Submission #1106026

#	Time	Username	Problem	Language	Result	Execution time	Memory
1106026		HiepVu217	Fuel Station (NOI20_fuelstation)	C++17	100 / 100	249 ms	29512 KiB

FuelStation

#include <bits/stdc++.h>
using namespace std;
const int N = 3e5 + 17;
int n, d;
long long st[4 * N], lz[4 * N], ans;
bool t;
struct dta
{
    int x, a, b, id;
    bool operator < (const dta& other) const {
        return (t ? b > other.b : x < other.x);
    }
} fuel[N];
void down (int id)
{
    st[id * 2] += lz[id];
    lz[id * 2] += lz[id];
    st[id * 2 + 1] += lz[id];
    lz[id * 2 + 1] += lz[id];
    lz[id] = 0;
}
void update (int id, int l, int r, int u, int v, int x)
{
    if (v < l || r < u)
    {
        return;
    }
    if (u <= l && r <= v)
    {
        st[id] += x, lz[id] += x;
        return;
    }
    int mid = l + r >> 1;
    down(id);
    update (id * 2, l, mid, u, v, x);
    update (id * 2 + 1, mid + 1, r, u, v, x);
    st[id] = max (st[id * 2], st[id * 2 + 1]);
}
long long get (int id, int l, int r, int u, int v)
{
    if (v < l || r < u)
    {
        return 0;
    }
    if (u <= l && r <= v)
    {
        return st[id];
    }
    int mid = l + r >> 1;
    down(id);
    return max (get (id * 2, l, mid, u, v), get (id * 2 + 1, mid + 1, r, u, v));
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> d;
    for (int i = 1, x, a, b; i <= n; ++i)
    {
        cin >> x >> a >> b;
        fuel[i] = {x, a, b, 0};
    }
    sort (fuel + 1, fuel + n + 1);
    fuel[n + 1] = {d, 0, 0};
    for (int i = 1; i <= n + 1; ++i)
    {
        fuel[i].id = i;
        update (1, 1, n + 1, i, i, fuel[i].x);
    }
    t = 1;
    sort (fuel + 1, fuel + n + 1);
    ans = st[1];
    for (int i = 1; i <= n + 1; ++i)
    {
        auto [x, a, b, id] = fuel[i];
        update (1, 1, n + 1, id + 1, n + 1, -a);
        if (st[1] <= b)
        {
            ans = min (ans, st[1]);
        }
    }
    cout << ans;
}

Compilation message (stderr)

FuelStation.cpp: In function 'void update(int, int, int, int, int, int)':
FuelStation.cpp:33:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   33 |     int mid = l + r >> 1;
      |               ~~^~~
FuelStation.cpp: In function 'long long int get(int, int, int, int, int)':
FuelStation.cpp:49:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   49 |     int mid = l + r >> 1;
      |               ~~^~~

• 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