Submission #922747

#	Time	Username	Problem	Language	Result	Execution time	Memory
922747		vjudge1	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	8 ms	4588 KiB

ho_t2

// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #include <x86intrin.h>

#include <bits/stdc++.h>
#include <chrono>
#include <random>

// @author: Vlapos

namespace operators
{
    template <typename T1, typename T2>
    std::istream &operator>>(std::istream &in, std::pair<T1, T2> &x)
    {
        in >> x.first >> x.second;
        return in;
    }

    template <typename T1, typename T2>
    std::ostream &operator<<(std::ostream &out, std::pair<T1, T2> x)
    {
        out << x.first << " " << x.second;
        return out;
    }

    template <typename T1>
    std::istream &operator>>(std::istream &in, std::vector<T1> &x)
    {
        for (auto &i : x)
            in >> i;
        return in;
    }

    template <typename T1>
    std::ostream &operator<<(std::ostream &out, std::vector<T1> &x)
    {
        for (auto &i : x)
            out << i << " ";
        return out;
    }

    template <typename T1>
    std::ostream &operator<<(std::ostream &out, std::set<T1> &x)
    {
        for (auto &i : x)
            out << i << " ";
        return out;
    }
}

// name spaces
using namespace std;
using namespace operators;
// end of name spaces

// defines
#define ll long long
#define ull unsigned long long
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define f first
#define s second
#define uint unsigned int
#define all(vc) vc.begin(), vc.end()
// end of defines

// usefull stuff

void boost()
{
    ios_base ::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

inline int getbit(int &x, int &bt) { return (x >> bt) & 1; }

const int dx4[4] = {-1, 0, 0, 1};
const int dy4[4] = {0, -1, 1, 0};
const int dx8[8] = {-1, -1, -1, 0, 0, 1, 1, 1};
const int dy8[8] = {-1, -0, 1, -1, 1, -1, 0, 1};

const ll INF = (1e18) + 500;
const int BIG = (1e9) * 2 + 100;
const int MAXN = (1e5) + 5;
const int MOD7 = (1e9) + 7;
const int MOD9 = (1e9) + 9;
const uint MODFFT = 998244353;

// #define int ll

struct test
{
    int n, k;
    string s;
    void doSolve(vector<int> &a, char c)
    {
        int cnt = 0, u1 = 0;
        for (int i = 0; i < n; ++i)
        {
            while (cnt < k and u1 < n)
            {
                if (s[u1] == c)
                    cnt++;
                u1++;
            }
            if (cnt != k)
                a[i] = -1;
            else
                a[i] = u1;

            if (s[i] == c)
                cnt--;
        }
    }

    void solve(int testcase)
    {
        boost();
        cin >> n >> k;
        cin >> s;
        vector<int> a(n);

        vector<vector<int>> next(3, vector<int>(n));
        doSolve(next[0], 'J');
        doSolve(next[1], 'O');
        doSolve(next[2], 'I');

        int res = BIG;
        for (int i = 0; i < n; ++i)
        {
            int r = next[0][i];
            if (r == -1 or r == n)
                break;
            r = next[1][r];
            if (r == -1 or r == n)
                break;
            r = next[2][r];
            if (r == -1)
                break;
            res = min(res, (r - i) - 3 * k);
        }
        if (res == BIG)
            cout << "-1\n";
        else
            cout << res << "\n";
    }
};

main()
{
    boost();
    int q = 1;
    // cin >> q;
    for (int i = 0; i < q; i++)
    {
        test t;
        t.solve(i);
    }
    return 0;
}
//[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]//
//                                                                                    //
//                               Coded by Der_Vlἀpos                                  //
//                                                                                    //
//[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]//

Compilation message (stderr)

ho_t2.cpp:153:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  153 | main()
      | ^~~~

• Subtask 1: 1 / 1
• Subtask 2: 12 / 12
• Subtask 3: 87 / 87