Submission #955744

#	Time	Username	Problem	Language	Result	Execution time	Memory
955744		vjudge1	Pinball (JOI14_pinball)	C++17	51 / 100	1014 ms	8448 KiB

pinball

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main()
{
    ll m, n, i, j, k, a, b, w = 0, ma, r = (1LL << 50);
    cin >> m >> n;
    vector<vector<ll> > v, vv(m);
    vector<ll> lp, rp;
    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]};
    lp.resize(w + 1);
    rp.resize(w + 1);
    for (i = 0; i <= w; i++)
        lp[i] = rp[i] = r;
    lp[0] = rp[w] = 0;
    ma = r;
    ll ml, mr;
    for (i = 0; i < m; i++)
    {
        for (j = vv[i][0]; j < vv[i][1]; j++)
            lp[vv[i][1]] = min(lp[vv[i][1]], lp[j] + d[i]);
        for (j = vv[i][2]; j > vv[i][1]; j--)
            rp[vv[i][1]] = min(rp[vv[i][1]], rp[j] + d[i]);
        ll ml, mr;
        ml = lp[vv[i][0]];
        for (j = w; j > vv[i][0]; j--)
            ml = min(ml, lp[j]);
        mr = rp[vv[i][2]];
        for (j = 0; j < vv[i][2]; j++)
            mr = min(mr, rp[j]);
        ma = min(ma, ml + mr + d[i]);
    }
    for (j = 1; j <= w; j++)
        rp[j] = min(rp[j], rp[j - 1]);
    for (j = w - 1; j >= 0; j--)
        lp[j] = min(lp[j], lp[j + 1]);
    for (j = 0; j <= w; j++)
        ma = min(ma, lp[j] + rp[j]);
    if (ma < r)
        cout << ma;
    else
        cout << -1;
    return 0;
}

Compilation message (stderr)

pinball.cpp: In function 'int main()':
pinball.cpp:6:20: warning: unused variable 'k' [-Wunused-variable]
    6 |     ll m, n, i, j, k, a, b, w = 0, ma, r = (1LL << 50);
      |                    ^
pinball.cpp:6:23: warning: unused variable 'a' [-Wunused-variable]
    6 |     ll m, n, i, j, k, a, b, w = 0, ma, r = (1LL << 50);
      |                       ^
pinball.cpp:6:26: warning: unused variable 'b' [-Wunused-variable]
    6 |     ll m, n, i, j, k, a, b, w = 0, ma, r = (1LL << 50);
      |                          ^
pinball.cpp:48:8: warning: unused variable 'ml' [-Wunused-variable]
   48 |     ll ml, mr;
      |        ^~
pinball.cpp:48:12: warning: unused variable 'mr' [-Wunused-variable]
   48 |     ll ml, mr;
      |            ^~

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