Submission #706603

#TimeUsernameProblemLanguageResultExecution timeMemory
706603Shreyan_PaliwalMoney (IZhO17_money)C++17
100 / 100
341 ms15028 KiB
#include <bits/stdc++.h>
using namespace std;

const int maxn = 1e6;

int n;
int a[maxn + 5];

int bit[maxn + 1];
void upd(int k, int v) {
    for ( ; k <= maxn; k += (k & -k))
        bit[k] += v;
}
int qry(int k) {
    int ret = 0;
    for (; k; k -= (k & -k))
        ret += bit[k];
    return ret;
}

int main() {
    // freopen("main.in", "r", stdin);

    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> a[i];


    // figure out nondecreasing sequences
    int l = 0;  
    int ans = 0;
    for (int i = 0; i < n; i++) {
        // either a[i + 1] < a[i] or element in range

        if ((i == n - 1 || a[i + 1] < a[i]) || (a[i + 1] > a[l] && qry(a[i + 1] - 1) - qry(a[l]))) {
            for (int j = l; j <= i; j++) upd(a[j], 1);
            ans++;
            l = i + 1;
        }

        // if (i == n - 1 || a[i + 1] < a[i]) {
        //     // [l, i]
        //     int L = l;
        //     for (int j = l + 1; j <= i; j++) {
        //         // cout << l << ' ' << i << ' ' << L << ' ' << j << endl;
        //         // cout << qry(a[j]-1) << ' ' << qry(a[L]-1) << endl;
                
        //         if (a[j] > a[L] && qry(a[j] - 1) - qry(a[L])) {
        //             ans++;
        //             L = j + 1; j++;
        //         }
        //     }
            
        //     for (int k = l; k <= i; k++) {
        //         upd(a[k], 1);
        //     }

        //     ans++;
        //     l = i + 1;
        // }
    }

    cout << ans << endl;

    return 0;
}
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