| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 333998 |
2020-12-08T05:16:58 Z |
juggernaut |
Bomb (IZhO17_bomb) |
C++14 |
|
1000 ms |
58724 KB |
#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);
| ~~~~~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
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 |
