Submission #157005

#	Time	Username	Problem	Language	Result	Execution time	Memory
157005		atoiz	Lamps (JOI19_lamps)	C++14	4 / 100	29 ms	2836 KiB

lamp

#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <cstring>
#include <string>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cassert>
#include <numeric>
#include <utility>
#include <tuple>
#include <bitset>
#include <climits>
#include <random>
#include <chrono>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <queue>
#include <ios>
#include <iomanip>

using namespace std;

#define FOR(i, a, b) for (int i = a; i <= b; ++i)
#define FORA(i, a) for (auto &i : a)
#define FORB(i, a, b) for (int i = a; i >= b; --i)
#define SZ(a) ((int) a.size())
#define ALL(a) begin(a), end(a)

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int INF = 1e9;
int N;
string A, B;
int F[2][4], G[2][4];
void upd(int &a, int b) { if (a > b) a = b; }

signed main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    while (cin >> N >> A >> B) {
    FOR(i, 0, 1) FOR(j, 0, 3) F[i][j] = INF;
    F[0][0] = 0;

    FOR(idx, 0, N - 1) {
        FOR(i, 0, 1) FOR(j, 0, 3) G[i][j] = INF;
        FOR(i, 0, 1) {
            upd(G[i][1], F[i][0] + 1);
            if (idx > 0 && B[idx - 1] == B[idx]) {
                FOR(j, 1, 3) upd(G[i][j], F[i][j]);
            } else {
                upd(G[i][2], F[i][1] + 1);
                upd(G[i][3], F[i][2]);
                upd(G[i][2], F[i][3] + 1);
            }
        }

        bool toggle = (A[idx] != B[idx]);
        FOR(j, 0, 3) {
            upd(G[toggle][0], F[toggle][j]);
            upd(G[toggle][0], F[!toggle][j] + toggle);
        }

        FOR(i, 0, 1) FOR(j, 0, 3) F[i][j] = G[i][j];
    }

    int ans = INF;
    FOR(i, 0, 1) FOR(j, 0, 3) upd(ans, F[i][j]);
    cout << ans << endl;
}
}

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