| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 35060 |
2017-11-17T20:42:00 Z |
model_code |
Bomb (IZhO17_bomb) |
C++14 |
|
1000 ms |
103624 KB |
#include<bits/stdc++.h>
using namespace std;
const int N = 2550;
int ans;
int n, m, a[N][N];
int s[N][N], H, W;
int f[N][N], bad[N][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)
{
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 L;
}
inline int geth(int 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 L;
}
int main()
{
scanf("%d%d", &n, &m);
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;
}
}
int L = 1, R = H + 1;
while(L + 2 < R)
{
int ma = L + R >> 1;
if(getw(ma) * ma < getw(ma + 1) * (ma + 1))
L = ma;
else
R = ma + 1;
}
for(int i = L; i <= R; ++i)
ans = max(ans, getw(i) * i);
L = 1, R = W + 1;
while(L + 2 < R)
{
int ma = L + R >> 1;
if(geth(ma) * ma < geth(ma + 1) * (ma + 1))
L = ma;
else
R = ma + 1;
}
for(int i = L; i <= R; ++i)
ans = max(ans, geth(i) * i);
printf("%d\n", ans);
return 0;
}
Compilation message
bomb.cpp: In function 'int main()':
bomb.cpp:114:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
int ma = L + R >> 1;
^
bomb.cpp:127:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
int ma = L + R >> 1;
^
bomb.cpp:70:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &n, &m);
^
bomb.cpp:74:19: 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 |
103624 KB |
Output is correct |
| 2 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 3 |
Correct |
13 ms |
103624 KB |
Output is correct |
| 4 |
Correct |
9 ms |
103624 KB |
Output is correct |
| 5 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 6 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 7 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 8 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 9 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 10 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 11 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 12 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 13 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 14 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 15 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 16 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 17 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 18 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 19 |
Incorrect |
3 ms |
103624 KB |
Output isn't correct |
| 20 |
Correct |
3 ms |
103624 KB |
Output is correct |
| 21 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 22 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 23 |
Incorrect |
6 ms |
103624 KB |
Output isn't correct |
| 24 |
Incorrect |
3 ms |
103624 KB |
Output isn't correct |
| 25 |
Incorrect |
6 ms |
103624 KB |
Output isn't correct |
| 26 |
Correct |
6 ms |
103624 KB |
Output is correct |
| 27 |
Correct |
6 ms |
103624 KB |
Output is correct |
| 28 |
Correct |
36 ms |
103624 KB |
Output is correct |
| 29 |
Correct |
193 ms |
103624 KB |
Output is correct |
| 30 |
Incorrect |
209 ms |
103624 KB |
Output isn't correct |
| 31 |
Incorrect |
139 ms |
103624 KB |
Output isn't correct |
| 32 |
Incorrect |
149 ms |
103624 KB |
Output isn't correct |
| 33 |
Incorrect |
263 ms |
103624 KB |
Output isn't correct |
| 34 |
Correct |
43 ms |
103624 KB |
Output is correct |
| 35 |
Incorrect |
136 ms |
103624 KB |
Output isn't correct |
| 36 |
Correct |
236 ms |
103624 KB |
Output is correct |
| 37 |
Incorrect |
0 ms |
103624 KB |
Output isn't correct |
| 38 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 39 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 40 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 41 |
Correct |
0 ms |
103624 KB |
Output is correct |
| 42 |
Incorrect |
9 ms |
103624 KB |
Output isn't correct |
| 43 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 44 |
Incorrect |
343 ms |
103624 KB |
Output isn't correct |
| 45 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 46 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 47 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 48 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 49 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 50 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 51 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 52 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 53 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 54 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 55 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 56 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 57 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 58 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 59 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 60 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 61 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 62 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 63 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 64 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 65 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 66 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 67 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 68 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 69 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 70 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 71 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 72 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 73 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 74 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 75 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 76 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 77 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 78 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 79 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 80 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 81 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 82 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 83 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 84 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 85 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 86 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 87 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 88 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 89 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 90 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 91 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 92 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 93 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 94 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 95 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 96 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 97 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 98 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 99 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
| 100 |
Execution timed out |
1000 ms |
103624 KB |
Execution timed out |
