Submission #1276193

#	Time	Username	Problem	Language	Result	Execution time	Memory
1276193		wedonttalkanymore	Pinball (JOI14_pinball)	C++20	100 / 100	196 ms	24840 KiB

pinball

#include <bits/stdc++.h>
/*
    Brute to win
*/
using namespace std;
using ll = long long;

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 2e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 19;

int m, n, sz;
struct item {
    int l, r, x, c;
};
item a[N];
vector <int> comp;

struct ST {
    vector <int> st;
    ST(int _n) {
        st.assign(4 * (_n + 1), inf);
    }
    void update(int i, int l, int r, int pos, int val) {
        if (l == r) {
            st[i] = min(st[i], val);
            return;
        }
        int mid = (l + r) / 2;
        if (pos <= mid) update(2 * i, l, mid, pos, val);
        else update(2 * i + 1, mid + 1, r, pos, val);
        st[i] = min(st[2 * i], st[2 * i + 1]);
    }
    int get(int i, int l, int r, int u, int v) {
        if (u > r || v < l) return inf;
        if (u <= l && r <= v) return st[i];
        int mid = (l + r) / 2;
        return min(get(2 * i, l, mid, u, v), get(2 * i + 1, mid + 1, r, u, v));
    }
};

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    cin >> m >> n;
    comp.push_back(1);
    comp.push_back(n);
    for (int i = 1; i <= m; i++) {
        cin >> a[i].l >> a[i].r >> a[i].x >> a[i].c;
        comp.push_back(a[i].l);
        comp.push_back(a[i].r);
        comp.push_back(a[i].x);
    }
    sort(comp.begin(), comp.end());
    comp.erase(unique(comp.begin(), comp.end()), comp.end());
    sz = comp.size(); 
    for (int i = 1; i <= m; i++) {
        a[i].l = lower_bound(comp.begin(), comp.end(), a[i].l) - comp.begin() + 1;
        a[i].r = lower_bound(comp.begin(), comp.end(), a[i].r) - comp.begin() + 1;
        a[i].x = lower_bound(comp.begin(), comp.end(), a[i].x) - comp.begin() + 1;
    }
    ST st(sz), st1(sz);
    st.update(1, 1, sz, 1, 0);
    st1.update(1, 1, sz, sz, 0);
    int ans = inf;
    for (int i = 1; i <= m; i++) {
        auto val = st.get(1, 1, sz, a[i].l, a[i].r);
        if (val < inf) st.update(1, 1, sz, a[i].x, val + a[i].c);
        auto val1 = st1.get(1, 1, sz, a[i].l, a[i].r);
        if (val1 < inf) st1.update(1, 1, sz, a[i].x, val1 + a[i].c);
        if (val < inf && val1 < inf) ans = min(ans, val + val1 + a[i].c);
    }
    cout << (ans >= inf ? -1 : ans);
    return 0;
}

Compilation message (stderr)

pinball.cpp: In function 'int main()':
pinball.cpp:49:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
pinball.cpp:50:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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