Submission #516004

#	Time	Username	Problem	Language	Result	Execution time	Memory
516004		Jeff12345121	Pinball (JOI14_pinball)	C++14	29 / 100	1083 ms	340 KiB

pinball

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

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

int n, m;
const int inf = (1LL << 60);
struct Dev {
    int l, r, hole, cost;
};
vector<Dev> dev;
template <typename F>
int getDp(int len, Dev goal, F f) {
    /// we want to have all the pinballs take it past left
    // dp[i] = minCost to get all balls to this device
    vector<int> dp(len + 1);
    for (int i = 1; i <= len; i++) {
        dp[i] = inf;
    }
    int ans = inf;
    for (int i = 1; i <= len; i++) {
        if (f(dev[i])) {
            dp[i] = dev[i].cost;
        }
        for (int j = 1; j < i; j++) {
            if (dev[i].l <= dev[j].hole && dev[j].hole <= dev[i].r) {
                dp[i] = min(dp[i], dp[j] + dev[i].cost);
            }
        }
        if (goal.l <= dev[i].hole && dev[i].hole <= goal.r) {
            ans = min(ans, dp[i]);
        }
    }
    return ans;
}
int32_t main() {
    in >> m >> n;
    /// m is number of lines, n is number of collumns

    dev.resize(m + 1);
    for (int i = 1; i <= m; i++) {
        int l, r, hole, cost;
        in >> l >> r >> hole >> cost;
        dev[i] = {l, r, hole, cost};
    }

    int ans = inf;
    for (int i = 1; i <= m; i++) {
        /// i is middle
        int leftCost, rightCost;
        if (dev[i].l > 1) {
            leftCost = getDp(i - 1, dev[i], [&](Dev x) {
                return x.l == 1;
            });
        } else {
            leftCost = 0;
        }

        if (dev[i].r < n) {
            rightCost = getDp(i - 1, dev[i], [&](Dev x) {
                return x.r == n;
            });
        } else {
            rightCost = 0;
        }

        ans = min(ans, leftCost + rightCost + dev[i].cost);
        // cout << "\n";
    }

    if (ans == inf) {
        out << "-1\n";
    } else {
        out << ans << "\n";
    }
}

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