#include<bits/stdc++.h>
using namespace std;
int n,m,mx,cnt[2505][2505],pref[2505][2505];
bool a[2505][2505];
char rd(){
char ch;
do{
scanf("%c",&ch);
}while(ch!='0'&&ch!='1');
return ch;
}
bool sum(int x,int y,int x2,int y2){
return (cnt[x2][y2]-cnt[x2][y-1]-cnt[x-1][y2]+cnt[x-1][y-1])==((x2-x+1)*(y2-y+1));
}
bool check(int x,int y){
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)pref[i][j]=0;
for(int i=1;i+x-1<=n;i++)
for(int j=1;j+y-1<=m;j++)
if(sum(i,j,i+x-1,j+y-1)){
for(int k=i;k<=i+x-1;k++)pref[k][j]++,pref[k][j+y]--;
}
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
pref[i][j]+=pref[i][j-1];
if(a[i][j]&&!pref[i][j])return false;
}
}
return true;
}
bool check_1(int x,int y){
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)pref[i][j]=0;
for(int i=1;i+x-1<=n;i++)
for(int j=1;j+y-1<=m;j++)
if(sum(i,j,i+x-1,j+y-1)){
for(int k=j;k<=j+y-1;k++)pref[i][k]++,pref[i+x][k]--;
}
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
pref[i][j]+=pref[i-1][j];
if(a[i][j]&&!pref[i][j])return false;
}
}
return true;
}
int main(){
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++){
a[i][j]=(rd()=='1');
cnt[i][j]=cnt[i-1][j]+cnt[i][j-1]-cnt[i-1][j-1]+a[i][j];
}
// if(n<m){
// for(int x=1;x<=m;x++){
// int l=1,r=n;
// while(l<r){
// int mid=(l+r+1)>>1;
// if(check(mid,x))l=mid;
// else r=mid-1;
// }
// if(!check(l,x))l=0;
// mx=max(mx,x*l);
// }
// printf("%d",mx);
// }else{
for(int x=1;x<=n;x++){
int l=max(1,(mx+x-1)/x),r=m;
while(l<r){
int mid=(l+r+1)>>1;
if(check_1(x,mid))l=mid;
else r=mid-1;
}
if(!check_1(x,l))l=0;
mx=max(mx,x*l);
}
printf("%d",mx);
//}
}
Compilation message
bomb.cpp: In function 'char rd()':
bomb.cpp:8:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
8 | scanf("%c",&ch);
| ~~~~~^~~~~~~~~~
bomb.cpp: In function 'int main()':
bomb.cpp:48:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
48 | scanf("%d%d",&n,&m);
| ~~~~~^~~~~~~~~~~~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
364 KB |
Output is correct |
2 |
Correct |
1 ms |
512 KB |
Output is correct |
3 |
Correct |
184 ms |
26604 KB |
Output is correct |
4 |
Correct |
153 ms |
26476 KB |
Output is correct |
5 |
Correct |
1 ms |
364 KB |
Output is correct |
6 |
Correct |
1 ms |
364 KB |
Output is correct |
7 |
Correct |
1 ms |
364 KB |
Output is correct |
8 |
Correct |
1 ms |
492 KB |
Output is correct |
9 |
Correct |
1 ms |
492 KB |
Output is correct |
10 |
Correct |
1 ms |
492 KB |
Output is correct |
11 |
Correct |
1 ms |
492 KB |
Output is correct |
12 |
Correct |
1 ms |
492 KB |
Output is correct |
13 |
Correct |
1 ms |
492 KB |
Output is correct |
14 |
Correct |
1 ms |
492 KB |
Output is correct |
15 |
Correct |
1 ms |
492 KB |
Output is correct |
16 |
Correct |
1 ms |
492 KB |
Output is correct |
17 |
Correct |
5 ms |
1004 KB |
Output is correct |
18 |
Correct |
4 ms |
1152 KB |
Output is correct |
19 |
Correct |
9 ms |
1388 KB |
Output is correct |
20 |
Correct |
9 ms |
1388 KB |
Output is correct |
21 |
Correct |
4 ms |
876 KB |
Output is correct |
22 |
Correct |
7 ms |
1132 KB |
Output is correct |
23 |
Correct |
13 ms |
1516 KB |
Output is correct |
24 |
Correct |
7 ms |
1260 KB |
Output is correct |
25 |
Correct |
15 ms |
1516 KB |
Output is correct |
26 |
Correct |
39 ms |
1516 KB |
Output is correct |
27 |
Correct |
462 ms |
4224 KB |
Output is correct |
28 |
Correct |
367 ms |
4332 KB |
Output is correct |
29 |
Execution timed out |
1097 ms |
5484 KB |
Time limit exceeded |
30 |
Execution timed out |
1092 ms |
6508 KB |
Time limit exceeded |
31 |
Correct |
726 ms |
5228 KB |
Output is correct |
32 |
Correct |
825 ms |
6032 KB |
Output is correct |
33 |
Execution timed out |
1088 ms |
6764 KB |
Time limit exceeded |
34 |
Correct |
305 ms |
4844 KB |
Output is correct |
35 |
Execution timed out |
1048 ms |
6888 KB |
Time limit exceeded |
36 |
Execution timed out |
1094 ms |
6892 KB |
Time limit exceeded |
37 |
Correct |
1 ms |
492 KB |
Output is correct |
38 |
Execution timed out |
1084 ms |
57784 KB |
Time limit exceeded |
39 |
Correct |
1 ms |
492 KB |
Output is correct |
40 |
Execution timed out |
1088 ms |
16236 KB |
Time limit exceeded |
41 |
Correct |
1 ms |
492 KB |
Output is correct |
42 |
Correct |
26 ms |
1516 KB |
Output is correct |
43 |
Execution timed out |
1092 ms |
58092 KB |
Time limit exceeded |
44 |
Execution timed out |
1083 ms |
6764 KB |
Time limit exceeded |
45 |
Execution timed out |
1046 ms |
58604 KB |
Time limit exceeded |
46 |
Execution timed out |
1098 ms |
58604 KB |
Time limit exceeded |
47 |
Execution timed out |
1091 ms |
58724 KB |
Time limit exceeded |
48 |
Execution timed out |
1047 ms |
58232 KB |
Time limit exceeded |
49 |
Execution timed out |
1101 ms |
58220 KB |
Time limit exceeded |
50 |
Execution timed out |
1060 ms |
58220 KB |
Time limit exceeded |
51 |
Execution timed out |
1099 ms |
58220 KB |
Time limit exceeded |
52 |
Execution timed out |
1061 ms |
58348 KB |
Time limit exceeded |
53 |
Execution timed out |
1094 ms |
57708 KB |
Time limit exceeded |
54 |
Execution timed out |
1100 ms |
57452 KB |
Time limit exceeded |
55 |
Execution timed out |
1094 ms |
57452 KB |
Time limit exceeded |
56 |
Execution timed out |
1094 ms |
57708 KB |
Time limit exceeded |
57 |
Execution timed out |
1070 ms |
57720 KB |
Time limit exceeded |
58 |
Execution timed out |
1094 ms |
57580 KB |
Time limit exceeded |
59 |
Execution timed out |
1086 ms |
57452 KB |
Time limit exceeded |
60 |
Execution timed out |
1090 ms |
57452 KB |
Time limit exceeded |
61 |
Execution timed out |
1095 ms |
57452 KB |
Time limit exceeded |
62 |
Execution timed out |
1093 ms |
57580 KB |
Time limit exceeded |
63 |
Execution timed out |
1093 ms |
57452 KB |
Time limit exceeded |
64 |
Execution timed out |
1050 ms |
57580 KB |
Time limit exceeded |
65 |
Execution timed out |
1059 ms |
57580 KB |
Time limit exceeded |
66 |
Execution timed out |
1091 ms |
57708 KB |
Time limit exceeded |
67 |
Execution timed out |
1096 ms |
57452 KB |
Time limit exceeded |
68 |
Execution timed out |
1097 ms |
57452 KB |
Time limit exceeded |
69 |
Execution timed out |
1095 ms |
57580 KB |
Time limit exceeded |
70 |
Execution timed out |
1096 ms |
46572 KB |
Time limit exceeded |
71 |
Execution timed out |
1088 ms |
58220 KB |
Time limit exceeded |
72 |
Execution timed out |
1091 ms |
57452 KB |
Time limit exceeded |
73 |
Execution timed out |
1092 ms |
57580 KB |
Time limit exceeded |
74 |
Execution timed out |
1095 ms |
57580 KB |
Time limit exceeded |
75 |
Execution timed out |
1049 ms |
57836 KB |
Time limit exceeded |
76 |
Execution timed out |
1089 ms |
57452 KB |
Time limit exceeded |
77 |
Execution timed out |
1087 ms |
57452 KB |
Time limit exceeded |
78 |
Execution timed out |
1031 ms |
57580 KB |
Time limit exceeded |
79 |
Execution timed out |
1049 ms |
57576 KB |
Time limit exceeded |
80 |
Execution timed out |
1090 ms |
57492 KB |
Time limit exceeded |
81 |
Execution timed out |
1085 ms |
57520 KB |
Time limit exceeded |
82 |
Execution timed out |
1056 ms |
58092 KB |
Time limit exceeded |
83 |
Execution timed out |
1069 ms |
57452 KB |
Time limit exceeded |
84 |
Execution timed out |
1089 ms |
57412 KB |
Time limit exceeded |
85 |
Execution timed out |
1069 ms |
57836 KB |
Time limit exceeded |
86 |
Execution timed out |
1090 ms |
57452 KB |
Time limit exceeded |
87 |
Execution timed out |
1091 ms |
57708 KB |
Time limit exceeded |
88 |
Execution timed out |
1089 ms |
57708 KB |
Time limit exceeded |
89 |
Execution timed out |
1092 ms |
57580 KB |
Time limit exceeded |
90 |
Execution timed out |
1089 ms |
46444 KB |
Time limit exceeded |
91 |
Execution timed out |
1091 ms |
58248 KB |
Time limit exceeded |
92 |
Execution timed out |
1059 ms |
57780 KB |
Time limit exceeded |
93 |
Execution timed out |
1047 ms |
57196 KB |
Time limit exceeded |
94 |
Execution timed out |
1089 ms |
57324 KB |
Time limit exceeded |
95 |
Execution timed out |
1096 ms |
57196 KB |
Time limit exceeded |
96 |
Execution timed out |
1051 ms |
57196 KB |
Time limit exceeded |
97 |
Execution timed out |
1090 ms |
57324 KB |
Time limit exceeded |
98 |
Execution timed out |
1092 ms |
57452 KB |
Time limit exceeded |
99 |
Execution timed out |
1089 ms |
57324 KB |
Time limit exceeded |
100 |
Execution timed out |
1088 ms |
57452 KB |
Time limit exceeded |