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Submission #1104227

# Submission time Handle Problem Language Result Execution time Memory
1104227 2024-10-23T09:37:49 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;
            if(left[p] <= i and i <= right[p])
                BIT::update(p, 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 4432 KB Output is correct
3 Correct 2 ms 4432 KB Output is correct
4 Correct 2 ms 4432 KB Output is correct
5 Correct 1 ms 4600 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 1 ms 4432 KB Output is correct
2 Correct 5 ms 4432 KB Output is correct
3 Correct 33 ms 8784 KB Output is correct
4 Correct 14 ms 4444 KB Output is correct
5 Correct 73 ms 9064 KB Output is correct
6 Correct 12 ms 4432 KB Output is correct
7 Correct 17 ms 4432 KB Output is correct
8 Correct 65 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 18 ms 24028 KB Output is correct
4 Correct 49 ms 76104 KB Output is correct
5 Correct 49 ms 78212 KB Output is correct
6 Correct 50 ms 78152 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 103240 KB Output is correct
2 Incorrect 42 ms 10312 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 2 ms 4432 KB Output is correct
4 Correct 2 ms 4432 KB Output is correct
5 Correct 1 ms 4600 KB Output is correct
6 Correct 1 ms 4432 KB Output is correct
7 Correct 1 ms 4432 KB Output is correct
8 Correct 1 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 2 ms 5624 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 4432 KB Output is correct
3 Correct 2 ms 4432 KB Output is correct
4 Correct 2 ms 4432 KB Output is correct
5 Correct 1 ms 4600 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 18 ms 24028 KB Output is correct
10 Correct 49 ms 76104 KB Output is correct
11 Correct 49 ms 78212 KB Output is correct
12 Correct 50 ms 78152 KB Output is correct
13 Correct 1 ms 4432 KB Output is correct
14 Correct 1 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 2 ms 5624 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 9 ms 12368 KB Output is correct
23 Correct 2 ms 4432 KB Output is correct
24 Correct 88 ms 103148 KB Output is correct
25 Correct 60 ms 103104 KB Output is correct
26 Correct 53 ms 102304 KB Output is correct
27 Correct 58 ms 102984 KB Output is correct
28 Correct 58 ms 102472 KB Output is correct
29 Correct 52 ms 78160 KB Output is correct
30 Correct 66 ms 102472 KB Output is correct
31 Correct 65 ms 102472 KB Output is correct
32 Correct 65 ms 102480 KB Output is correct