Submission #933830

#	Time	Username	Problem	Language	Result	Execution time	Memory
933830		Bzslayed	Global Warming (NOI13_gw)	C++17	40 / 40	179 ms	21692 KiB

gw

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
 
using namespace std;
using namespace __gnu_pbds; 
 
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
 
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define pff pair<float, float>
#define coutpair(p) cout << p.first << " " << p.second << "\n"
 
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_multiset;

const ll MAXN = 30000005;
ll dp[MAXN];

int main(){
    ios_base::sync_with_stdio(0); 
    cin.tie(0); 
    cout.tie(0);
 
	ll n; cin >> n;
	int prev = -1;
	vector<pii> v;
	int cur = 0;
	int arr[n];
	for (int i=0; i<n; i++){
		int a; cin >> a;
		if (prev == a) continue;
		v.push_back({a, cur});
		prev = a;
		arr[cur] = a;
		cur++;
	}
	sort(v.begin(), v.end(), greater<pii>());
	if (v.size() == 1) {
		cout << 1;
		return 0;
	}
	int curans = 0;
	int ans = 0;
	for (int i = 0; i < cur; i++) {
		pii c = v[i];
		if (c.second == cur-1){
			if (arr[c.second-1] <= c.first) curans++;
		} 
        else if (c.second == 0){
			if(arr[c.second+1] < c.first) curans++;
		}
        else{
			if (arr[c.second-1] > c.first && arr[c.second+1] > c.first) curans--;
            else if (arr[c.second-1] < c.first && arr[c.second+1] < c.first) curans++;
		}
		if (i == cur-1 || v[i].first != v[i+1].first) ans = max(ans, curans);
	}

	cout << ans;  
    return 0;
}

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