# open judge 特殊的密码锁 贪心

2016/11/11 11:32

http://noi.openjudge.cn/ch0406/8469/

``````#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
char a[1000],b[1000],c[1000];
int main()
{
scanf("%s%s",a+1,b+1);
int x=strlen(a+1),y=strlen(b+1);
for(int i=1;i<=x;i++)
c[i]=a[i];
int ans=0,ans2=0;
ans2++;
if(c[1]=='0') c[1]='1';
else c[1]='0';
if(c[2]=='0') c[2]='1';
else  c[2]='0';
for(int i=1;i<=x;i++)
{
if(c[i]!=b[i]&&i+1<=x)
{
ans2++;
c[i]=b[i];
if(c[i+1]=='0') c[i+1]='1';
else c[i+1]='0';
if(c[i+2]=='0') c[i+2]='1';
else c[i+2]='0';
}
}
int h=0,h2=0;
for(int i=1;i<=x;i++)
{
if(c[i]!=b[i])
{
h=1;
break;
}
}
for(int i=1;i<=x;i++)
{
if(a[i]!=b[i]&&i+1<=x)
{
ans++;
a[i]=b[i];
if(a[i+1]=='0') a[i+1]='1';
else a[i+1]='0';
if(a[i+2]=='0') a[i+2]='1';
else a[i+2]='0';
}
}
for(int i=1;i<=x;i++)
{
if(a[i]!=b[i])
{
h2=1;
break;
}
}
if(h2==0&&h==0)
{
int tq=min(ans,ans2);
cout<<tq;
}
else if(h2==0&&h==1)
cout<<ans;
else if(h==0&&h2==1)
cout<<ans2;
else  puts("impossible");
return 0;
}``````

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