Submission #1161120

#	Time	Username	Problem	Language	Result	Execution time	Memory
1161120		nhphuc	Pinball (JOI14_pinball)	C++20	100 / 100	148 ms	22020 KiB

pinball

#include <bits/stdc++.h>
using namespace std;

const int N = 100100;
const int T = 300002;
const long long inf = 1e18;

struct segment_tree {
    int n;
    vector<long long> t;

    segment_tree (){

    }

    segment_tree (int _n){
        n = _n;
        t = vector<long long>(n * 4 + 1007, inf);
    }

private:
    void upd (int id, int l, int r, int k, long long x){
        if (l == r){
            t[id] = min(t[id], x);
            return;
        }
        int m = l + r >> 1;
        if (k <= m){
            upd(id * 2, l, m, k, x);
        } else {
            upd(id * 2 + 1, m + 1, r, k, x);
        }
        t[id] = min(t[id * 2], t[id * 2 + 1]);
        return;
    }

    long long get (int id, int l, int r, int u, int v){
        if (l > v || r < u){
            return inf;
        }
        if (l >= u && r <= v){
            return t[id];
        }
        int m = l + r >> 1;
        return min(get(id * 2, l, m, u, v), get(id * 2 + 1, m + 1, r, u, v));
    }

public:
    void upd (int k, long long x){
        upd(1, 1, n, k, x);
        return;
    }

    long long get (int l, int r){
        return get(1, 1, n, l, r);
    }
} t1, t2;

int n, m, a[N], b[N], c[N], d[N];
long long ans = inf;
vector<int> ns;

int pts (int x){
    return lower_bound(ns.begin(), ns.end(), x) - ns.begin() + 1;
}

int32_t main (){
    ios::sync_with_stdio(false); cin.tie(nullptr);
    if (fopen ("test.inp", "r")){
        freopen ("test.inp", "r", stdin);
        freopen ("test.out", "w", stdout);
    }
    cin >> n >> m;
    ns.push_back(1);
    ns.push_back(m);
    for (int i = 1; i <= n; ++i){
        cin >> a[i] >> b[i] >> c[i] >> d[i];
        ns.push_back(a[i]);
        ns.push_back(b[i]);
        ns.push_back(c[i]);
    }
    sort(ns.begin(), ns.end());
    ns.erase(unique(ns.begin(), ns.end()), ns.end());
    t1 = t2 = segment_tree(ns.size());
    t1.upd(1, 0);
    t2.upd(ns.size(), 0);
    for (int i = 1; i <= n; ++i){
        a[i] = pts(a[i]);
        b[i] = pts(b[i]);
        c[i] = pts(c[i]);
        long long X = t1.get(a[i], b[i]);
        long long Y = t2.get(a[i], b[i]);
        ans = min(ans, X + Y + 1ll * d[i]);
        t1.upd(c[i], X + 1ll * d[i]);
        t2.upd(c[i], Y + 1ll * d[i]);
    }
    cout << (ans == inf ? -1 : ans) << "\n";
}

Compilation message (stderr)

pinball.cpp: In function 'int32_t main()':
pinball.cpp:70:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen ("test.inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
pinball.cpp:71:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen ("test.out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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