Submission #1113170

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113170		votranngocvy	Global Warming (NOI13_gw)	C++14	30 / 40	218 ms	33096 KiB

gw

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

#define pii pair<int,int>
#define fi first
#define se second
const int N = 1e6 + 5;
int par[N],sz[N],h[N],f[N];
pii a[N];

void make_set(int v) {
    par[v] = v;
    sz[v] = 1;
}

int find_set(int v) {
    if (v == par[v]) return v;
    int p = find_set(par[v]);
    par[v] = p;
    return p;
}

void union_sets(int a,int b) {
    a = find_set(a),b = find_set(b);
    if (a == b) return;
    if (sz[a] < sz[b]) swap(a,b);
    sz[a] += sz[b];
    par[b] = a;
}

int gw(int N,int *H) {
    int n = N;
    for (int i = 1; i <= n; i++) {
        a[i].fi = H[i - 1];
        a[i].se = i;
    }
    sort(a + 1,a + n + 1,greater<pii>());
    for (int i = 1; i <= n; i++) make_set(i);
    int ans = 0,cnt = 0,i = 1;
    while (i <= n) {
        int j = i;
        while (j <= n && a[j].fi == a[i].fi) {
            cnt++;
            if (i > 1 && f[a[j].se - 1]) {
                union_sets(a[j].se - 1,a[j].se);
                cnt--;
            }
            if (i < n && f[a[j].se + 1]) {
                union_sets(a[j].se + 1,a[j].se);
                cnt--;
            }
            f[a[j].se] = 1;
            j++;
        }
        i = j;
        ans = max(ans,cnt);
    }
    return ans;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) cin >> h[i];
    cout << gw(n,h) << "\n";
}

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