Submission #138131

#	Time	Username	Problem	Language	Result	Execution time	Memory
138131		Bodo171	Lamps (JOI19_lamps)	C++14	4 / 100	87 ms	4556 KiB

lamp

#include <iostream>
#include <fstream>
using namespace std;
int dp[2][10];
int cst,i,j,k,n,use,x,y,ans;
string a,b;
bool valid(int x,int y,int mov)
{
    if(mov%3)
        return ((mov%3)-1==y);
    return ((x^y)==mov/3);
}
int main()
{
    //freopen("data.in","r",stdin);
    ios_base::sync_with_stdio(false);
    cin>>n;
    cin>>a>>b;
    for(i=1;i<6;i++)
        dp[0][i]=(1<<30);
    for(i=0;i<n;i++)
    {
        use=1-use;
        x=a[i]-'0';y=b[i]-'0';
        for(j=0;j<6;j++)
            dp[use][j]=(1<<30);
        for(j=0;j<6;j++)
            if(valid(x,y,j))
             for(k=0;k<6;k++)
        {
            cst=(((j%3)!=(k%3)&&j%3!=0)+((j/3)>(k/3)));
            dp[use][j]=min(dp[use][j],dp[1-use][k]+cst);
        }
    }
    ans=(1<<30);
    for(j=0;j<6;j++)
        ans=min(ans,dp[use][j]);
    cout<<ans;
    return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 4 / 4
• Subtask 4: 0 / 49