
0 ms |
103648 KB |
Output is correct |
| 42 |
Correct |
19 ms |
103648 KB |
Output is correct |
| 43 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 44 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 45 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 46 |
Correct |
729 ms |
103648 KB |
Output is correct |
| 47 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 48 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 49 |
Correct |
589 ms |
103648 KB |
Output is correct |
| 50 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 51 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 52 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 53 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 54 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 55 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 56 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 57 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 58 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 59 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 60 |
Correct |
746 ms |
103648 KB |
Output is correct |
| 61 |
Correct |
726 ms |
103648 KB |
Output is correct |
| 62 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 63 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 64 |
Correct |
986 ms |
103648 KB |
Output is correct |
| 65 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 66 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 67 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 68 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 69 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 70 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 71 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 72 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 73 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 74 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 75 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 76 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 77 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 78 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 79 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 80 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 81 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 82 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 83 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 84 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 85 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 86 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 87 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 88 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 89 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 90 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 91 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 92 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 93 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 94 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 95 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 96 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 97 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 98 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 99 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
| 100 |
Execution timed out |
1000 ms |
103648 KB |
Execution timed out |
