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Submission #1031582

# Submission time Handle Problem Language Result Execution time Memory
1031582 2024-07-23T01:44:14 Z orcslop Global Warming (CEOI18_glo) C++17
100 / 100
 247 ms 45496 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
using ll = long long; 
#define pb push_back
#define all(x) begin(x), end(x)
#define sz(x) (int) (x).size()

struct chash {
    const uint64_t C = uint64_t(6283185307179586476) + 71;
    const uint32_t RANDOM = chrono::steady_clock::now().time_since_epoch().count();
    size_t operator()(uint64_t x) const {
        return __builtin_bswap64((x ^ RANDOM) * C);
    }
};

template <class K, class V> using ht = gp_hash_table
<K, V, /*hash<K> for undefined chash*/ chash, 
equal_to<K>, direct_mask_range_hashing<>, linear_probe_fn<>,
hash_standard_resize_policy<hash_exponential_size_policy<>,
hash_load_check_resize_trigger<>, true>>;

template <class T> class segtree {
  private:
    const T DEFAULT = 0;
    vector<T> tree;
    int n;

  public:
    segtree(int n) : n(n), tree(n * 2, DEFAULT) {}

    void reset(){
        tree = vector<int> (2 * n, DEFAULT); 
    }

    void update(int k, T val) {
        k += n;
        tree[k] = val; 
        for (k /= 2; k >= 1; k /= 2) {
            tree[k] = max(tree[2 * k], tree[2 * k + 1]); 
        }
    }

    T query(int a, int b) {
        T s = DEFAULT;
        for (a += n, b += n; a <= b; a /= 2, b /= 2) {
            if (a % 2 == 1) { s = max(s, tree[a++]); }
            if (b % 2 == 0) { s = max(s, tree[b--]); }
        }
        return s;
    }
};

const int MAXN = 2e5 + 5; 

int n, d; 
int v[MAXN]; 
int ps[MAXN]; 
int ss[MAXN]; 
vector<int> cc; 
ht<int, int> mp; 

int32_t main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> d; 
    for(int i = 0; i < n; i++){
        cin >> v[i]; 
        cc.pb(v[i]); 
        cc.pb(v[i] - d); 
        cc.pb(v[i] + d); 
    }
    sort(all(cc)); 
    cc.erase(unique(all(cc)), cc.end()); 
    for(int i = 0; i < sz(cc); i++){
        mp[cc[i]] = i; 
    }
    segtree<int> tree(sz(cc) + 2); 
    for(int i = 0; i < n; i++){
        int curr = mp[v[i]]; 
        ps[i] = tree.query(0, curr - 1) + 1; 
        if(tree.query(curr, curr) < ps[i]) {
            tree.update(curr, ps[i]); 
        }
    }
    tree.reset(); 
    for(int i = n - 1; i >= 0; i--){
        int curr = mp[v[i]]; 
        ss[i] = tree.query(curr + 1, sz(cc) - 1) + 1; 
        if(tree.query(curr, curr) < ss[i]){
            tree.update(curr, ss[i]); 
        }
    }
    tree.reset(); 
    int ans = 0; 
    for(int i = n - 1; i >= 0; i--){
        ans = max(ans, ps[i] + tree.query(mp[v[i] - d] + 1, sz(cc) - 1)); 
        if(tree.query(mp[v[i]], mp[v[i]]) < ss[i]){
            tree.update(mp[v[i]], ss[i]); 
        }
    }
    cout << ans << '\n'; 
    // for(int i = 0; i < n; i++){
        // cout << ss[i] << ' '; 
    // }    
    return 0; 
}

Compilation message

glo.cpp: In instantiation of 'segtree<T>::segtree(int) [with T = int]':
glo.cpp:78:33:   required from here
glo.cpp:28:9: warning: 'segtree<int>::n' will be initialized after [-Wreorder]
   28 |     int n;
      |         ^
glo.cpp:27:15: warning:   'std::vector<int> segtree<int>::tree' [-Wreorder]
   27 |     vector<T> tree;
      |               ^~~~
glo.cpp:31:5: warning:   when initialized here [-Wreorder]
   31 |     segtree(int n) : n(n), tree(n * 2, DEFAULT) {}
      |     ^~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 604 KB Output is correct
20 Correct 1 ms 604 KB Output is correct
21 Correct 1 ms 604 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 1 ms 604 KB Output is correct
24 Correct 1 ms 604 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 1 ms 604 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 171 ms 17684 KB Output is correct
2 Correct 167 ms 17596 KB Output is correct
3 Correct 162 ms 17600 KB Output is correct
4 Correct 162 ms 17600 KB Output is correct
5 Correct 88 ms 12224 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 11728 KB Output is correct
2 Correct 52 ms 11724 KB Output is correct
3 Correct 53 ms 11608 KB Output is correct
4 Correct 27 ms 6868 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 25 ms 4568 KB Output is correct
7 Correct 41 ms 7124 KB Output is correct

Subtask #6
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 108 ms 22992 KB Output is correct
2 Correct 102 ms 22988 KB Output is correct
3 Correct 244 ms 45492 KB Output is correct
4 Correct 130 ms 26300 KB Output is correct
5 Correct 88 ms 22464 KB Output is correct
6 Correct 175 ms 44468 KB Output is correct
7 Correct 177 ms 45236 KB Output is correct
8 Correct 98 ms 22976 KB Output is correct

Subtask #7
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 1 ms 604 KB Output is correct
20 Correct 1 ms 604 KB Output is correct
21 Correct 1 ms 604 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 1 ms 604 KB Output is correct
24 Correct 1 ms 604 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 1 ms 604 KB Output is correct
27 Correct 171 ms 17684 KB Output is correct
28 Correct 167 ms 17596 KB Output is correct
29 Correct 162 ms 17600 KB Output is correct
30 Correct 162 ms 17600 KB Output is correct
31 Correct 88 ms 12224 KB Output is correct
32 Correct 49 ms 11728 KB Output is correct
33 Correct 52 ms 11724 KB Output is correct
34 Correct 53 ms 11608 KB Output is correct
35 Correct 27 ms 6868 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 25 ms 4568 KB Output is correct
38 Correct 41 ms 7124 KB Output is correct
39 Correct 108 ms 22992 KB Output is correct
40 Correct 102 ms 22988 KB Output is correct
41 Correct 244 ms 45492 KB Output is correct
42 Correct 130 ms 26300 KB Output is correct
43 Correct 88 ms 22464 KB Output is correct
44 Correct 175 ms 44468 KB Output is correct
45 Correct 177 ms 45236 KB Output is correct
46 Correct 98 ms 22976 KB Output is correct
47 Correct 109 ms 22980 KB Output is correct
48 Correct 106 ms 22836 KB Output is correct
49 Correct 247 ms 45492 KB Output is correct
50 Correct 121 ms 26284 KB Output is correct
51 Correct 93 ms 14272 KB Output is correct
52 Correct 126 ms 17088 KB Output is correct
53 Correct 206 ms 44860 KB Output is correct
54 Correct 207 ms 45496 KB Output is correct
55 Correct 182 ms 27072 KB Output is correct