oj.uz

Submission #625270

# Submission time Handle Problem Language Result Execution time Memory
625270 2022-08-09T17:58:35 Z boris_mihov JJOOII 2 (JOI20_ho_t2) C++14
100 / 100
 631 ms 1652 KB 
#include <algorithm>
#include <iostream>
#include <numeric>
#include <vector>
#include <deque>

typedef long long llong;
const int MAXN = 200000 + 10;
const llong INF = 1e18;

int n, k;
char s[MAXN];
std::deque <int> byLetter[3];

int search(int idx, int pos)
{
    int l = -1, r = byLetter[idx].size(), mid;
    while (l < r - 1)
    {
        mid = (l + r) / 2;
        if (byLetter[idx][mid] < pos) l = mid;
        else r = mid;
    }

    if (l + k <= (int)byLetter[idx].size()-1) return byLetter[idx][l + k];
    return -1;
}

bool check(int deleted)
{
    if (n - deleted < 3*k) return false;
    byLetter[0].clear();
    byLetter[1].clear();
    byLetter[2].clear();
    for (int i = n ; i >= 1 ; --i)
    {
        if (s[i] == 'J') byLetter[0].push_front(i);
        if (s[i] == 'O') byLetter[1].push_front(i);
        if (s[i] == 'I') byLetter[2].push_front(i);
        if (i <= deleted && i != 0)
        {
            int endLetter = n - deleted + i;
            if (s[endLetter] == 'J') byLetter[0].pop_back();
            if (s[endLetter] == 'O') byLetter[1].pop_back();
            if (s[endLetter] == 'I') byLetter[2].pop_back();
        }

        if (byLetter[0].size() >= k)
        {
            int pos = search(1, byLetter[0][k-1]);
            if (pos != -1) pos = search(2, pos);
            if (pos != -1) return true;
        }
    }

    return false;
}

void solve()
{
    int l = -1, r = n + 1, mid;
    while (l < r - 1)
    {
        mid = (l + r) / 2;
        if (check(mid)) l = mid;
        else r = mid;
    }    

    if (l == -1) std::cout << -1 << '\n';
    else std::cout << n - 3*k - l << '\n';
}

void read()
{
    std::cin >> n >> k;
    std::cin >> s + 1;
}

void fastIO()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}

int main()
{
    fastIO();
    read();
    solve();

    return 0;
}

Compilation message

ho_t2.cpp: In function 'bool check(int)':
ho_t2.cpp:48:32: warning: comparison of integer expressions of different signedness: 'std::deque<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   48 |         if (byLetter[0].size() >= k)
      |             ~~~~~~~~~~~~~~~~~~~^~~~
ho_t2.cpp: In function 'void read()':
ho_t2.cpp:76:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   76 |     std::cin >> s + 1;
      |                 ~~^~~

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 336 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 304 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 336 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 2 ms 340 KB Output is correct
21 Correct 4 ms 284 KB Output is correct
22 Correct 3 ms 340 KB Output is correct
23 Correct 2 ms 340 KB Output is correct
24 Correct 4 ms 340 KB Output is correct
25 Correct 4 ms 332 KB Output is correct
26 Correct 4 ms 340 KB Output is correct
27 Correct 4 ms 328 KB Output is correct
28 Correct 3 ms 468 KB Output is correct
29 Correct 5 ms 340 KB Output is correct
30 Correct 3 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 2 ms 340 KB Output is correct
33 Correct 1 ms 340 KB Output is correct
34 Correct 1 ms 340 KB Output is correct
35 Correct 0 ms 340 KB Output is correct

Subtask #3
87.0 / 87.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 336 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 304 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 0 ms 340 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 2 ms 340 KB Output is correct
20 Correct 2 ms 340 KB Output is correct
21 Correct 4 ms 284 KB Output is correct
22 Correct 3 ms 340 KB Output is correct
23 Correct 2 ms 340 KB Output is correct
24 Correct 4 ms 340 KB Output is correct
25 Correct 4 ms 332 KB Output is correct
26 Correct 4 ms 340 KB Output is correct
27 Correct 4 ms 328 KB Output is correct
28 Correct 3 ms 468 KB Output is correct
29 Correct 5 ms 340 KB Output is correct
30 Correct 3 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 2 ms 340 KB Output is correct
33 Correct 1 ms 340 KB Output is correct
34 Correct 1 ms 340 KB Output is correct
35 Correct 0 ms 340 KB Output is correct
36 Correct 1 ms 600 KB Output is correct
37 Correct 1 ms 596 KB Output is correct
38 Correct 1 ms 596 KB Output is correct
39 Correct 631 ms 872 KB Output is correct
40 Correct 527 ms 1392 KB Output is correct
41 Correct 527 ms 1040 KB Output is correct
42 Correct 477 ms 828 KB Output is correct
43 Correct 291 ms 1096 KB Output is correct
44 Correct 403 ms 1372 KB Output is correct
45 Correct 522 ms 1544 KB Output is correct
46 Correct 552 ms 1504 KB Output is correct
47 Correct 509 ms 1644 KB Output is correct
48 Correct 545 ms 1604 KB Output is correct
49 Correct 325 ms 1144 KB Output is correct
50 Correct 501 ms 1544 KB Output is correct
51 Correct 496 ms 1652 KB Output is correct
52 Correct 90 ms 1504 KB Output is correct
53 Correct 107 ms 1492 KB Output is correct
54 Correct 72 ms 1136 KB Output is correct
55 Correct 62 ms 1444 KB Output is correct
56 Correct 2 ms 1492 KB Output is correct