Submission #873093

#	Time	Username	Problem	Language	Result	Execution time	Memory
873093		c2zi6	Money (IZhO17_money)	C++14	45 / 100	1563 ms	7320 KiB

money

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define replr(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define reprl(i, a, b) for (int i = int(a); i >= int(b); --i)
#define rep(i, n) for (int i = 0; i < int(n); ++i)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VPI;
typedef vector<VI> VVI;
typedef vector<VPI> VVPI;
typedef pair<ll, ll> PLL;
typedef vector<ll> VL;
typedef vector<PLL> VPL;
typedef vector<VL> VVL;
typedef vector<VPL> VVPL;
template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;}
template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;}

bool test(VVI& v) {
	set<int> st;
	for (VI a : v) {
		for (int i = 1; i < a.size(); i++) {
			if (a[i-1] > a[i]) return false;
		}

		auto it = st.upper_bound(a[0]);
		if (it != st.end() && *it < a.back()) return false;

		for (int x : a) st.insert(x);
	}
	return true;
}

int dandax(VI a) {
	VVI v;
	int n = a.size();
	int ret = n;
	for (int s = 0; s < (1<<n); s += 2) {
		v.clear();
		rep(i, n) {
			if (s & (1<<i)) v.back().pb(a[i]);
			else v.pb(VI{a[i]});
		}
		if (test(v)) setmin(ret, (int)v.size());
		continue;
		for (VI vec : v) {
			for (int x : vec) cout << x << " ";
			cout << "| ";
		} cout << (test(v) ? "TRUE" : "FALSE") << endl;
	}
	return ret;
}

int solve(VI a) {
	int n = a.size();

	vector<bool> ka(1e6+1);
	int ans = 1;
	ka[a[0]] = true;
	int s = 0;
	for (int i = 1; i < n; i++) {
		if (a[i] < a[i-1]) {
			/* cout << i+1 << " "; */
			ans++;
			for (int j = s; j < i; j++) ka[a[j]] = true;
			s = i;
		} else {
			bool fl = false;
			replr(j, a[s]+1, a[i]-1) fl |= ka[j];
			if (fl) {
				/* cout << i+1 << " "; */
				ans++;
				for (int j = s; j < i; j++) ka[a[j]] = true;
				s = i;
			}
		}
	}
	cout << endl;

	return ans;
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL), cout.tie(NULL);

	int n;
	cin >> n;
	VI a(n);
	for (int& x : a) cin >> x;
	int ans = solve(a);
	/* cout << ans << " " << dandax(a) << endl; */
	cout << endl << ans << endl;

}

Compilation message (stderr)

money.cpp: In function 'bool test(VVI&)':
money.cpp:29:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |   for (int i = 1; i < a.size(); i++) {
      |                   ~~^~~~~~~~~~

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