Submission #1299028

#	Time	Username	Problem	Language	Result	Execution time	Memory
1299028		daotuankhoi	JJOOII 2 (JOI20_ho_t2)	C++20	100 / 100	188 ms	2256 KiB

ho_t2

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define ll long long

template <class T> bool ckmax(T &a, T b) { return a < b ? (a = b, true) : false; }
template <class T> bool ckmin(T &a, T b) { return a > b ? (a = b, true) : false; }

const int MAXN = 2e5 + 5;
char a[MAXN];
vector<int> pos[3];

int main() {
    #define NAME "test"
    if (fopen(NAME".inp", "r")) {
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, k; cin >> n >> k;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        int id;
        if (a[i] == 'J') id = 0;
        else if (a[i] == 'O') id = 1;
        else id = 2;
        pos[id].emplace_back(i);
    }
    int ans = 1e9;
    for (int i = k - 1; i < (int)pos[2].size(); i++) {
        int x = pos[2][i - k + 1];
        int pos1 = lower_bound(pos[1].begin(), pos[1].end(), x) - pos[1].begin() - 1;
        if (pos1 < k - 1) continue;
        x = pos[1][pos1 - k + 1];
        int pos0 = lower_bound(pos[0].begin(), pos[0].end(), x) - pos[0].begin() - 1;
        if (pos0 < k - 1) continue;
        ckmin(ans, pos[2][i] - pos[0][pos0 - k + 1] + 1 - k * 3);
        cerr << pos[0][pos0 - k + 1] << ' ' << pos[2][i] << '\n';
    }
    cout << (ans == 1e9 ? -1 : ans) << '\n';
    return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
ho_t2.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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