oj.uz

Submission #866152

# Submission time Handle Problem Language Result Execution time Memory
866152 2023-10-25T13:26:05 Z green_gold_dog Giraffes (JOI22_giraffes) C++17
59 / 100
 7000 ms 85084 KB 
//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx,avx2,sse,sse2,sse3,ssse3,sse4,abm,popcnt,mmx")
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef double db;
typedef long double ldb;
typedef complex<double> cd;

constexpr ll INF64 = 9'000'000'000'000'000'000, INF32 = 2'000'000'000, MOD = 1'000'000'007;
constexpr db PI = acos(-1);
constexpr bool IS_FILE = false, IS_TEST_CASES = false;

random_device rd;
mt19937 rnd32(rd());
mt19937_64 rnd64(rd());

template<typename T>
bool assign_max(T& a, T b) {
        if (b > a) {
                a = b;
                return true;
        }
        return false;
}

template<typename T>
bool assign_min(T& a, T b) {
        if (b < a) {
                a = b;
                return true;
        }
        return false;
}

template<typename T>
T square(T a) {
        return a * a;
}

template<>
struct std::hash<pair<ll, ll>> {
        ll operator() (pair<ll, ll> p) const {
                return ((__int128)p.first * MOD + p.second) % INF64;
        }
};

void solve() {
        ll n;
        cin >> n;
        vector<ll> arr(n);
        for (ll i = 0; i < n; i++) {
                cin >> arr[i];
                arr[i]--;
        }
        vector<vector<ll>> dp(n + 1, vector<ll>(n + 1, 0));
        for (ll i = 1; i <= n; i++) {
                vector<vector<ll>> ndp(n + 1, vector<ll>(n + 1, 0));
                for (ll j = 0; j < i; j++) {
                        for (ll k = 0; k < i; k++) {
                                assign_max(ndp[j][k], dp[j][k]);
                                assign_max(ndp[j + 1][k], dp[j][k]);
                                assign_max(ndp[j][k + 1], dp[j][k]);
                                assign_max(ndp[j + 1][k + 1], dp[j][k]);
                                if (arr[j] == k) {
                                        assign_max(ndp[j + 1][k + 1], dp[j][k] + 1);
                                }
                                if (arr[j] == n - (i - k)) {
                                        assign_max(ndp[j + 1][k], dp[j][k] + 1);
                                }
                                if (arr[n - (i - j)] == k) {
                                        assign_max(ndp[j][k + 1], dp[j][k] + 1);
                                }
                                if (arr[n - (i - j)] == n - (i - k)) {
                                        assign_max(ndp[j][k], dp[j][k] + 1);
                                }
                        }
                }
                dp = ndp;
        }
        ll ans = 0;
        for (auto i : dp) {
                for (auto j : i) {
                        assign_max(ans, j);
                }
        }
        cout << n - ans << '\n';
}

int main() {
        if (IS_FILE) {
                freopen("", "r", stdin);
                freopen("", "w", stdout);
        }
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        cout.tie(0);
        ll t = 1;
        if (IS_TEST_CASES) {
                cin >> t;
        }
        for (ll i = 0; i < t; i++) {
                solve();
        }
}

Compilation message

giraffes.cpp: In function 'int main()':
giraffes.cpp:94:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |                 freopen("", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~
giraffes.cpp:95:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |                 freopen("", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 348 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 0 ms 464 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 472 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 0 ms 464 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 472 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 2 ms 604 KB Output is correct
23 Correct 25 ms 1264 KB Output is correct
24 Correct 48 ms 1408 KB Output is correct
25 Correct 87 ms 1804 KB Output is correct
26 Correct 90 ms 1832 KB Output is correct
27 Correct 94 ms 2572 KB Output is correct
28 Correct 91 ms 1884 KB Output is correct
29 Correct 93 ms 2632 KB Output is correct
30 Correct 102 ms 1904 KB Output is correct

Subtask #4
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 0 ms 464 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 472 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 2 ms 604 KB Output is correct
23 Correct 25 ms 1264 KB Output is correct
24 Correct 48 ms 1408 KB Output is correct
25 Correct 87 ms 1804 KB Output is correct
26 Correct 90 ms 1832 KB Output is correct
27 Correct 94 ms 2572 KB Output is correct
28 Correct 91 ms 1884 KB Output is correct
29 Correct 93 ms 2632 KB Output is correct
30 Correct 102 ms 1904 KB Output is correct
31 Execution timed out 7038 ms 85084 KB Time limit exceeded
32 Halted 0 ms 0 KB -