| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 91428 |
2018-12-27T12:45:40 Z |
Vardanyan |
Bomb (IZhO17_bomb) |
C++14 |
|
1000 ms |
74364 KB |
#include<bits/stdc++.h>
using namespace std;
const int N = 2505;
int a[N][N];
int pref[N][N];
int pref2[N][N];
int calc1(int x1,int y1,int x2,int y2){
return pref[x2][y2]-pref[x2][y1-1]-pref[x1-1][y2]+pref[x1-1][y1-1];
}
int calc2(int x1,int y1,int x2,int y2){
return pref2[x2][y2]-pref2[x2][y1-1]-pref2[x1-1][y2]+pref2[x1-1][y1-1];
}
int main()
{
int n,m;
scanf("%d%d",&n,&m);
for(int i = 1;i<=n;i++){
for(int j = 1;j<=m;j++){
char c;
scanf(" %c",&c);
a[i][j] = (c == '1');
}
}
for(int i = 1;i<=n;i++){
for(int j = 1;j<=m;j++){
pref[i][j] = pref[i-1][j]+pref[i][j-1]-pref[i-1][j-1]+a[i][j];
}
}
int ans = 1;
for(int p = n;p>=1;p--){
int lo = 1;
int hi = m;
int as = -1;
while(lo<=hi){
int mid = (lo+hi)/2;
int x = p;
int y = mid;
bool f = true;
for(int i = 1;i<=n;i++){
for(int j = 1;j<=m;j++){
// if(a[i][j]!=1) continue;
pref2[i][j] = pref2[i-1][j]+pref2[i][j-1]-pref2[i-1][j-1];
if(i+x-1<=n && j+y-1<=m){
if(calc1(i,j,i+x-1,j+y-1) == mid*p){
pref2[i][j] = pref2[i-1][j]+pref2[i][j-1]-pref2[i-1][j-1]+1;
}
}
if(a[i][j] == 0) continue;
int x1 = i-x+1;
int y1 = j-y+1;
x1 = max(1,x1);
y1 = max(1,y1);
if(calc2(x1,y1,i,j) == 0){
f = false;
break;
}
}
if(!f) break;
}
if(f){
// F = true;
// break;
lo = mid+1;
as = mid;
continue;
}
swap(x,y);
f = true;
for(int i = 1;i<=n;i++){
for(int j = 1;j<=m;j++){
// if(a[i][j]!=1) continue;
pref2[i][j] = pref2[i-1][j]+pref2[i][j-1]-pref2[i-1][j-1];
if(i+x-1<=n && j+y-1<=m){
if(calc1(i,j,i+x-1,j+y-1) == mid*p){
pref2[i][j] = pref2[i-1][j]+pref2[i][j-1]-pref2[i-1][j-1]+1;
}
}
if(a[i][j] == 0) continue;
int x1 = i-x+1;
int y1 = j-y+1;
x1 = max(1,x1);
y1 = max(1,y1);
if(calc2(x1,y1,i,j) == 0){
f = false;
break;
}
}
if(!f) break;
}
if(f){
// F = true;
// break;
lo = mid+1;
as = mid;
continue;
}
hi = mid-1;
if(hi*p<=ans) break;
}
if(as == -1) continue;
ans = max(ans,as*p);
}
cout<<ans<<endl;
return 0;
}
Compilation message
bomb.cpp: In function 'int main()':
bomb.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&m);
~~~~~^~~~~~~~~~~~~~
bomb.cpp:21:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf(" %c",&c);
~~~~~^~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
636 KB |
Output is correct |
| 3 |
Correct |
57 ms |
30536 KB |
Output is correct |
| 4 |
Correct |
36 ms |
30552 KB |
Output is correct |
| 5 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 6 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 7 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 8 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 9 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 10 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 11 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 12 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 13 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 14 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 15 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 16 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 17 |
Correct |
3 ms |
30552 KB |
Output is correct |
| 18 |
Correct |
3 ms |
30552 KB |
Output is correct |
| 19 |
Correct |
4 ms |
30552 KB |
Output is correct |
| 20 |
Correct |
4 ms |
30552 KB |
Output is correct |
| 21 |
Correct |
3 ms |
30552 KB |
Output is correct |
| 22 |
Correct |
3 ms |
30552 KB |
Output is correct |
| 23 |
Correct |
5 ms |
30552 KB |
Output is correct |
| 24 |
Correct |
4 ms |
30552 KB |
Output is correct |
| 25 |
Correct |
8 ms |
30552 KB |
Output is correct |
| 26 |
Correct |
6 ms |
30552 KB |
Output is correct |
| 27 |
Correct |
12 ms |
30552 KB |
Output is correct |
| 28 |
Correct |
14 ms |
30552 KB |
Output is correct |
| 29 |
Correct |
128 ms |
30552 KB |
Output is correct |
| 30 |
Correct |
346 ms |
30552 KB |
Output is correct |
| 31 |
Correct |
210 ms |
30552 KB |
Output is correct |
| 32 |
Correct |
188 ms |
30552 KB |
Output is correct |
| 33 |
Correct |
366 ms |
30552 KB |
Output is correct |
| 34 |
Correct |
16 ms |
30552 KB |
Output is correct |
| 35 |
Correct |
113 ms |
30552 KB |
Output is correct |
| 36 |
Correct |
340 ms |
30552 KB |
Output is correct |
| 37 |
Correct |
2 ms |
30552 KB |
Output is correct |
| 38 |
Execution timed out |
1083 ms |
74108 KB |
Time limit exceeded |
| 39 |
Correct |
2 ms |
74108 KB |
Output is correct |
| 40 |
Execution timed out |
1068 ms |
74108 KB |
Time limit exceeded |
| 41 |
Correct |
2 ms |
74108 KB |
Output is correct |
| 42 |
Correct |
9 ms |
74108 KB |
Output is correct |
| 43 |
Execution timed out |
1078 ms |
74108 KB |
Time limit exceeded |
| 44 |
Correct |
635 ms |
74108 KB |
Output is correct |
| 45 |
Execution timed out |
1084 ms |
74108 KB |
Time limit exceeded |
| 46 |
Correct |
676 ms |
74168 KB |
Output is correct |
| 47 |
Execution timed out |
1088 ms |
74168 KB |
Time limit exceeded |
| 48 |
Execution timed out |
1074 ms |
74236 KB |
Time limit exceeded |
| 49 |
Execution timed out |
1073 ms |
74236 KB |
Time limit exceeded |
| 50 |
Execution timed out |
1081 ms |
74236 KB |
Time limit exceeded |
| 51 |
Execution timed out |
1072 ms |
74236 KB |
Time limit exceeded |
| 52 |
Execution timed out |
1068 ms |
74236 KB |
Time limit exceeded |
| 53 |
Execution timed out |
1064 ms |
74236 KB |
Time limit exceeded |
| 54 |
Execution timed out |
1076 ms |
74236 KB |
Time limit exceeded |
| 55 |
Execution timed out |
1079 ms |
74236 KB |
Time limit exceeded |
| 56 |
Execution timed out |
1077 ms |
74236 KB |
Time limit exceeded |
| 57 |
Execution timed out |
1084 ms |
74236 KB |
Time limit exceeded |
| 58 |
Execution timed out |
1084 ms |
74236 KB |
Time limit exceeded |
| 59 |
Execution timed out |
1083 ms |
74236 KB |
Time limit exceeded |
| 60 |
Execution timed out |
1069 ms |
74236 KB |
Time limit exceeded |
| 61 |
Execution timed out |
1088 ms |
74236 KB |
Time limit exceeded |
| 62 |
Execution timed out |
1070 ms |
74236 KB |
Time limit exceeded |
| 63 |
Execution timed out |
1083 ms |
74236 KB |
Time limit exceeded |
| 64 |
Execution timed out |
1084 ms |
74236 KB |
Time limit exceeded |
| 65 |
Execution timed out |
1084 ms |
74236 KB |
Time limit exceeded |
| 66 |
Execution timed out |
1081 ms |
74236 KB |
Time limit exceeded |
| 67 |
Execution timed out |
1078 ms |
74236 KB |
Time limit exceeded |
| 68 |
Execution timed out |
1076 ms |
74236 KB |
Time limit exceeded |
| 69 |
Execution timed out |
1070 ms |
74236 KB |
Time limit exceeded |
| 70 |
Execution timed out |
1072 ms |
74236 KB |
Time limit exceeded |
| 71 |
Execution timed out |
1082 ms |
74236 KB |
Time limit exceeded |
| 72 |
Execution timed out |
1077 ms |
74236 KB |
Time limit exceeded |
| 73 |
Execution timed out |
1075 ms |
74236 KB |
Time limit exceeded |
| 74 |
Execution timed out |
1086 ms |
74236 KB |
Time limit exceeded |
| 75 |
Execution timed out |
1089 ms |
74236 KB |
Time limit exceeded |
| 76 |
Execution timed out |
1077 ms |
74236 KB |
Time limit exceeded |
| 77 |
Execution timed out |
1087 ms |
74236 KB |
Time limit exceeded |
| 78 |
Execution timed out |
1050 ms |
74236 KB |
Time limit exceeded |
| 79 |
Execution timed out |
1063 ms |
74236 KB |
Time limit exceeded |
| 80 |
Execution timed out |
1088 ms |
74236 KB |
Time limit exceeded |
| 81 |
Execution timed out |
1086 ms |
74236 KB |
Time limit exceeded |
| 82 |
Execution timed out |
1085 ms |
74236 KB |
Time limit exceeded |
| 83 |
Execution timed out |
1088 ms |
74236 KB |
Time limit exceeded |
| 84 |
Correct |
594 ms |
74236 KB |
Output is correct |
| 85 |
Execution timed out |
1083 ms |
74236 KB |
Time limit exceeded |
| 86 |
Execution timed out |
1081 ms |
74236 KB |
Time limit exceeded |
| 87 |
Execution timed out |
1084 ms |
74236 KB |
Time limit exceeded |
| 88 |
Execution timed out |
1077 ms |
74236 KB |
Time limit exceeded |
| 89 |
Execution timed out |
1094 ms |
74236 KB |
Time limit exceeded |
| 90 |
Execution timed out |
1086 ms |
74236 KB |
Time limit exceeded |
| 91 |
Execution timed out |
1081 ms |
74236 KB |
Time limit exceeded |
| 92 |
Execution timed out |
1066 ms |
74236 KB |
Time limit exceeded |
| 93 |
Execution timed out |
1086 ms |
74236 KB |
Time limit exceeded |
| 94 |
Execution timed out |
1086 ms |
74236 KB |
Time limit exceeded |
| 95 |
Execution timed out |
1080 ms |
74236 KB |
Time limit exceeded |
| 96 |
Execution timed out |
1078 ms |
74236 KB |
Time limit exceeded |
| 97 |
Execution timed out |
1077 ms |
74236 KB |
Time limit exceeded |
| 98 |
Execution timed out |
1083 ms |
74236 KB |
Time limit exceeded |
| 99 |
Execution timed out |
1077 ms |
74236 KB |
Time limit exceeded |
| 100 |
Correct |
910 ms |
74364 KB |
Output is correct |
