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Submission #1104214

# Submission time Handle Problem Language Result Execution time Memory
1104214 2024-10-23T09:03:11 Z manhlinh1501 Exam (eJOI20_exam) C++17
77 / 100
 84 ms 101192 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];

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 left[MAXN];
    int right[MAXN];
    int cnt[MAXN];

    void solution() {
        if(is_subtask() == false) return;
        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]--;
        }
        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 {
    const int LOGN = 20;
    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;
    }

    void solution() {
        if(is_subtask() == false) return;
        exit(0);
    }
}

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

    int dp[MAXN][MAXN];
    int left[MAXN];
    int right[MAXN];

    bool is_subtask() {
        return N < MAXN;
    }

    void solution() {
        if(is_subtask() == false) return;
        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]--;
        }
        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();
    subtask2::solution();
    subtask3::solution();
//    subtask4::solution();
    subtask6::solution();
    return (0 ^ 0);
}

Compilation message

exam.cpp: In function 'int main()':
exam.cpp:156:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  156 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
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".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB Output is correct
2 Correct 1 ms 2384 KB Output is correct
3 Correct 1 ms 2384 KB Output is correct
4 Correct 1 ms 2384 KB Output is correct
5 Correct 1 ms 2384 KB Output is correct
6 Correct 1 ms 2384 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4432 KB Output is correct
2 Correct 5 ms 4432 KB Output is correct
3 Correct 29 ms 9040 KB Output is correct
4 Correct 11 ms 4948 KB Output is correct
5 Correct 64 ms 9560 KB Output is correct
6 Correct 11 ms 4944 KB Output is correct
7 Correct 15 ms 4944 KB Output is correct
8 Correct 58 ms 7752 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB Output is correct
2 Correct 3 ms 4944 KB Output is correct
3 Correct 14 ms 21784 KB Output is correct
4 Correct 47 ms 73900 KB Output is correct
5 Correct 55 ms 77896 KB Output is correct
6 Correct 50 ms 77896 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 66 ms 100528 KB Output is correct
2 Incorrect 37 ms 4448 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 2384 KB Output is correct
2 Correct 1 ms 2384 KB Output is correct
3 Correct 1 ms 2384 KB Output is correct
4 Correct 1 ms 2384 KB Output is correct
5 Correct 1 ms 2384 KB Output is correct
6 Correct 1 ms 2384 KB Output is correct
7 Correct 1 ms 2384 KB Output is correct
8 Correct 1 ms 2640 KB Output is correct
9 Correct 1 ms 2896 KB Output is correct
10 Correct 2 ms 3408 KB Output is correct
11 Correct 2 ms 3408 KB Output is correct
12 Correct 2 ms 3408 KB Output is correct
13 Correct 2 ms 3576 KB Output is correct
14 Correct 2 ms 3408 KB Output is correct

Subtask #6
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2384 KB Output is correct
2 Correct 1 ms 2384 KB Output is correct
3 Correct 1 ms 2384 KB Output is correct
4 Correct 1 ms 2384 KB Output is correct
5 Correct 1 ms 2384 KB Output is correct
6 Correct 1 ms 2384 KB Output is correct
7 Correct 1 ms 2384 KB Output is correct
8 Correct 3 ms 4944 KB Output is correct
9 Correct 14 ms 21784 KB Output is correct
10 Correct 47 ms 73900 KB Output is correct
11 Correct 55 ms 77896 KB Output is correct
12 Correct 50 ms 77896 KB Output is correct
13 Correct 1 ms 2384 KB Output is correct
14 Correct 1 ms 2640 KB Output is correct
15 Correct 1 ms 2896 KB Output is correct
16 Correct 2 ms 3408 KB Output is correct
17 Correct 2 ms 3408 KB Output is correct
18 Correct 2 ms 3408 KB Output is correct
19 Correct 2 ms 3576 KB Output is correct
20 Correct 2 ms 3408 KB Output is correct
21 Correct 2 ms 3660 KB Output is correct
22 Correct 9 ms 10320 KB Output is correct
23 Correct 2 ms 4432 KB Output is correct
24 Correct 79 ms 100424 KB Output is correct
25 Correct 84 ms 100328 KB Output is correct
26 Correct 65 ms 100432 KB Output is correct
27 Correct 61 ms 100936 KB Output is correct
28 Correct 55 ms 101192 KB Output is correct
29 Correct 57 ms 77984 KB Output is correct
30 Correct 57 ms 100708 KB Output is correct
31 Correct 60 ms 100680 KB Output is correct
32 Correct 52 ms 101192 KB Output is correct