Submission #895961

#	Time	Username	Problem	Language	Result	Execution time	Memory
895961		omsincoconut	Potatoes and fertilizers (LMIO19_bulves)	C++17	0 / 100	1 ms	2524 KiB

bulves

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long int lli;
typedef long double ld;
typedef pair<ld, ld> pld;
typedef pair<lli, lli> pll;
#define mp(x, y) make_pair(x, y)
 
const lli MAXN = 5e5+5;
 
lli N;
lli a[MAXN], b[MAXN];
 
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
 
    cin >> N;
    for (lli i = 0; i < N; i++) cin >> a[i] >> b[i];
    priority_queue<pll> fpos, bpos;
    fpos.emplace(-1e9, 0);
    bpos.emplace(-1e9, 0);
    for (lli i = 0; i < N; i++) {
        if (a[i] >= b[i]) {
            a[i] -= b[i];
            b[i] = 0;
            if (a[i] > 0) fpos.emplace(-i, a[i]);
        } else {
            b[i] -= a[i];
            a[i] = 0;
        }
    }
 
    lli ans = 0;
    for (lli i = 0; i < N; i++) {
        while (-fpos.top().first <= i) {
            bpos.emplace(-fpos.top().first, fpos.top().second);
            fpos.pop();
        }
        while (b[i] > 0) {
            lli fp = -fpos.top().first, bp = bpos.top().first;
            lli fd = fp - i, bd = i - bp;
            if (bd <= fd) {
                lli vl = bpos.top().second;
                if (vl <= b[i]) {
                    ans += bd*vl;
                    b[i] -= vl;
                    bpos.pop();
                } else {
                    ans += bd*b[i];
                    vl -= b[i];
                    b[i] = 0;
                    pll tmp = mp(bp, vl);
                    bpos.pop();
                    bpos.push(tmp);
                }
            } else {
                lli vl = fpos.top().second;
                if (vl <= b[i]) {
                    ans += fd*vl;
                    b[i] -= vl;
                    fpos.pop();
                } else {
                    ans += fd*b[i];
                    vl -= b[i];
                    b[i] = 0;
                    pll tmp = mp(-fp, vl);
                    fpos.pop();
                    fpos.push(tmp);
                }
            }
        }
    }
 
    cout << ans;
 
    return 0;
}

• Subtask 1: 0 / 24
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 10
• Subtask 5: 0 / 36