Submission #890613

#	Time	Username	Problem	Language	Result	Execution time	Memory
890613		CDuong	Discharging (NOI20_discharging)	C++17	20 / 100	79 ms	10116 KiB

Discharging

/*
#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2,fma,bmi,bmi2,sse4.2,popcnt,lzcnt")
*/

#include <bits/stdc++.h>
#define taskname ""
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define i64 long long
#define pb push_back
#define ff first
#define ss second
#define isz(x) (int)x.size()
using namespace std;

const int mxN = 3e5 + 5;
const int mod = 1e9 + 7;
const i64 oo = 1e18;

int n;
vector<pair<int, int>> a;

bool check(pair<int, int> A, pair<int, int> B) {
    // cout << A.ff << " " << A.ss << " " << B.ff << " " << B.ss << endl;
    return 1ll * A.ff * (A.ss + B.ss) >= 1ll * B.ff * A.ss;
}

void solve() {
    cin >> n;
    for (int i = 1; i <= n; ++i) {
        int val; cin >> val;
        if (a.empty() || a.back().ff < val) a.emplace_back(val, 1);
        else ++a.back().ss;
    }
    vector<pair<int, int>> na;
    na.push_back(a[0]);
    for (int i = 1; i < isz(a); ++i) {
        if (check(na.back(), a[i])) {
            na.back().ff = a[i].ff;
            na.back().ss += a[i].ss;
        }
        else {
            na.push_back(a[i]);
        }
    }
    i64 res = 0, cur = 0;
    for (auto [val, len] : na) {
        cur += val;
        res += 1ll * cur * len;
    }
    cout << res << endl;
}

signed main() {

#ifndef CDuongg
    if(fopen(taskname".inp", "r"))
        assert(freopen(taskname".inp", "r", stdin)), assert(freopen(taskname".out", "w", stdout));
#else
    freopen("bai3.inp", "r", stdin);
    freopen("bai3.out", "w", stdout);
    auto start = chrono::high_resolution_clock::now();
#endif

    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int t = 1; //cin >> t;
    while(t--) solve();

#ifdef CDuongg
   auto end = chrono::high_resolution_clock::now();
   cout << "\n"; for(int i = 1; i <= 100; ++i) cout << '=';
   cout << "\nExecution time: " << chrono::duration_cast<chrono::milliseconds> (end - start).count() << "[ms]" << endl;
   cout << "Check array size pls sir" << endl;
#endif

}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 25
• Subtask 4: 11 / 11
• Subtask 5: 0 / 14
• Subtask 6: 0 / 28