Submission #937663

#	Time	Username	Problem	Language	Result	Execution time	Memory
937663		groshi	Lamps (JOI19_lamps)	C++17	4 / 100	33 ms	35648 KiB

lamp

#include<bits/stdc++.h>
using namespace std;
//#define int long long
int dp[1000100][8];
int inf=1e9;
int32_t main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    int n;
    cin>>n;
    string a,b;
    cin>>a>>b;
    a='$'+a;
    b='$'+b;
    for(int i=0;i<=n;i++)
        for(int j=0;j<6;j++)
            dp[i][j]=inf;
    dp[0][0]=0;
    for(int i=1;i<=n;i++)
    {
        if(b[i]=='0')
            dp[i][5]=min({dp[i-1][0]+2,dp[i-1][1]+1,dp[i-1][3]+1,dp[i-1][5]});
        if(b[i]=='1')
            dp[i][4]=min(dp[i-1][0]+1,dp[i-1][4]);
        dp[i][4]=min(dp[i][4],dp[i][5]);
        if(b[i]=='1')
            dp[i][3]=min({dp[i-1][0]+2,dp[i-1][1]+1,dp[i-1][2]+1,dp[i-1][3]});
        if(b[i]=='0')
            dp[i][2]=min(dp[i-1][0]+1,dp[i-1][2]);
        dp[i][2]=min({dp[i][2],dp[i][3]});
        if(a[i]!=b[i])
            dp[i][1]=min(dp[i-1][1],dp[i-1][0]+1);
        dp[i][1]=min({dp[i][1],dp[i][3],dp[i][5]});
        if(a[i]==b[i])
            dp[i][0]=dp[i-1][0];
        dp[i][0]=min({dp[i][0],dp[i][1],dp[i][2],dp[i][3],dp[i][4],dp[i][5]});
        //cout<<i<<": "<<dp[i][0]<<" "<<dp[i][1]<<" "<<dp[i][2]<<" "<<dp[i][3]<<" "<<dp[i][4]<<" "<<dp[i][5]<<"\n";
    }
    cout<<dp[n][0];
    return 0;
}

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