Submission #581448

#	Time	Username	Problem	Language	Result	Execution time	Memory
581448		Vanilla	Pinball (JOI14_pinball)	C++17	0 / 100	10 ms	19028 KiB

pinball

#include <bits/stdc++.h>
using namespace std;
typedef long long int64;
const int maxn = 1e5 + 2;
int64 a[maxn], b[maxn], c[maxn], cost[maxn];
vector <int64> coord;
int64 l[12 * maxn];// l[i] -> min cost sa ajungi in device i incepand de pe coloana 1
int64 r[12 * maxn];// r[i] -> min cost sa ajungi in device i incepand de pe coloana m

int64 query (int x, int l, int r, int il, int ir, int64 sgt[]) {
    if (il <= l && r <= ir) return sgt[x];
    if (l > ir || r < il) return 1e15;
    int mid = (l + r) / 2;
    return min(query(2 * x, l, mid, il, ir, sgt), query(2 * x + 1, mid + 1, r, il, ir, sgt));
}

int64 update (int x, int l, int r, int pos, int64 val, int64 sgt[]) {
    if (l == pos && r == pos) return sgt[x] = min(sgt[x], val);
    if (l > pos || r < pos) return 1e15;
    int mid = (l + r) / 2;
    return sgt[x] = min(update(2 * x, l, mid, pos, val, sgt), update(2 * x + 1, mid + 1, r, pos, val, sgt));
}



int main() {
    int64 n,m;
    cin >> n >> m;
    bool f1 = 0, f2 = 0;
    for (int i = 0; i < 12 * maxn; i++){
        l[i] = r[i] = 1e15;
    }
    for (int i = 0; i < n; i++){
        cin >> a[i] >> b[i] >> c[i] >> cost[i];
        if (a[i] == 1) f1 = 1;
        if (b[i] == m) f2 = 1;
        coord.push_back(a[i]);
        coord.push_back(b[i]);
        coord.push_back(c[i]);
    }
    if (!f1 || !f2){
        cout << -1;
        return 0;
    }
    sort(coord.begin(), coord.end());
    m = 0;
    for (int i = 0; i < n; i++){
        a[i] = lower_bound(coord.begin(), coord.end(), a[i]) - coord.begin();
        b[i] = lower_bound(coord.begin(), coord.end(), b[i]) - coord.begin();
        c[i] = lower_bound(coord.begin(), coord.end(), c[i]) - coord.begin();
        m = max(m, b[i]);
    }
    int64 rs = 1e15;
    for (int i = 0; i < n; i++){
        if (a[i] == 0) update(1, 0, 3 * n, c[i], cost[i], l);
        else update(1, 0, 3 * n, c[i], query(1, 0, 3 * n, a[i], b[i], l) + cost[i], l);
        if (b[i] == m) update(1, 0, 3 * n, c[i], cost[i], r);
        else update(1, 0, 3 * n, c[i], query(1, 0, 3 * n, a[i], b[i], r) + cost[i], r);
        rs = min(rs, query(1, 0, 3 * n, c[i], c[i], l) + query(1, 0, 3 * n, c[i], c[i], r) - cost[i]);
    }
    cout << (rs == 1e15 ? -1: rs);
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 18
• Subtask 3: 0 / 22
• Subtask 4: 0 / 49