Submission #337143

#	Time	Username	Problem	Language	Result	Execution time	Memory
337143		deadeye	Global Warming (NOI13_gw)	C++17	19 / 40	222 ms	42128 KiB

gw

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define fi first
#define si second
typedef pair<int,int> pi;
 
#ifdef LOCAL
#define debug(...) __f(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) 69
#endif
template <typename Arg>
void __f(string name, Arg arg) {
	cerr << name << " = " << arg << endl;
}
template <typename Head, typename... Tail>
void __f(string names, Head head, Tail... tail) {
	string cur = "";
	for (auto ch: names){if(ch==','){break;}else{cur+=ch;}}
	string nxt = names.substr(cur.size()+2);
	cerr << cur << " = " << head << ", ";
	__f(nxt, tail...);
}
 
int N, ret, cur;
vector<int> v;
vector<pi> events;
 
int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin >> N;
	vector<int> A(N + 1);
	for (int i = 1; i <= N; ++i) cin >> A[i];
	for (int i = 1; i <= N; ++i) {
		if (A[i] != A[i - 1]) {
			v.pb(A[i]);
		}
	}
	int n = v.size();
	if (n == 1) {
		cout << 1;
		return 0;
	}
	for (int i = 1; i < n - 1; ++i) {
		if (v[i] > v[i - 1] && v[i] > v[i + 1]) {
			events.pb({v[i], 0});
		} else if (v[i] < v[i - 1] && v[i] < v[i + 1]) {
			events.pb({v[i], 1});
		}
	}
	if (v[0] > v[1]) events.pb({v[0], 0});
	if (v[n - 1] > v[n - 2]) events.pb({v[n - 1], 0});
	sort(events.begin(), events.end(), greater<pi>());
	for (auto i: events) {
		if (!i.si) cur += 1;
		else cur -= 1;
		ret = max(cur, ret);
	}
	cout << ret;
	return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 7 / 7
• Subtask 4: 0 / 10
• Subtask 5: 0 / 11