This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define N 1001000
using namespace std;
int n,ans,a[N],b[N],f[N][5][2];
char s1[N],s2[N];
int main()
{
scanf("%d%s%s",&n,s1+1,s2+1);
for(int i=1;i<=n;++i)
a[i]=s2[i]-'0'+1,b[i]=(s1[i]!=s2[i]);
memset(f,127/3,sizeof(f));
f[0][0][0]=0;
for(int i=1;i<=n;++i)
for(int j=0;j<=2;++j)
for(int k=0;k<=1;++k){
f[i][0][b[i]]=min(f[i][0][b[i]],f[i-1][j][k]+(b[i]&&(b[i]!=k)));
if(j){
f[i][j][k]=min(f[i][j][k],f[i-1][j][k]+(a[i]!=j&&a[i]!=a[i-1]));
f[i][j][!k]=min(f[i][j][!k],f[i-1][j][k]+(!k)+(a[i]==j&&a[i]==a[i-1]));
}
f[i][a[i]][k]=min(f[i][a[i]][k],f[i-1][j][k]+1);
}
ans=f[0][0][1];
for(int j=0;j<=2;++j)
for(int k=0;k<=1;++k)
ans=min(ans,f[n][j][k]);
printf("%d\n",ans);
return 0;
}
Compilation message (stderr)
lamp.cpp: In function 'int main()':
lamp.cpp:8:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
8 | scanf("%d%s%s",&n,s1+1,s2+1);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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