Submission #950021

#	Time	Username	Problem	Language	Result	Execution time	Memory
950021		Pragmatism	Money (IZhO17_money)	C++17	45 / 100	1545 ms	9540 KiB

money

//Bismillahir-Rahmanir-Rahim

#include <bits/stdc++.h>
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("O1,O2,O3,Ofast,unroll-loops")
#pragma GCC target("sse,sse2,sse3,sse4,sse4.1,sse4.2,popcnt,avx,avx2")

#define pb push_back
#define pii pair <int, int>
#define pll pair <long long, long long>
#define pld pair <long double, long double>
#define ll long long
#define ld long double
#define x first
#define y second
#define all(v) v.begin(),v.end()
#define sz(s) (int)s.size()
#define skip continue
#define bpop(x) (ll)__builtin_popcountll(x)

using namespace std;

const int N = 1e6 + 7;
const int M = 1e5 + 7;
const int maxA = 1e5 + 7;
const int inf = 1e9 + 7;
const ll INF = 2e18 + 7;
const int MOD = 998244353;
const ld eps = 1e-9;

pii dir[] = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//clock_t start = clock();

//#define int long long

int n, a[N], cnt[N];
int calc() {
    for (int i = 1;i <= n;i++)cnt[a[i]] = 0;
    for (int i = 1;i <= n;i++)cnt[a[i]]++;
    int ans = 0;
    for (int i = 1;i <= n;) {
        int mxr = i;
        for (int r = i;r <= n;r++) {
            if (i < r && a[r - 1] < a[r])break;
            for (int pos = i;pos <= r;pos++)cnt[a[pos]]--;
            bool ok = 1;
            for (int x = a[i] - 1;x > a[r];x--)ok &= (!cnt[x]);
            for (int pos = i;pos <= r;pos++)cnt[a[pos]]++;
            if (!ok)break;
            mxr = max(mxr, r);
        }
        for (int pos = i;pos <= mxr;pos++)cnt[a[pos]]--;
        i = mxr + 1, ans++;
    }
    return ans;
}
void solve() {
    cin >> n;
    for (int i = 1;i <= n;i++)cin >> a[i];
    reverse(a + 1, a + n + 1);
    cout << calc();
}
signed main() {
    //srand(time(NULL));
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    //freopen("subsequence.in", "r", stdin);
    //freopen("subsequence.out", "w", stdout);
    int test = 1;
    //cin >> test;
    for (int t = 1;t <= test;t++) {
        //cout << "Case " << t << ": ";
        solve();
    }
    return 0;
}

Compilation message (stderr)

money.cpp:4: warning: ignoring '#pragma comment ' [-Wunknown-pragmas]
    4 | #pragma comment(linker, "/stack:200000000")
      |

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 0 / 55