제출 #1310458

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1310458		nhphuc	Fuel Station (NOI20_fuelstation)	C++20	100 / 100	308 ms	27100 KiB

FuelStation

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

#define int long long

const int N = 300300;

int n, d, t[N * 4], lz[N * 4];
vector<int> ns;

struct station {

    int x, a, b;

    station (int _x = 0, int _a = 0, int _b = 0):
        x(_x), a(_a), b(_b){};

    const bool operator< (const station &oth){
        return b < oth.b;
    }

} a[N];

void push (int id, int l, int r){
    if (l == r || lz[id] == 0){
        return;
    }
    int &x = lz[id];
    t[id * 2] += x;
    t[id * 2 + 1] += x;
    lz[id * 2] += x;
    lz[id * 2 + 1] += x;
    x = 0;
    return;
}

void upd (int id, int l, int r, int u, int v, int x){
    push(id, l, r);
    if (l > v || r < u){
        return;
    }
    if (l >= u && r <= v){
        t[id] += x;
        lz[id] += x;
        return;
    }
    int m = (l + r) >> 1;
    upd(id * 2, l, m, u, v, x);
    upd(id * 2 + 1, m + 1, r, u, v, x);
    t[id] = max(t[id * 2], t[id * 2 + 1]);
    return;
}

bool vis[N];

int32_t main (){
    ios::sync_with_stdio(false); cin.tie(nullptr);
    const string task = "test";
    if (fopen ((task + ".inp").c_str(), "r")){
        freopen ((task + ".inp").c_str(), "r", stdin);
        freopen ((task + ".out").c_str(), "w", stdout);
    }
    cin >> n >> d;
    ns.push_back(0);
    ns.push_back(d);
    for (int i = 1; i <= n; ++i){
        cin >> a[i].x >> a[i].a >> a[i].b;
        ns.push_back(a[i].x);
    }
    sort(ns.begin(), ns.end());
    ns.erase(unique(ns.begin(), ns.end()), ns.end());
    sort(a + 1, a + n + 1);
    for (int i = 1; i <= n; ++i){
        a[i].x = lower_bound(ns.begin(), ns.end(), a[i].x) - ns.begin();
    }
    upd(1, 1, ns.size() - 1, ns.size() - 1, ns.size() - 1, d);
    int ans = d;
    for (int i = n; i >= 1; --i){
        if (a[i].x != ns.size() - 1){
            upd(1, 1, ns.size() - 1, a[i].x + 1, ns.size() - 1, -a[i].a);
        }
        if (!vis[a[i].x]){
            upd(1, 1, ns.size() - 1, a[i].x, a[i].x, ns[a[i].x]);
        }
        vis[a[i].x] = true;
        if (t[1] <= a[i].b){
            ans = min(ans, t[1]);
        }
    } 
    cout << ans << "\n";
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

FuelStation.cpp: In function 'int32_t main()':
FuelStation.cpp:60:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         freopen ((task + ".inp").c_str(), "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
FuelStation.cpp:61:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen ((task + ".out").c_str(), "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