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Submission #464275

# Submission time Handle Problem Language Result Execution time Memory
464275 2021-08-12T16:31:50 Z gesgha Exam (eJOI20_exam) C++17
12 / 100
 1000 ms 1704 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define fr(x, l, r) for(int x = l; x <= r; x++)
#define rf(x, l, r) for(int x = l; x >= r; x--)
#define fe(x, y) for(auto& x : y)

#define fi first
#define se second
#define m_p make_pair
#define pb push_back
#define pw(x) (ull(1) << ull(x))
#define all(x) (x).begin(),x.end()
#define sz(x) (int)x.size()
#define mt make_tuple
#define ve vector

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair <ll,ll> pll;
typedef pair <int,int> pii;
typedef pair <ld,ld> pld;

template<typename T>
using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define fbo find_by_order
#define ook order_of_key

template<typename T>
bool umn(T& a, T b) { return a > b ? a = b, 1 : 0; }
template<typename T>
bool umx(T& a, T b) { return a < b ? a = b, 1 : 0; }

const ll inf = 1e18;
const int intf = 1e9;
const ll mod = 1e9 + 7;
const ld eps = 0.00000001;
const ll N  = 1e5 + 5;

int a[N], b[N], B, f[N], n, dp[N], ans;

queue <ll> q;

void add(int pos, int& ans){
    if(pos < 0 || pos >= n || f[pos] || a[pos] > B)return;
    ans++;
    f[pos] = 1;
    q.push(pos);
}

void rec(){

    int cnt = 0;
    fr(i, 0, n - 1){
        cnt += bool(a[i] == b[i]);
    }
    ans = max(ans, cnt);
    if(ans == n)return;
    fr(i, 0, n - 1){
        int c = a[i];
        if(i < n - 1 && umx(a[i], a[i + 1])){
            rec();
            if(ans == n)return;
            a[i] = c;
        }
        if(i && umx(a[i], a[i - 1])){
            rec();
            if(ans == n)return;
            a[i] = c;
        }
    }
}



int main(){

#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt","w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#else
//    freopen("mountains.in", "r", stdin);
//    freopen("mountains.out","w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
#endif
    cin >> n;

    fr(i, 0, n - 1){
        cin >> a[i];
    }
    bool ff = 0;
    fr(i, 0, n - 1){
        cin >> b[i];
        if(i && b[i] != b[i - 1]){
            ff = 1;
        }
    }
    if(!ff){
        int  ans = 0;
        B = b[0];
        fr(i, 0, n - 1){
            if(a[i] == B){
                q.push(i);
                f[i] = 1;
                ans++;
            }
        }

        while(!q.empty()){
            int p = q.front();
            add(p + 1, ans);
            add(p - 1, ans);
            q.pop();
        }
        cout << ans << endl;
    }
    else{
        rec();
        cout << ans << endl;
    }

    return 0;
}

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 50 ms 204 KB Output is correct
6 Execution timed out 1084 ms 204 KB Time limit exceeded

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 6 ms 472 KB Output is correct
3 Correct 21 ms 1160 KB Output is correct
4 Correct 16 ms 1448 KB Output is correct
5 Correct 32 ms 1372 KB Output is correct
6 Correct 16 ms 1704 KB Output is correct
7 Correct 18 ms 1524 KB Output is correct
8 Correct 24 ms 1116 KB Output is correct

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1083 ms 204 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1051 ms 580 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 50 ms 204 KB Output is correct
6 Execution timed out 1084 ms 204 KB Time limit exceeded

Subtask #6
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 50 ms 204 KB Output is correct
6 Execution timed out 1084 ms 204 KB Time limit exceeded