oj.uz

Submission #367204

# Submission time Handle Problem Language Result Execution time Memory
367204 2021-02-16T14:30:09 Z piddddgy JJOOII 2 (JOI20_ho_t2) C++11
100 / 100
 32 ms 5684 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define cerr if(false) cerr
#define watch(x) cerr << (#x) << " is " << (x) << endl;
#define endl '\n'
#define ld long double
#define int long long
#define pii pair<int, int>
#define fi first
#define se second
#define sz(a) (int)(a).size()
#define all(x) (x).begin(), (x).end()

const int maxn = 200500;

int n, k;
string s;
int psa[5][maxn];

int query(int i, int l, int r) {
    return psa[i][r] - psa[i][l-1];
}

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> k;
    cin >> s;

    s = "."+s;

    for(int i = 1; i <= n; i++) {
        if(s[i] == 'J') psa[1][i]++;
        if(s[i] == 'O') psa[2][i]++;
        if(s[i] == 'I') psa[3][i]++;
    }

    for(int i = 1; i <= 3; i++) {
        for(int j = 1; j <= n; j++) {
            psa[i][j] += psa[i][j-1];
        }
    }

    int ans = 1e18;

    // start j from i
    for(int i = 1; i <= n; i++) {
        int l = 1, r = n;
        int lg = -1;
        
        while(l <= r) {
            int mid = (l+r)/2;

            if(query(1, i, mid) >= k) {
                r = mid-1;
                lg = mid;
            } else {
                l = mid+1;
            }
        }

        if(lg == -1) continue;

        int lst = lg;
        l = lst+1, r = n;
        lg = -1;

        while(l <= r) {
            int mid = (l+r)/2;

            if(query(2, lst+1, mid) >= k) {
                r = mid-1;
                lg = mid;
            } else {
                l = mid+1;
            }
        }

        if(lg == -1) continue;

        lst = lg;
        l = lst+1, r = n;
        lg = -1;

        while(l <= r) {
            int mid = (l+r)/2;

            if(query(3, lst+1, mid) >= k) {
                r = mid-1;
                lg = mid;
            } else {
                l = mid+1;
            }
        }

        if(lg == -1) continue;

        ans = min(ans, lg-i+1 - 3*k);
    }

    if(ans == 1e18) {
        cout << -1 << endl;
    } else {
        cout << ans << endl;
    }
}

/*

find smallest subarray with k-level JOI as subsequence

bsearch

10 2
OJIJOIOIIJ

9 3
JJJOOOIII

9 3
IIIOOOJJJ



Did you read the bounds?
Did you make typos?
Are there edge cases (N=1?)
Are array sizes proper?
Integer overflow?
DS reset properly between test cases?
Is using long longs causing TLE?
Are you using floating points?
*/

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 3 ms 492 KB Output is correct
17 Correct 1 ms 512 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 492 KB Output is correct
20 Correct 1 ms 492 KB Output is correct
21 Correct 1 ms 492 KB Output is correct
22 Correct 1 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 492 KB Output is correct
25 Correct 1 ms 492 KB Output is correct
26 Correct 1 ms 492 KB Output is correct
27 Correct 1 ms 492 KB Output is correct
28 Correct 1 ms 640 KB Output is correct
29 Correct 1 ms 492 KB Output is correct
30 Correct 1 ms 492 KB Output is correct
31 Correct 1 ms 364 KB Output is correct
32 Correct 1 ms 492 KB Output is correct
33 Correct 1 ms 492 KB Output is correct
34 Correct 1 ms 492 KB Output is correct
35 Correct 1 ms 492 KB Output is correct

Subtask #3
87.0 / 87.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 3 ms 492 KB Output is correct
17 Correct 1 ms 512 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 492 KB Output is correct
20 Correct 1 ms 492 KB Output is correct
21 Correct 1 ms 492 KB Output is correct
22 Correct 1 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 492 KB Output is correct
25 Correct 1 ms 492 KB Output is correct
26 Correct 1 ms 492 KB Output is correct
27 Correct 1 ms 492 KB Output is correct
28 Correct 1 ms 640 KB Output is correct
29 Correct 1 ms 492 KB Output is correct
30 Correct 1 ms 492 KB Output is correct
31 Correct 1 ms 364 KB Output is correct
32 Correct 1 ms 492 KB Output is correct
33 Correct 1 ms 492 KB Output is correct
34 Correct 1 ms 492 KB Output is correct
35 Correct 1 ms 492 KB Output is correct
36 Correct 25 ms 5056 KB Output is correct
37 Correct 27 ms 5556 KB Output is correct
38 Correct 28 ms 5684 KB Output is correct
39 Correct 28 ms 5556 KB Output is correct
40 Correct 25 ms 5556 KB Output is correct
41 Correct 32 ms 5556 KB Output is correct
42 Correct 30 ms 5556 KB Output is correct
43 Correct 12 ms 3820 KB Output is correct
44 Correct 15 ms 4448 KB Output is correct
45 Correct 20 ms 5556 KB Output is correct
46 Correct 19 ms 5556 KB Output is correct
47 Correct 19 ms 5556 KB Output is correct
48 Correct 19 ms 5556 KB Output is correct
49 Correct 15 ms 3700 KB Output is correct
50 Correct 19 ms 5556 KB Output is correct
51 Correct 22 ms 5556 KB Output is correct
52 Correct 11 ms 5308 KB Output is correct
53 Correct 12 ms 5556 KB Output is correct
54 Correct 18 ms 5556 KB Output is correct
55 Correct 12 ms 5556 KB Output is correct
56 Correct 10 ms 5556 KB Output is correct