Submission #869613

#	Time	Username	Problem	Language	Result	Execution time	Memory
869613		12345678	Lamps (JOI19_lamps)	C++17	100 / 100	25 ms	27824 KiB

lamp

#include <bits/stdc++.h>

using namespace std;

const int nx=1e6+5;
int dp[nx][6], n;
string a, b;

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>a>>b;
    dp[0][1]=dp[0][2]=dp[0][3]=dp[0][4]=dp[0][5]=1e9;
    for (int i=1; i<=n; i++)
    {
        dp[i][0]=dp[i][1]=dp[i][2]=dp[i][3]=dp[i][4]=dp[i][5]=1e9;
        int mn=min({dp[i-1][0], dp[i-1][1], dp[i-1][2], dp[i-1][3], dp[i-1][4], dp[i-1][5]});
        if (a[i-1]==b[i-1]) dp[i][0]=mn;
        if (b[i-1]=='0') dp[i][1]=min({dp[i-1][1], mn+1, dp[i-1][5]}), dp[i][4]=min({dp[i-1][4], mn+2, dp[i-1][2]+1, dp[i-1][3]+1, dp[i-1][5]+1});
        if (b[i-1]=='1') dp[i][2]=min({dp[i-1][2], mn+1, dp[i-1][4]}), dp[i][5]=min({dp[i-1][5], mn+2, dp[i-1][1]+1, dp[i-1][3]+1, dp[i-1][4]+1});
        if (a[i-1]!=b[i-1]) dp[i][3]=min({dp[i-1][3], mn+1, dp[i-1][4], dp[i-1][5]});
    }
    cout<<min({dp[n][0], dp[n][1], dp[n][2], dp[n][3], dp[n][4], dp[n][5]});
}

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