#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization("unroll-loops")
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
#include <iostream>
#define pb push_back
using namespace std;
int pp[501][501];
int u[501][501];
void solve(){
int n,m;
cin>>n>>m;
if(n==1){
str s;
cin>>s;
vector<int >v;
int k=0;
for(int i=0;i<m;i++){
if(s[i]=='1')k++;
else{
if(k>0){
v.pb(k);
k=0;
}
}
}
if(k>0){
v.pb(k);
}
int ans=1;
if(v.size()==0){
cout<<0;
return;
}
for(int i=2;i<=m;i++){
k=1;
for(int j=0;j<(int)v.size();j++){
if(v[j]<i){
k=0;
break;
}
}
if(k==1){
ans=i;
}
}
cout<<ans;
}
else if(m==1){
char s;
vector<int >v;
int k=0;
for(int i=0;i<n;i++){
cin>>s;
if(s=='1')k++;
else{
if(k>0){
v.pb(k);
k=0;
}
}
}
if(k>0){
v.pb(k);
}
int ans=1;
if(v.size()==0){
cout<<0;
return;
}
for(int i=2;i<=n;i++){
k=1;
for(int j=0;j<(int)v.size();j++){
if(v[j]<i){
k=0;
break;
}
}
if(k==1){
ans=i;
}
}
cout<<ans;
}
else{
str s[n+3];
int a[n+3][m+3];
int o=0;
for(int i=1;i<=n;i++){
cin>>s[i];
for(int j=0;j<m;j++){
a[i][j+1]=s[i][j]-'0';
o+=(a[i][j]==1);
pp[i][j+1]=a[i][j+1]+pp[i][j]+pp[i-1][j+1]-pp[i-1][j];
}
}
if(o==0){
cout<<0;
return;
}
int ans=0;
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(i*j<=ans){
continue;
}
for(int i1=1;i1<=n;i1++){
for(int j1=1;j1<=m;j1++){
u[i1][j1]=0;
}
}
for(int i1=1;i1<=n;i1++){
for(int j1=1;j1<=m;j1++){
if(i1+i-1>n || j1+j-1>m)continue;
if(pp[i1+i-1][j1+j-1]+pp[i1-1][j1-1]-pp[i1+i-1][j1-1]-pp[i1-1][j1+j-1]==i*j){
for(int i2=i1;i2<=i1+i-1;i2++){
for(int j2=j1;j2<=j1+j-1;j2++){
u[i2][j2]=1;
}
}
}
}
}
int k=1;
for(int i1=1;i1<=n;i1++){
for(int j1=1;j1<=m;j1++){
if(u[i1][j1]!=a[i1][j1]){
k=0;
break;
}
}
}
if(k==1){
/*cout<<i<<" "<<j<<"\n";
for(int i1=1;i1<=n;i1++){
for(int j1=1;j1<=m;j1++){
cout<<u[i1][j1];
}
cout<<"\n";
}//*/
ans=max(ans,i*j);
}
}
}
cout<<ans;
}
}
signed main(){
ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
//srand( time(0));
//rand()
//freopen("sum.in", "r", stdin);
//freopen("sum.out", "w", stdout);
int tests=1;
//cin>>tests;
for(int i=1;i<=tests;i++){
//cout<<"TEST CASE : "<<i<<"\n";
solve();
}
}
Compilation message
bomb.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
3 | #pragma GCC optimization("unroll-loops")
|
bomb.cpp: In function 'void solve()':
bomb.cpp:17:9: error: 'str' was not declared in this scope; did you mean 'std'?
17 | str s;
| ^~~
| std
bomb.cpp:18:14: error: 's' was not declared in this scope
18 | cin>>s;
| ^
bomb.cpp:19:9: error: 'vector' was not declared in this scope
19 | vector<int >v;
| ^~~~~~
bomb.cpp:7:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
6 | #include <iostream>
+++ |+#include <vector>
7 | #define pb push_back
bomb.cpp:19:16: error: expected primary-expression before 'int'
19 | vector<int >v;
| ^~~
bomb.cpp:25:21: error: 'v' was not declared in this scope
25 | v.pb(k);
| ^
bomb.cpp:31:13: error: 'v' was not declared in this scope
31 | v.pb(k);
| ^
bomb.cpp:34:12: error: 'v' was not declared in this scope
34 | if(v.size()==0){
| ^
bomb.cpp:40:32: error: 'v' was not declared in this scope
40 | for(int j=0;j<(int)v.size();j++){
| ^
bomb.cpp:54:9: error: 'vector' was not declared in this scope
54 | vector<int >v;
| ^~~~~~
bomb.cpp:54:9: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
bomb.cpp:54:16: error: expected primary-expression before 'int'
54 | vector<int >v;
| ^~~
bomb.cpp:61:21: error: 'v' was not declared in this scope
61 | v.pb(k);
| ^
bomb.cpp:67:13: error: 'v' was not declared in this scope
67 | v.pb(k);
| ^
bomb.cpp:70:12: error: 'v' was not declared in this scope
70 | if(v.size()==0){
| ^
bomb.cpp:76:32: error: 'v' was not declared in this scope
76 | for(int j=0;j<(int)v.size();j++){
| ^
bomb.cpp:89:9: error: 'str' was not declared in this scope; did you mean 'std'?
89 | str s[n+3];
| ^~~
| std
bomb.cpp:93:18: error: 's' was not declared in this scope
93 | cin>>s[i];
| ^
