Submission #508726

#	Time	Username	Problem	Language	Result	Execution time	Memory
508726		Jeff12345121	Pinball (JOI14_pinball)	C++14	11 / 100	1091 ms	94812 KiB

pinball

#include <bits/stdc++.h>
#define in cin
#define out cout
#define int long long
using namespace std;

//ifstream in("in.in");
//ofstream out("out.out");

struct device {
    int l, r, hole, cost;
};
vector<device> devices;
const int nmax = 20, mmax = 1005, inf = (1LL << 60);
int n, m, dp[nmax][mmax][mmax];
void minSelf(int &a, int b) {
    if (b < a) {
        a = b;
    }
}
int32_t main() {
    in >> n >> m;
    if (m == 1) {
        out << "0\n";
        return 0;
    }
    devices.resize(n + 1);
    for (int i = 1; i <= n; i++) {
        int l, r, hole, cost;
        in >> l >> r >> hole >> cost;
        devices[i] = {l, r, hole, cost};
    }

    /// dp[i][l][r] = using only devices i...n, we have extended the road for the interval
    /// l - r. sum will be in dp[1][1..m]
    for (int i = 0; i <= n + 1; i++) {
        for (int l = 0; l <= m; l++) {
            for (int r = 0; r <= m; r++) {
                dp[i][l][r] = inf;
            }
        }
    }
    for (int i = m; i >= 1; i--) {
        dp[n + 1][i][i] = 0;
    }
    for (int i = n; i >= 1; i--) {
        
        for (int l = 1; l <= m; l++) {
            for (int r = l; r <= m; r++) {
                minSelf(dp[i][l][r], dp[i + 1][l][r]);
                if (dp[i + 1][l][r] == inf) continue;

                if (l <= devices[i].hole && devices[i].hole <= r) {
                    int newL = min(l, devices[i].l);
                    int newR = max(r, devices[i].r);
                    minSelf(dp[i][newL][newR], dp[i + 1][l][r] + devices[i].cost);
                    minSelf(dp[i][l][r], dp[i + 1][l][r]);
                }
            }
        }
    }
    if (dp[1][1][m] == inf) {
        out << "-1\n";
    } else {
        out << dp[1][1][m] << "\n";
    }
}

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