Submission #1028954

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028954		otarius	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	7 ms	4872 KiB

ho_t2

#include <bits/stdc++.h>
#include <bits/extc++.h>
using namespace __gnu_pbds;
using namespace std;

// #pragma GCC optimize("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#define ff first
#define sc second
#define pb push_back
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define ull unsigned long long
#define all(x) (x).begin(),(x).end()

// #define int long long
// #define int unsigned long long

// #define ordered_set(T) tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>
// #define ordered_multiset(T) tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>

void open_file(string filename) {
    freopen((filename + ".in").c_str(), "r", stdin);
    freopen((filename + ".out").c_str(), "w", stdout);
}

// const ll mod = 1e9 + 7;
// const ll mod = 998244353;

const ll inf = 1e9;
const ll biginf = 1e18;
// const int maxN;

void solve() {
    int n, k; string s;
    cin >> n >> k >> s;
    int arr[n + 1];
    for (int i = 1; i <= n; i++) {
        if (s[i - 1] == 'J') arr[i] = 0;
        else if (s[i - 1] == 'O') arr[i] = 1;
        else arr[i] = 2;
    } deque<int> dq[3];
    int nxt[n + 1][3];
    for (int i = 1; i <= n; i++)
        for (int j = 0; j < 3; j++) nxt[i][j] = -1;
    for (int i = n; i >= 1; i--) {
        dq[arr[i]].push_back(i);
        if (dq[arr[i]].size() > k)
            dq[arr[i]].pop_front();
        for (int j = 0; j < 3; j++) {
            if (dq[j].size() < k) continue;
            nxt[i][j] = dq[j].front();
        }
    } int ans = inf;
    for (int i = 1; i <= n; i++) {
        int j = nxt[i][0];
        if (j == -1) continue;
        j = nxt[j][1];
        if (j == -1) continue;
        j = nxt[j][2];
        if (j == -1) continue;
        ans = min(ans, j - i + 1);
    } if (ans == inf) {
        cout << -1; return;
    } cout << ans - 3 * k;
}
int32_t main() { 
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
        cout << '\n';
    }
    return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'void solve()':
ho_t2.cpp:51:31: warning: comparison of integer expressions of different signedness: 'std::deque<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   51 |         if (dq[arr[i]].size() > k)
      |             ~~~~~~~~~~~~~~~~~~^~~
ho_t2.cpp:54:30: warning: comparison of integer expressions of different signedness: 'std::deque<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   54 |             if (dq[j].size() < k) continue;
      |                 ~~~~~~~~~~~~~^~~
ho_t2.cpp: In function 'void open_file(std::string)':
ho_t2.cpp:26:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     freopen((filename + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ho_t2.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     freopen((filename + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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