Submission #584502

#	Time	Username	Problem	Language	Result	Execution time	Memory
584502		drdilyor	Pinball (JOI14_pinball)	C++17	0 / 100	0 ms	212 KiB

pinball

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/detail/standard_policies.hpp>
#ifdef ONPC
    #include "t_debug.cpp"
#else
    #define debug(...) 42
#endif
#define allit(a) (a).begin(), (a).end()
#define sz(a) ((int) (a).size())
#define cut(s) {cout << s << '\n'; return 0;}

using namespace std;
using ll = long long;
using vi = vector<int>;
namespace pd = __gnu_pbds;
template<typename K> using ordered_set = pd::tree<K, pd::null_type, less<K>, pd::rb_tree_tag, pd::tree_order_statistics_node_update>;
template<typename... T> using hash_table = pd::gp_hash_table<T...>;

const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 rng(RANDOM);
const int INF = 1e9;
const ll INFL = 1e18;
const int N = 1000;
const int M = 10;

struct device {
    int left, right, center, cost;
};
ostream& operator <<(ostream& os, device& a) {
    return os << "{" << a.left << "," << a.right << ", " << a.center << " $" << a.cost << "}";
}

int n, m;
device dev[M];

struct comp {
    bool operator()(int i, int j) { return dev[i].left < dev[j].left; }
};

int solve() {
    cin >> m >> n;
    for (int i = 0; i < n; i++) {
        cin >> dev[i].left >> dev[i].right >> dev[i].center >> dev[i].cost;
        dev[i].left--; dev[i].right--; dev[i].center--;
    }

    ll memoLeft[m], memoRight[m];
    memset(memoLeft, 0, sizeof(memoLeft));
    memset(memoRight, 0, sizeof(memoRight));

    function<ll(int)> dpLeft = [&](int i) {
        ll* memo = memoLeft;
        auto& dp = dpLeft;
        if (i < 0) return INFL;
        if (memo[i]) return memo[i];
        if (dev[i].left == 0) {
            ll res = dev[i].cost;
            for (int prev = 0; prev < i; prev++) {
                if (dev[prev].left == 0) res = min(res, dp(prev));
            }
            return memo[i] = res;
        } else {
            ll res = INFL;
            for (int prev = 0; prev < i; prev++) {
                int l1 = dev[i].left, r1 = dev[i].center;
                int l2 = dev[prev].left, r2 = dev[prev].center;
                if (l2 <= l1 && l1 <= r2) res = min(res, dp(prev));
            }
            return memo[i] = dev[i].cost + res;
        }
    };

    function<ll(int)> dpRight = [&](int i) {
        ll* memo = memoRight;
        auto& dp = dpRight;
        if (i < 0) return INFL;
        if (memo[i]) return memo[i];
        if (dev[i].right == n-1) {
            ll res = dev[i].cost;
            for (int prev = 0; prev < i; prev++) {
                if (dev[prev].right == n-1) res = min(res, dp(prev));
            }
            return memo[i] = res;
        } else {
            ll res = INFL;
            for (int prev = 0; prev < i; prev++) {
                int l1 = dev[i].center, r1 = dev[i].right;
                int l2 = dev[prev].center, r2 = dev[prev].right;
                if (l2 <= r1 && r1 <= r2) res = min(res, dp(prev));
            }
            return memo[i] = dev[i].cost + res;
        }
    };
    ll res = INFL;
    for (int i = 0; i < m; i++) {
        debug(i, dpLeft(i), dpRight(i));
        res = min(res, dpLeft(i) + dpRight(i) - dev[i].cost);
    }
    cout << (res >= INFL ? -1 : res);

    return 0;
}

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    int t = 1;
    //cin >> t;
    while (t-- && cin) {
        if (solve()) break;
        #ifdef ONPC
            cout << "____________________" << endl;
        #endif
    }
    return 0;
}

Compilation message (stderr)

pinball.cpp: In lambda function:
pinball.cpp:66:39: warning: unused variable 'r1' [-Wunused-variable]
   66 |                 int l1 = dev[i].left, r1 = dev[i].center;
      |                                       ^~
pinball.cpp: In lambda function:
pinball.cpp:88:21: warning: unused variable 'l1' [-Wunused-variable]
   88 |                 int l1 = dev[i].center, r1 = dev[i].right;
      |                     ^~
pinball.cpp: In function 'int solve()':
pinball.cpp:7:24: warning: statement has no effect [-Wunused-value]
    7 |     #define debug(...) 42
      |                        ^~
pinball.cpp:97:9: note: in expansion of macro 'debug'
   97 |         debug(i, dpLeft(i), dpRight(i));
      |         ^~~~~

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