Submission #876382

#	Time	Username	Problem	Language	Result	Execution time	Memory
876382		overwatch9	Sjekira (COCI20_sjekira)	C++17	0 / 110	82 ms	10900 KiB

sjekira

//subtask2
#include <iostream>
#include <vector>
#include <set>
using namespace std;
using ll = long long;
struct stree {
    #define lc v*2
    #define rc v*2+1
    vector <int> tree;
    stree (int s) {
        tree.resize(s * 4);
    }
    void pushup(int v) {
        tree[v] = max(tree[lc], tree[rc]);
    }
    void update(int v, int tl, int tr, int p, int val) {
        if (tl > p || tr < p)
            return;
        if (tl == tr) {
            tree[v] = val;
            return;
        }
        int tm = (tl + tr) / 2;
        update(lc, tl, tm, p, val);
        update(rc, tm+1, tr, p, val);
        pushup(v);
    }
    int query(int v, int tl, int tr, int l, int r) {
        if (tl > r || tr < l)
            return 0;
        if (tl >= l && tr <= r)
            return tree[v];
        int tm = (tl + tr) / 2;
        int a = query(lc, tl, tm, l, r);
        int b = query(rc, tm+1, tr, l, r);
        return max(a, b);
    }
};
int main() {
    int n;
    cin >> n;
    multiset <pair <int, int>> s;
    multiset <pair <int, int>> rngs;
    rngs.insert({1, n});
    stree tree(n+1);
    for (int i = 1; i <= n; i++) {
        int t;
        cin >> t;
        tree.update(1, 1, n, i, t);
        s.insert({t, i});
    }
    vector <bool> rem(n+1);
    ll ans = 0;
    while (!s.empty()) {
        int mx = s.rbegin()->first;
        int pos = s.rbegin()->second;
        auto tp = rngs.upper_bound({pos, pos});
        tp--;
        int l = tp->first, r = tp->second;
        rngs.erase(tp);
        s.erase(--s.end());
        bool added = false;
        if (pos+1 <= n && !rem[pos+1]) {
            ans += tree.query(1, 1, n, pos+1, r);
            added = true;
        }
        if (pos-1 >= 1 && !rem[pos-1]) {
            ans += tree.query(1, 1, n, l, pos-1);
            added = true;
        }
        rem[pos] = true;
        tree.update(1, 1, n, pos, 0);
        if (added)
            ans += mx;
        if (l == r)
            continue;
        if (pos == l)
            rngs.insert({l+1, r});
        else if (pos == r)
            rngs.insert({l, r-1});
        else {
            rngs.insert({l, pos-1});
            rngs.insert({pos+1, r});
        }
    }
    cout << ans << '\n';
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 30
• Subtask 4: 0 / 60