Submission #1235384

#	Time	Username	Problem	Language	Result	Execution time	Memory
1235384		rythm_of_knight	Lamps (JOI19_lamps)	C++17	100 / 100	205 ms	78672 KiB

lamp

#include <bits/stdc++.h>
#define ar array
#define all(x) x.begin(), x.end()
using namespace std;
typedef long long ll;

const int inf = 1e9 + 7;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    int n;
    cin >> n;
    vector <int> a(n + 1), b(n + 1);
    for (int i = 1; i <= n; i++) {
        char c; cin >> c;
        a[i] = c - '0';
    }
    for (int i = 1; i <= n; i++) {
        char c; cin >> c;
        b[i] = c - '0';
    }
    vector <vector <int>> dp(n + 1, vector <int> (8, inf));
    dp[0][0] = 0;
    for (int i = 1; i <= n; i++) {
        for (int ma = 0; ma < 8; ma++) {
            int cur = a[i];
            if (ma & 1) cur = 0;
            if (ma & 2) cur = 1;
            if (ma & 4) cur ^= 1;
            if (cur != b[i]) continue;
            for (int mb = 0; mb < 8; mb++) {
                int op = 0;
                for (int j = 0; j < 3; j++)
                    op += ((ma >> j) & 1) > ((mb >> j) & 1);
                dp[i][ma] = min(dp[i][ma], dp[i - 1][mb] + op);
            }
        }
    }
    int ans = inf;
    for (int i = 0; i < 8; i++)
        ans = min(ans, dp[n][i]);
    cout << ans;
}

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