Submission #603328

#	Time	Username	Problem	Language	Result	Execution time	Memory
603328		tamthegod	Money (IZhO17_money)	C++14	0 / 100	25 ms	8148 KiB

money

#include<bits/stdc++.h>

#define int long long
#define pb push_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e6 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e18;
int n, a[maxN];
int bit[maxN];
void update(int pos, int val)
{
    while(pos < maxN)
    {
        bit[pos] += val;
        pos += (pos & (-pos));
    }
}
int get(int pos)
{
    int res = 0;
    while(pos)
    {
        res += bit[pos];
        pos -= (pos & (-pos));
    }
    return res;
}
void ReadInput()
{
    cin >> n;
    for(int i=1; i<=n; i++) cin >> a[i];
}
void Solve()
{
    for(int i=1; i<maxN; i++) update(i, 1);
    int res = 1;
    for(int i=1; i<=n; i++)
    {
        update(a[i], -1);
        if(a[i] < a[i - 1])
        {
            res++;
            continue;
        }
        if(a[i] == a[i - 1]) continue;
        if(get(a[i] - 1) - get(a[i - 1]) != (a[i] - a[i - 1] - 1)) res++;
    }
    cout << res;
}
int32_t main()
{
   // freopen("x.inp", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ReadInput();
    Solve();
}

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