Submission #338549

#	Time	Username	Problem	Language	Result	Execution time	Memory
338549		IZhO_2021_I_want_Silver	Money (IZhO17_money)	C++14	100 / 100	353 ms	19072 KiB

money

#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <set>
#include <map>
#include <iomanip>
#include <cassert>
#include <stack>
#include <queue>
#include <deque>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

// template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//  order_of_key (k) : Number of items strictly smaller than k .
//  find_by_order(k) : K-th element in a set (counting from zero).
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define pb push_back
#define ppb pop_back
#define mkp make_pair
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define show(a) cerr << #a <<" -> "<< a <<" "
#define nl cerr <<"\n"
//#define int ll

const int N = (1 << 20) - 1;
const int oo = 1e9 + 5;

int n, a[N], ans, t[N*2];

void upd(int pos, int x) {
    pos += N;
    t[pos] += x;
    while ((pos /= 2) >= 1) { t[pos] = t[pos*2] + t[pos*2+1]; }
}

int get(int l, int r) {
    int res = 0;
    for (l += N, r += N; l <= r; l /= 2, r /= 2) {
        if (l % 2 == 1) { res += t[l++]; }
        if (r % 2 == 0) { res += t[r--]; }
        if (l > r) { break; }
    }
    return res;
}

void solve() {
    cin >> n;
    for (int i = 1; i <= n; ++i) {
        cin >> a[i];
    }
    for (int l = 1; l <= n; ++l) {
        int r = l;
        while (r+1<=n && a[r] <= a[r+1] && get(a[l]+1, a[r+1]-1) == 0) { ++r; }
        for (int i = l; i <= r; ++i) { upd(a[i], 1); }
        l = r;
        ++ans;
    }
    cout << ans;
}

 main () {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int tests = 1;
	//cin >> tests;
	while (tests --) {
		solve();
	}
	return 0;
}
/*
    Just Chalish!
*/

Compilation message (stderr)

money.cpp:74:8: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   74 |  main () {
      |        ^

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