Submission #540932

#	Time	Username	Problem	Language	Result	Execution time	Memory
540932		PixelCat	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	12 ms	3692 KiB

ho_t2

/* code by the cute ~~Dengdualang~~ PixelCat owo */
/*     as cute as nacho neko (aka. my wife)!     */

/*     Nhade stay for a night here               */
/*     183234 deng deng deng pixelcat oops       */
/*     (yang wang yesu)*2                        */
/*     ^ some weird stuff. nvm =w=               */

#pragma GCC optimize("O4,unroll-loops,no-stack-protector")
#include <bits/stdc++.h>
// #define int LL  //__int128
#define double long double
using namespace std;
using LL = long long;
using LLL = __int128_t;
using uLL = unsigned long long;
using pii = pair<int, int>;

#define For(i, a, b) for (int i = a; i <= b; i++)
#define Fors(i, a, b, s) for (int i = a; i <= b; i += s)
#define Forr(i, a, b) for (int i = a; i >= b; i--)
#define F first
#define S second
#define L(id) (id * 2 + 1)
#define R(id) (id * 2 + 2)
#define LO(x) (x & (-x))

#define eb emplace_back
#define all(x) x.begin(), x.end()
#define sz(x) ((int)x.size())
#define mkp make_pair

#define MOD (int)(998244353)
// #define MOD (int)((LL)1e9 + 7)
// #define INF (int)(4e18)  // 9e18
#define INF 1e9
#define EPS (1e-6)

#ifdef NYAOWO
#include "library/debug.hpp"
inline void USACO(const string &s) {
    cerr << "USACO: " << s << "\n";
}

#else
#define debug(...)
inline void timer() {}
inline void USACO(const string &s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

#endif

inline void NYA() {
    ios::sync_with_stdio(false);
    cin.tie(0);
}
inline int gcd(int a, int b) {
    return __gcd(a, b);
}
inline int lcm(int a, int b) {
    return a / gcd(a, b) * b;
}
int fpow(int b, int p, const int &mod) {
    int ans = 1;
    while (p) {
        if (p & 1) ans = ans * b % mod;
        p >>= 1;
        b = b * b % mod;
    }
    return ans;
}
int fpow(int b, int p) {
    return fpow(b, p, MOD);
}
template <typename T>
inline void chmin(T &_a, const T &_b) {
    if (_b < _a) _a = _b;
}
template <typename T>
inline void chmax(T &_a, const T &_b) {
    if (_b > _a) _a = _b;
}
// mt19937_64 rng(
//     chrono::steady_clock::now().time_since_epoch().count());

int a[200020];
int nxt[3][200020];

int32_t main() {
    NYA();
    // nyaacho >/////<
    // miku sama bless me >/////<
    int n,K; cin>>n>>K;
    For(i,1,n){
        char ch; cin>>ch;
        if(ch=='J') a[i]=0;
        else if(ch=='O') a[i]=1;
        else a[i]=2;
    }
    For(ch,0,2){
        queue<int> que;
        For(i,1,n){
            if(a[i]==ch) que.emplace(i);
            if(sz(que)>K) que.pop();
            if(sz(que)==K) nxt[ch][i]=que.front();
            else nxt[ch][i]=-1;
            // cout<<(nxt[ch][i]+(nxt[ch][i]==-1));
        }
        // cout<<"\n";
    }
    int ans=INF;
    For(i,1,n){
        int j=nxt[2][i]-1;
        int k=(j<0?-1:nxt[1][j])-1;
        int l=(k<0?-1:nxt[0][k]);
        if(l>0){
            // debug(i,l);
            chmin(ans,i-l+1-K*3);
        }
    }
    if(ans==INF) cout<<"-1\n";
    else cout<<ans<<"\n";
    return 0;
}

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