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Submission #1104224

# Submission time Handle Problem Language Result Execution time Memory
1104224 2024-10-23T09:33:07 Z manhlinh1501 Exam (eJOI20_exam) C++17
77 / 100
 81 ms 103248 KB 
#include<bits/stdc++.h>
using namespace std;
using i64 = long long;
const int MAXN = 2e5 + 5;
#define left ___left
#define right ___right
#define ALL(a) (a).begin(), (a).end()

using pii = pair<int, int>;
int N;
int a[MAXN];
int b[MAXN];
int left[MAXN];
int right[MAXN];

void compress() {
    map<int, int> comp;
    for(int i = 1; i <= N; i++) comp[a[i]] = 1;
    for(int i = 1; i <= N; i++) comp[b[i]] = 1;
    int c = 0;
    for(auto &[x, y] : comp) y = ++c;
    for(int i = 1; i <= N; i++) a[i] = comp[a[i]];
    for(int i = 1; i <= N; i++) b[i] = comp[b[i]];
}

namespace subtask2 {
    bool is_subtask() {
        for(int i = 1; i < N; i++) {
            if(b[i] != b[i + 1]) return false;
        }
        return true;
    }
    int cnt[MAXN];

    void solution() {
        if(is_subtask() == false) return;
        for(int i = 1; i <= N; i++) {
            if(a[i] == b[i]) {
                cnt[left[i]]++;
                cnt[right[i] + 1]--;
            }
        }
        for(int i = 1; i <= N; i++) cnt[i] += cnt[i - 1];
        int ans = 0;
        for(int i = 1; i <= N; i++) ans += (cnt[i] > 0);
        cout << ans;
        exit(0);
    }
}

namespace subtask3 {
    const int MAXN = 5e3 + 5;
    bool is_subtask() {
        return is_sorted(a + 1, a + N + 1);
    }
    int dp[MAXN][MAXN];

    void solution() {
        if(is_subtask() == false) return;
        for(int i = 1; i <= N; i++) {
            for(int j = 1; j <= i; j++) {
                dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
                if(a[i] == b[j])
                    dp[i][j] = max(dp[i][j], max(dp[i - 1][j - 1], dp[i][j - 1]) + 1);
            }
        }
        int ans = 0;
        for(int i = 1; i <= N; i++) {
            for(int j = 1; j <= i; j++)
                ans = max(ans, dp[i][j]);
        }
        cout << ans;
        exit(0);
    }
}

namespace subtask4 {
    bool is_subtask() {
        vector<int> b;
        for(int i = 1; i <= N; i++) b.emplace_back(a[i]);
        sort(ALL(b));
        for(int i = 1; i < N; i++) {
            if(b[i] == b[i - 1]) return false;
        }
        return true;
    }

    namespace BIT {
        int N;
        int tree[MAXN];

        void init(int _N) {
            N = _N;
        }
        void update(int x, int v) {
            for(; x <= N; x += (x & -x))
                tree[x] = max(tree[x], v);
        }

        int get(int x) {
            int res = 0;
            for(; x; x -= (x & -x))
                res = max(res, x);
            return res;
        }
    }

    int pos[MAXN];

    void solution() {
        if(is_subtask() == false) return;
        BIT::init(N);
        for(int i = 1; i <= N; i++) pos[a[i]] = i;
        int ans = 0;
        for(int i = 1; i <= N; i++) {
            int p = pos[b[i]];
            if(p == 0) continue;
            if(left[i] <= p and p <= right[i])
                BIT::update(i, BIT::get(p) + 1);
        }
        cout << ans;
        exit(0);
    }
}

namespace subtask6 {
    const int MAXN = 5e3 + 5;

    int dp[MAXN][MAXN];

    bool is_subtask() {
        return N < MAXN;
    }

    void solution() {
        if(is_subtask() == false) return;
        for(int i = 1; i <= N; i++) {
            for(int j = 1; j <= N; j++) {
                dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
                if(a[i] == b[j] and left[i] <= j and j <= right[i])
                    dp[i][j] = max(dp[i][j], max(dp[i - 1][j - 1], dp[i][j - 1]) + 1);
            }
        }
        int ans = 0;
        for(int i = 1; i <= N; i++) {
            for(int j = 1; j <= N; j++)
                ans = max(ans, dp[i][j]);
        }
        cout << ans;
        exit(0);
    }
}

signed main() {
#define task "code"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> N;
    for(int i = 1; i <= N; i++) cin >> a[i];
    for(int i = 1; i <= N; i++) cin >> b[i];
    compress();
    for(int i = 1; i <= N; i++) {
        left[i] = i - 1;
        while(left[i] > 0 and a[left[i]] <= a[i])
            left[i] = left[left[i]];
    }
    for(int i = N; i >= 1; i--) {
        right[i] = i + 1;
        while(right[i] <= N and a[right[i]] <= a[i])
            right[i] = right[right[i]];
    }
    for(int i = 1; i <= N; i++) {
        left[i]++;
        right[i]--;
    }
    subtask2::solution();
    subtask3::solution();
    subtask6::solution();
    subtask4::solution();
    return (0 ^ 0);
}

Compilation message

exam.cpp: In function 'int main()':
exam.cpp:157:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  157 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
exam.cpp:158:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  158 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4432 KB Output is correct
2 Correct 1 ms 4480 KB Output is correct
3 Correct 2 ms 4688 KB Output is correct
4 Correct 1 ms 4432 KB Output is correct
5 Correct 1 ms 4432 KB Output is correct
6 Correct 1 ms 4432 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4432 KB Output is correct
2 Correct 5 ms 4432 KB Output is correct
3 Correct 31 ms 8660 KB Output is correct
4 Correct 9 ms 4432 KB Output is correct
5 Correct 62 ms 9252 KB Output is correct
6 Correct 11 ms 4432 KB Output is correct
7 Correct 15 ms 4432 KB Output is correct
8 Correct 57 ms 7496 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4432 KB Output is correct
2 Correct 3 ms 6992 KB Output is correct
3 Correct 15 ms 23888 KB Output is correct
4 Correct 47 ms 76104 KB Output is correct
5 Correct 44 ms 78192 KB Output is correct
6 Correct 45 ms 78060 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 57 ms 102556 KB Output is correct
2 Incorrect 38 ms 10536 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4432 KB Output is correct
2 Correct 1 ms 4480 KB Output is correct
3 Correct 2 ms 4688 KB Output is correct
4 Correct 1 ms 4432 KB Output is correct
5 Correct 1 ms 4432 KB Output is correct
6 Correct 1 ms 4432 KB Output is correct
7 Correct 1 ms 4596 KB Output is correct
8 Correct 1 ms 4688 KB Output is correct
9 Correct 1 ms 4944 KB Output is correct
10 Correct 2 ms 5456 KB Output is correct
11 Correct 2 ms 5456 KB Output is correct
12 Correct 2 ms 5456 KB Output is correct
13 Correct 2 ms 5456 KB Output is correct
14 Correct 2 ms 5456 KB Output is correct

Subtask #6
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4432 KB Output is correct
2 Correct 1 ms 4480 KB Output is correct
3 Correct 2 ms 4688 KB Output is correct
4 Correct 1 ms 4432 KB Output is correct
5 Correct 1 ms 4432 KB Output is correct
6 Correct 1 ms 4432 KB Output is correct
7 Correct 1 ms 4432 KB Output is correct
8 Correct 3 ms 6992 KB Output is correct
9 Correct 15 ms 23888 KB Output is correct
10 Correct 47 ms 76104 KB Output is correct
11 Correct 44 ms 78192 KB Output is correct
12 Correct 45 ms 78060 KB Output is correct
13 Correct 1 ms 4596 KB Output is correct
14 Correct 1 ms 4688 KB Output is correct
15 Correct 1 ms 4944 KB Output is correct
16 Correct 2 ms 5456 KB Output is correct
17 Correct 2 ms 5456 KB Output is correct
18 Correct 2 ms 5456 KB Output is correct
19 Correct 2 ms 5456 KB Output is correct
20 Correct 2 ms 5456 KB Output is correct
21 Correct 2 ms 5456 KB Output is correct
22 Correct 8 ms 12368 KB Output is correct
23 Correct 2 ms 4432 KB Output is correct
24 Correct 81 ms 102984 KB Output is correct
25 Correct 56 ms 103108 KB Output is correct
26 Correct 53 ms 102472 KB Output is correct
27 Correct 53 ms 102984 KB Output is correct
28 Correct 57 ms 102676 KB Output is correct
29 Correct 46 ms 78152 KB Output is correct
30 Correct 60 ms 102548 KB Output is correct
31 Correct 52 ms 103248 KB Output is correct
32 Correct 65 ms 102476 KB Output is correct