Submission #1291375

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291375		M_SH_O	Real Mountains (CCO23_day1problem2)	C++20	0 / 25	507 ms	156988 KiB

Main

/*#pragma GCC optimize("O3")
#pragma GCC optimization("Ofast,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")*/
#include <bits/stdc++.h>
/*#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>*/

#define ll long long
#define ll1 long long
#define ull unsigned long long
#define dou long double
#define str string
#define vll vector<ll>
#define vi vector<int>
#define pll pair<ll, ll>
#define vpll vector<pair<ll, ll>>
#define vbool vector<bool>
#define vstr vector<str>
#define vvll vector<vll>
#define pb push_back
#define pf push_front
#define endl "\n"
#define fr first
#define se second
// #define sortcmp(a) sort(a.begin(), a.end(), cmp)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define speed ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ordered_set tree<ll, null_type, less_equal<ll>, rb_tree_tag, tree_order_statistics_node_update>

using namespace std;
//using namespace __gnu_pbds;

const ll INF = 1e18+7;
const int lg = 20;
//const ll MOD = 1e9+7;
//const ll MOD2 = 998244353;
const ll MOD3 = 1e6+3;

mt19937 rng(1488);
ll randll(ll l, ll r) {
    return uniform_int_distribution<ll>(l, r)(rng);
}

vll tree;

void bt(ll v, ll tl, ll tr, vll& a) {
    if (tl == tr) {
        tree[v] = a[tl];
        return;
    }

    ll tm = (tl+tr)/2;
    bt(v*2, tl, tm, a);
    bt(v*2+1, tm+1, tr, a);

    tree[v] = min(tree[v*2], tree[v*2+1]);
}

ll get(ll l, ll r, ll v, ll tl, ll tr) {
    if (l <= tl && tr <= r) return tree[v];
    if (tl > r || tr < l) return INF;

    ll tm = (tl+tr)/2;
    //push(v, tl, tr);
    ll p = get(l, r, v*2, tl, tm), p1 = get(l, r, v*2+1, tm+1, tr);
    return min(p,p1);
}


void update(ll idx, ll val, ll v, ll tl, ll tr) {
    if (tl == tr) {
        tree[v] = val;
        return;
    }

    ll tm = (tl+tr)/2;
    //push(v, tl, tr);

    if (idx <= tm)update(idx, val, v*2, tl, tm);
    else update(idx, val, v*2+1, tm+1, tr);

    tree[v] = min(tree[v*2], tree[v*2+1]);
}

int main() {
    speed;
    ll n;
    cin >> n;
    vll a(n);
    map<ll, vll> m, m1;
    for (int i = 0; i < n; i ++) {
        cin >> a[i];
        m[a[i]].pb(i);
    }
    tree.resize(n*4+7);
    bt(1, 0, n-1, a);

    vll b = a;
    ll mx = 0;
    for (int i = 0; i < n; i ++) {
        mx = max(mx, a[i]);
        b[i] = mx;
    }
    mx = 0;
    for (int i = n-1; i >= 0; i --) {
        mx = max(mx, a[i]);
        b[i] = min(b[i], mx);
        m1[b[i]].pb(i);
    }
    /*for (int i = 0; i < n; i ++) {
        cout << b[i] << " ";
    }
    cout << endl;*/

    set<ll> s;
    ll k = 0, res = 0;

    for (ll i = 1; i < 1e6; i ++) {
        if (!s.empty()) {
            ll l = *s.begin(), r = *--s.end();
            ll c = 0;
            c += get(0, l-1, 1, 0, n-1)+get(r+1, n-1, 1, 0, n-1);
            if (l != r) c += get(l+1, r-1, 1, 0, n-1);
            c += (ll)s.size()*(i-1);
            res += c;
            res %= MOD3;
            //cout << i << ' ' << c << endl;
        }
        for (int j : m[i]) {
            update(j, INF, 1, 0, n-1);
            s.insert(j);
        }
        for (int j : m1[i]) {
            s.erase(j);
        }
    }

    cout << res << endl;
}

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