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Submission #888270

# Submission time Handle Problem Language Result Execution time Memory
888270 2023-12-16T18:59:50 Z drAKu Money (IZhO17_money) C++17
0 / 100
 2 ms 4444 KB 
#include <bits/stdc++.h>

using namespace std;

using ll = long long;

mt19937 rng(228);
const int N = 1e6 + 1;
int a[N], ans[N];
const int G = (1 << 20);
int t[2 * G];
int get(int ql, int qr) {
    int ans = 0;
    for (ql += G, qr += G; ql <= qr; ql >>= 1, qr >>= 1) {
        if (ql & 1) ans ^= t[ql++];
        if (~qr & 1) ans ^= t[qr--];
    }
    return ans;
}
void upd(int ql, int val) {
    for (ql += G, t[ql] ^= val, ql >>= 1; ql; ql >>= 1) t[ql] = t[ql << 1] ^ t[ql << 1 | 1];
}

signed main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) cin >> a[i];
    for (int i = 1; i < n; i++) {
        if (a[i-1] > a[i]) continue;
        if (a[i-1] == a[i] || a[i] == a[i-1] + 1) {
            ans[i] = 1;
            if (ans[i-1] == 1 && a[i-1] + 1 <= a[i] - 1) {
                int t = rng();
                upd(a[i-2] + 1, t);
                upd(a[i] - 1, t);
            }
            continue;
        }
        int good = get(a[i-1], a[i]);
        if (good == 0) {
            ans[i] = 1;
            int t = rng();
            upd(a[i-1] + 1, t);
            upd(a[i] - 1, t);
            if (ans[i-1] == 1) {
                t = rng();
                upd(a[i-2] + 1, t);
                upd(a[i] - 1, t);
            }
        }
    }
    cout << n - accumulate(ans, ans + N, 0) << "\n";
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4440 KB Output is correct
2 Incorrect 2 ms 4444 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4440 KB Output is correct
2 Incorrect 2 ms 4444 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4440 KB Output is correct
2 Incorrect 2 ms 4444 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 55.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4440 KB Output is correct
2 Incorrect 2 ms 4444 KB Output isn't correct
3 Halted 0 ms 0 KB -