Submission #998473

#	Time	Username	Problem	Language	Result	Execution time	Memory
998473		cpptowin	Fuel Station (NOI20_fuelstation)	C++17	100 / 100	328 ms	61676 KiB

FuelStation

#include <bits/stdc++.h>
#define fo(i, d, c) for (int i = d; i <= c; i++)
#define fod(i, c, d) for (int i = c; i >= d; i--)
#define maxn 1000010
#define N 1010
#define fi first
#define se second
#define pb emplace_back
#define en cout << "\n";
#define int long long
#define inf (int)1e18
#define pii pair<int, int>
#define vii vector<pii>
#define lb(x) x & -x
#define bit(i, j) ((i >> j) & 1)
#define offbit(i, j) (i ^ (1LL << j))
#define onbit(i, j) (i | (1LL << j))
#define vi vector<int>
#define all(x) x.begin(), x.end()
template <typename T1, typename T2>
bool minimize(T1 &a, T2 b)
{
    if (a > b)
    {
        a = b;
        return true;
    }
    return false;
}
template <typename T1, typename T2>
bool maximize(T1 &a, T2 b)
{
    if (a < b)
    {
        a = b;
        return true;
    }
    return false;
}
using namespace std;
const int nsqrt = 450;
const int mod = 1e9 + 7;
struct SegmentTree
{
    vector<int> st, lazy;
    int n;
    /// real n
    SegmentTree(int _n = 0) : n(_n)
    {
        st.resize(4 * n + 10);
        lazy.resize(4 * n + 10);
    }
    void resize(int _n)
    {
        n = _n;
        st.resize(4 * n + 10);
        lazy.resize(4 * n + 10);
    }
    void down(int id, int l, int r)
    {
        st[id << 1] += lazy[id];
        lazy[id << 1] += lazy[id];
        st[id << 1 | 1] += lazy[id];
        lazy[id << 1 | 1] += lazy[id];
        lazy[id] = 0;
    }

    void update(int id, int l, int r, int u, int v, int val)
    {
        if (u > r || l > v)
            return;
        if (u <= l && r <= v)
        {
            st[id] += val;
            lazy[id] += val;
            return;
        }
        down(id, l, r);
        int mid = (l + r) >> 1;
        update(id << 1, l, mid, u, v, val);
        update(id << 1 | 1, mid + 1, r, u, v, val);
        st[id] = max(st[id << 1], st[id << 1 | 1]);
    }

    int get(int id, int l, int r, int u, int v)
    {
        if (l > v || u > r)
            return -inf;
        if (u <= l && r <= v)
            return st[id];
        down(id, l, r);
        int mid = (l + r) >> 1;
        return max(get(id << 1, l, mid, u, v), get(id << 1 | 1, mid + 1, r, u, v));
    }
    int walkright(int id, int l, int r, int x, int val)
    {
        if (st[id] <= val)
            return -1;
        if (r < x)
            return -1;
        if (l == r)
            return l;
        int ans = -1;
        int mid = (l + r) >> 1;
        if (st[id << 1] > val)
            ans = walkright(id << 1, l, mid, x, val);
        if (ans == -1)
            ans = walkright(id << 1 | 1, mid + 1, r, x, val);
        return ans;
    }
    int walkleft(int id, int l, int r, int x, int val)
    {
        if (st[id] <= val)
            return -1;
        if (x < l)
            return -1;
        if (l == r)
            return l;
        int ans = -1;
        int mid = (l + r) >> 1;
        if (st[id << 1 | 1] > val)
            ans = walkleft(id << 1 | 1, mid + 1, r, x, val);
        if (ans == -1)
            ans = walkleft(id << 1, l, mid, x, val);
        return ans;
    }
    int get(int l, int r)
    {
        return get(1, 1, n, l, r);
    }
    void update(int l, int r, int val)
    {
        update(1, 1, n, l, r, val);
    }
};
int n;
vii ke[maxn];
vi nen;
array<int,3> a[maxn];
main()
{
#define name "TASK"
    if (fopen(name ".inp", "r"))
    {
        freopen(name ".inp", "r", stdin);
        freopen(name ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int d;
    cin >> n >> d;
    fo(i, 1, n)
    {
        cin >> a[i][0] >> a[i][1] >> a[i][2];
        nen.pb(a[i][0]);
    }
    nen.pb(d);
    sort(all(nen));
    nen.erase(unique(all(nen)),nen.end());
    int sz = (int)nen.size();
    SegmentTree st(sz);
    fo(i,1,sz) st.update(i,i,nen[i - 1]);
    fo(i,1,n) a[i][0] = lower_bound(all(nen),a[i][0]) - nen.begin() + 1;
    sort(a + 1,a + n + 1,[](array<int,3> a,array<int,3> b)
    {
        return a[2] > b[2] or (a[2] == b[2] and a[0] > b[0]);
    });
    int ans = d;
    fo(i,1,n)
    {
        st.update(a[i][0] + 1,sz,-a[i][1]);
        if(max(st.get(1,sz),0LL) <= a[i][2]) minimize(ans,max(st.get(1,sz),0LL)); 
    }
    cout << ans;
}

Compilation message (stderr)

FuelStation.cpp:140:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  140 | main()
      | ^~~~
FuelStation.cpp: In function 'int main()':
FuelStation.cpp:145:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  145 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
FuelStation.cpp:146:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  146 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 13 / 13
• Subtask 3: 17 / 17
• Subtask 4: 12 / 12
• Subtask 5: 19 / 19
• Subtask 6: 11 / 11
• Subtask 7: 21 / 21