Submission #955774

#	Time	Username	Problem	Language	Result	Execution time	Memory
955774		vjudge1	Pinball (JOI14_pinball)	C++17	100 / 100	348 ms	64244 KiB

pinball

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
vector<ll> lp, rp, wl, wr;
ll p, re = (1LL << 50);
void update(bool w, ll i, ll x)
{
    while (i > 0)
    {
        if (w)
            rp[i] = min(rp[i], x);
        else
            lp[i] = min(lp[i], x);
        i /= 2;
    }
    return;
}
ll qmin(bool w, ll l, ll r, ll i)
{
    if (wl[i] >= r || wr[i] <= l)
        return re;
    if (wl[i] >= l && wr[i] <= r)
    {
        if (w)
            return rp[i];
        else
            return lp[i];
    }
    return min(qmin(w, l, r, 2 * i), qmin(w, l, r, 2 * i + 1));
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    ll m, n, i, j, k, a, b, w = 0, ma;
    cin >> m >> n;
    vector<vector<ll> > v, vv(m);
    vector<ll> d(m), s(3 * m);
    for (i = 0; i < m; i++)
    {
        cin >> j;
        v.push_back({j - 1, i, -1});
        cin >> j;
        v.push_back({j - 1, i, 1});
        cin >> j;
        v.push_back({j - 1, i, 0});
        cin >> d[i];
    }
    sort(v.begin(), v.end());
    if (v[0][0] || v[3 * m - 1][0] != n - 1)
    {
        cout << -1;
        return 0;
    }
    for (i = 0; i < 3 * m; i++)
    {
        if (!i)
            s[i] = 0;
        else if (v[i][0] > v[i - 1][0])
            s[i] = s[i - 1] + 1;
        else
            s[i] = s[i - 1];
        w = max(w, s[i]);
    }
    for (i = 0; i < 3 * m; i++)
        v[i] = {v[i][1], s[i], v[i][2]};
    sort(v.begin(), v.end());
    for (i = 0; i < m; i++)
        vv[i] = {v[3 * i][1], v[3 * i + 1][1], v[3 * i + 2][1]};
    p = w + 1;
    while (p != (p & -p))
        p++;
    lp.resize(2 * p);
    rp.resize(2 * p);
    wl.resize(2 * p);
    wr.resize(2 * p);
    for (i = p; i < 2 * p; i++)
    {
        lp[i] = rp[i] = re;
        wl[i] = i;
        wr[i] = i + 1;
    }
    lp[p] = rp[p + w] = 0;
    for (i = p - 1; i > 0; i--)
    {
        lp[i] = min(lp[2 * i], lp[2 * i + 1]);
        rp[i] = min(rp[2 * i], rp[2 * i + 1]);
        wl[i] = wl[2 * i];
        wr[i] = wr[2 * i + 1];
    }
    ma = re;
    ll ml, mr;
    for (i = 0; i < m; i++)
    {
        update(0, vv[i][1] + p, qmin(0, vv[i][0] + p, vv[i][1] + p, 1) + d[i]);
        update(1, vv[i][1] + p, qmin(1, vv[i][1] + 1 + p, vv[i][2] + 1 + p, 1) + d[i]);
        ma = min(ma, qmin(0, vv[i][0] + p, w + 1 + p, 1) + qmin(1, p, vv[i][2] + 1 + p, 1) + d[i]);
    }
    for (j = 1; j <= w; j++)
        rp[j] = min(rp[j + p], rp[j + p - 1]);
    for (j = w - 1; j >= 0; j--)
        lp[j + p] = min(lp[j + p], lp[j + p + 1]);
    for (j = 0; j <= w; j++)
        ma = min(ma, lp[j + p] + rp[j + p]);
    if (ma < re)
        cout << ma;
    else
        cout << -1;
    return 0;
}

Compilation message (stderr)

pinball.cpp: In function 'int main()':
pinball.cpp:35:20: warning: unused variable 'k' [-Wunused-variable]
   35 |     ll m, n, i, j, k, a, b, w = 0, ma;
      |                    ^
pinball.cpp:35:23: warning: unused variable 'a' [-Wunused-variable]
   35 |     ll m, n, i, j, k, a, b, w = 0, ma;
      |                       ^
pinball.cpp:35:26: warning: unused variable 'b' [-Wunused-variable]
   35 |     ll m, n, i, j, k, a, b, w = 0, ma;
      |                          ^
pinball.cpp:92:8: warning: unused variable 'ml' [-Wunused-variable]
   92 |     ll ml, mr;
      |        ^~
pinball.cpp:92:12: warning: unused variable 'mr' [-Wunused-variable]
   92 |     ll ml, mr;
      |            ^~

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