Submission #957075

#	Time	Username	Problem	Language	Result	Execution time	Memory
957075		Mher777	Sequence (APIO23_sequence)	C++17	0 / 100	2060 ms	15488 KiB

sequence

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <iomanip>
#include <array>
#include <string>
#include <algorithm>
#include <cmath>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <utility>
#include <random>
#include <cassert>
#include <fstream>
#include "sequence.h"
using namespace std;
mt19937 rnd(7069);
typedef int itn;
typedef long long ll;
typedef unsigned long long ull;
typedef double db;
typedef float fl;
typedef long double ld;
using vi = vector<int>;
using vll = vector<ll>;
using mii = map<int, int>;
using mll = map<ll, ll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#define ff first
#define ss second
#define pub push_back
#define pob pop_back
#define puf push_front
#define pof pop_front
#define mpr make_pair
#define yes cout<<"Yes\n"
#define no cout<<"No\n"
#define all(x) (x).begin(), (x).end()
const int MAX = int(2e9 + 5);
const ll MAXL = ll(1e18) + 5ll;

const int N = 500005;
int a[N], t[N];
pii id[N];
int n, m, ans = 1;

void add(int ind, int val) {
    while (ind <= n) {
        t[ind] += val;
        ind += (ind & -ind);
    }
}

int sum(int ind) {
    int ret = 0;
    while (ind) {
        ret += t[ind];
        ind -= (ind & -ind);
    }
    return ret;
}

int qry(int l, int r) {
    return abs(sum(r) - sum(l - 1));
}

int sequence(int N, std::vector<int> A) {
    n = N;
    for (int i = 1; i <= n; ++i) {
        a[i] = A[i - 1];
        if (!id[a[i]].ff) id[a[i]].ff = i;
        id[a[i]].ss = i;
        if (a[i] > 1) add(i, 1);
    }
    for (int i = 1; i <= n; ++i) {
        int num = 0;
        if (!id[i].ff || id[i].ff == id[i].ss) continue;
        for (int j = id[i].ff + 1; j < id[i].ss; ++j) {
            if (a[j] > i) ++num;
            else --num;
        }
        if (abs(num) <= 2) return 2;
    }
    return 1;
}

/*
14
2 6 2 5 3 4 2 1 4 3 5 6 3 2
*/

• Subtask 1: 0 / 11
• Subtask 2: 0 / 17
• Subtask 3: 0 / 7
• Subtask 4: 0 / 12
• Subtask 5: 0 / 13
• Subtask 6: 0 / 22
• Subtask 7: 0 / 18