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B.cpp
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B.cpp
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#include<bits/stdc++.h>
#include<string>
using namespace std;
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL)
int main()
{
fastio;
long long n,m,i,j,l[30]={0},r[30]={0},mask,mn=INT_MAX,cst,lst=-1;
char ara[30][150];
cin>>n>>m;
for(i=n-1;i>=0;i--)
{
for(j=0;j<m+2;j++)
cin>>ara[i][j];
}
for(i=0;i<n;i++)
{
for(j=0;j<m+2;j++)
{
if(ara[i][j]=='1')
{
lst=i;
l[i]=j;
break;
}
}
}
if(lst==-1)
{
cout<<0<<"\n";
return 0;
}
for(i=0;i<n;i++)
{
for(j=m+1;j>=0;j--)
{
if(ara[i][j]=='1')
{
r[i]=j;
break;
}
}
}
for(mask=0;mask<(1<<(n-1));mask++)
{
cst=0;
for(i=0;i<n;i++)
{
if(i==0)
{
cst+=r[i];
if(i!=lst)
{
if(r[i]==0)
{
if(mask&1)
cst+=m+1;
}
else
{
if(mask&1)
cst+=m+1-r[i];
else
cst+=r[i];
}
cst++;
}
else
break;
}
else
{
if(mask&(1<<(i-1)))
{
if(l[i]!=0)
cst+=m+1-l[i];
if(i!=lst)
{
if(mask&(1<<i))
{
if(l[i]!=0)
cst+=m+1-l[i];
}
else
{
if(l[i]!=0)
cst+=l[i];
else
cst+=m+1;
}
cst++;
}
else
break;
}
else
{
if(r[i]!=0)
cst+=r[i];
if(i!=lst)
{
if(mask&(1<<i))
{
if(r[i]!=0)
cst+=m+1-r[i];
else
cst+=m+1;
}
else
cst+=r[i];
cst++;
}
else
break;
}
}
}
mn=min(mn,cst);
}
cout<<mn<<"\n";
return 0;
}