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Submission #1104222

# Submission time Handle Problem Language Result Execution time Memory
1104222 2024-10-23T09:30:48 Z manhlinh1501 Exam (eJOI20_exam) C++17
77 / 100
 88 ms 103240 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;
            int x = BIT::get(p) + 1;
            BIT::update(p, x);
            if(left[p] <= i and i <= right[p])
                ans = max(ans, x);
        }
        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:159:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  159 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
exam.cpp:160:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  160 |         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 4432 KB Output is correct
3 Correct 1 ms 4432 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 8 ms 4432 KB Output is correct
3 Correct 36 ms 8776 KB Output is correct
4 Correct 10 ms 4600 KB Output is correct
5 Correct 70 ms 9032 KB Output is correct
6 Correct 13 ms 4432 KB Output is correct
7 Correct 16 ms 4432 KB Output is correct
8 Correct 64 ms 7496 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4432 KB Output is correct
2 Correct 5 ms 6992 KB Output is correct
3 Correct 16 ms 23888 KB Output is correct
4 Correct 54 ms 76108 KB Output is correct
5 Correct 51 ms 78076 KB Output is correct
6 Correct 49 ms 78152 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 103240 KB Output is correct
2 Incorrect 43 ms 10324 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 4432 KB Output is correct
3 Correct 1 ms 4432 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 2 ms 4688 KB Output is correct
9 Correct 2 ms 4944 KB Output is correct
10 Correct 2 ms 5456 KB Output is correct
11 Correct 3 ms 5456 KB Output is correct
12 Correct 3 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 4432 KB Output is correct
3 Correct 1 ms 4432 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 2 ms 4432 KB Output is correct
8 Correct 5 ms 6992 KB Output is correct
9 Correct 16 ms 23888 KB Output is correct
10 Correct 54 ms 76108 KB Output is correct
11 Correct 51 ms 78076 KB Output is correct
12 Correct 49 ms 78152 KB Output is correct
13 Correct 1 ms 4432 KB Output is correct
14 Correct 2 ms 4688 KB Output is correct
15 Correct 2 ms 4944 KB Output is correct
16 Correct 2 ms 5456 KB Output is correct
17 Correct 3 ms 5456 KB Output is correct
18 Correct 3 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 3 ms 5456 KB Output is correct
22 Correct 10 ms 12368 KB Output is correct
23 Correct 2 ms 4432 KB Output is correct
24 Correct 88 ms 103096 KB Output is correct
25 Correct 66 ms 103116 KB Output is correct
26 Correct 67 ms 102304 KB Output is correct
27 Correct 71 ms 102472 KB Output is correct
28 Correct 80 ms 102472 KB Output is correct
29 Correct 50 ms 78064 KB Output is correct
30 Correct 69 ms 103240 KB Output is correct
31 Correct 73 ms 102604 KB Output is correct
32 Correct 71 ms 102472 KB Output is correct