Submission #1181673

#	Time	Username	Problem	Language	Result	Execution time	Memory
1181673		rythm_of_knight	Lamps (JOI19_lamps)	C++17	0 / 100	1098 ms	63048 KiB

lamp

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

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> (2, 1e9));
    dp[0][0] = 0;
    for (int i = 1; i <= n; i++) {
        if (a[i] == b[i]) {
            dp[i] = dp[i - 1];
            dp[i][0] = min(dp[i][0], dp[i][1]);
            dp[i][1] += 2;
            continue;
        }
        vector <int> cnt(2, 0), c(2, 0);
        int now = 2, tog = 1e9, nw = 2, ok = 0;
        for (int j = i; j >= 1; j--) {
            if (b[j] != now)
                cnt[now = b[j]]++;
            if (a[j] == b[j] && !ok)
                ok = j;
            if (ok && b[j] != nw)
                c[nw = b[j]]++;
            dp[i][0] = min(dp[i][0], min(dp[j - 1][0], dp[j - 1][1]) + min(cnt[0] + (cnt[1] > 0), cnt[1] + (cnt[0] > 0)));
            int v = min(c[0] + (c[1] > 0), c[1] + (c[0] > 0));
            if (ok != i)
                dp[i][1] = min(dp[i][1], min(dp[j - 1][1] + v, dp[j - 1][0] + v + 1));
            else
                dp[i][1] = dp[i][0] + 2;
        }
    }
    cout << min(dp[n][0], dp[n][1]);
}

/*
12
101010101010
010111111101

33
010101010101010101010101010101010
101000111000111000111000111000101
*/

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