Submission #1229736

#	Time	Username	Problem	Language	Result	Execution time	Memory
1229736		papaulo	Global Warming (NOI13_gw)	C++20	19 / 40	946 ms	117572 KiB

gw

#include <bits/stdc++.h>
using namespace std;

int gw(int N, int *H) {
    map<int, vector<int>> mp;
    vector<int> ativo(N+2, 0);
    for(int i=0;i<N;i++) {
        auto p = mp.find(H[i]);
        if(p==mp.end()) mp.insert({H[i], vector<int>(1, i+1)});
        else p->second.push_back(i+1);
    }
    int cur=0, ans=0;
    for(auto p = mp.rbegin(); p!=mp.rend(); p++) {
        auto &v = p->second;
        for(auto i : v) {
            if(!ativo[i-1]&&!ativo[i+1]) cur++;
            else if(ativo[i-1]&&ativo[i+1]) cur--;
            ativo[i]=1;
        }
        ans=max(ans, cur);
    }
    return ans;
}

int h[1<<20];

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    for(int i=0;i<n;i++) cin >> h[i];
    cout << gw(n, h) << endl;
}

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