Submission #1260154

#	Time	Username	Problem	Language	Result	Execution time	Memory
1260154		tvgk	Lamps (JOI19_lamps)	C++20	100 / 100	34 ms	41528 KiB

lamp

#include<bits/stdc++.h>
using namespace std;
#define task "a"
#define se second
#define fi first
#define ll long long
#define ii pair<ll, ll>
const long mxN = 1e6 + 7, inf = 1e9 + 7;

int n, dp[mxN][10];
string s, t;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen(task".INP", "r", stdin);
    //freopen(task".OUT", "w", stdout);

    cin >> n;
    cin >> s;
    cin >> t;
    s = '0' + s;
    t = '0' + t;

    for (int i = 0; i <= n; i++)
    {
        for (int j = 0; j < 8; j++)
            dp[i][j] = inf;
    }

    dp[0][0] = 0;
    for (int i = 1; i <= n; i++)
    {
        if (s[i] == t[i])
            dp[i][0] = dp[i - 1][0];
        else
            dp[i][3] = min(dp[i - 1][0] + 1, dp[i - 1][3]);

        if (t[i] == '1')
        {
            dp[i][1] = min({dp[i - 1][0] + 1, dp[i - 1][1]});
            dp[i][4] = min({dp[i - 1][1] + 1, dp[i - 1][3] + 1, dp[i - 1][4]});
            dp[i][7] = min({dp[i - 1][2] + 1, dp[i - 1][3] + 1, dp[i - 1][7]});
        }
        else
        {
            dp[i][2] = min(dp[i - 1][0] + 1, dp[i - 1][2]);
            dp[i][5] = min({dp[i - 1][3] + 1, dp[i - 1][2] + 1, dp[i - 1][5]});
            dp[i][6] = min({dp[i - 1][1] + 1, dp[i - 1][3] + 1, dp[i - 1][6]});
        }

        for (int j = 4; j <= 7; j++)
            dp[i][3] = min(dp[i][3], dp[i][j]);
        dp[i][2] = min({dp[i][2], dp[i][5], dp[i][7]});
        dp[i][1] = min({dp[i][1], dp[i][4], dp[i][6]});
        dp[i][0] = min({dp[i][0], dp[i][1], dp[i][2], dp[i][3]});
    }
    cout << dp[n][0];
}

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