Submission #1092494

#	Time	Username	Problem	Language	Result	Execution time	Memory
1092494		LOLOLO	Lamps (JOI19_lamps)	C++17	100 / 100	47 ms	16284 KiB

lamp

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

#define           f     first
#define           s     second
#define           pb    push_back
#define           ep    emplace
#define           eb    emplace_back
#define           lb    lower_bound
#define           ub    upper_bound
#define       all(x)    x.begin(), x.end()
#define      rall(x)    x.rbegin(), x.rend()
#define   uniquev(v)    sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define     mem(f,x)    memset(f , x , sizeof(f))
#define        sz(x)    (ll)(x).size()
#define  __lcm(a, b)    (1ll * ((a) / __gcd((a), (b))) * (b))
#define          mxx    *max_element
#define          mnn    *min_element
#define    cntbit(x)    __builtin_popcountll(x)
#define       len(x)    (int)(x.length())

const int N = 1e6 + 100;
int f[N][3];
string a, b;

char get(int x, int y) {
    if (y == 1)
        return '0';

    if (y == 2)
        return '1';

    return a[x];
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    //freopen("LIGHTS.inp", "r", stdin);
    //freopen("LIGHTS.out", "w", stdout);

    mem(f, 0x3f);
    int n;
    cin >> n;
    cin >> a >> b;

    f[0][0] = (a[0] != b[0]);
    f[0][1] = (int)(b[0] != '0') + 1;
    f[0][2] = (int)(b[0] != '1') + 1;

    for (int i = 1; i < n; i++) {
        for (int j = 0; j < 3; j++) {
            for (int k = 0; k < 3; k++) {
                char s1 = get(i - 1, j), s2 = get(i, k);
                int d1 = s1 != b[i - 1], d2 = s2 != b[i];
                f[i][k] = min(f[i][k], f[i - 1][j] + (d1 == 0 && d2 == 1) + (k != j && k));
            }
        }
    }

    cout << min({f[n - 1][0], f[n - 1][1], f[n - 1][2]}) << '\n';
    return 0;
}

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