Submission #858153

#	Time	Username	Problem	Language	Result	Execution time	Memory
858153		thangdz2k7	Fuel Station (NOI20_fuelstation)	C++17	100 / 100	241 ms	39860 KiB

FuelStation

#include <bits/stdc++.h>
#define int long long
#define ii pair <int, int>
#define F first
#define S second

using namespace std;

const int mod = 1e9 + 7;
const int N = 3e5 + 5;

int n, d, a[N], b[N], x[N];
int sr[N], t[N];

int Max[4 * N], lazy[4 * N];

void build(int s, int l, int r){
    if (l == r){
        Max[s] = sr[l];
        return;
    }
    int mid = l + r >> 1;
    build(2 * s, l, mid);
    build(2 * s + 1, mid + 1, r);
    Max[s] = max(Max[2 * s], Max[2 * s + 1]);
}

void update(int s, int l, int r, int u, int val){
    if (u <= l){
        lazy[s] += val;
        Max[s] += val;
        return;
    }
    int mid = l + r >> 1;
    if (mid >= u) update(2 * s, l, mid, u, val);
    update(2 * s + 1, mid + 1, r, u, val);
    Max[s] = max(Max[2 * s], Max[2 * s + 1]) + lazy[s];
}

void solve(){
    cin >> n >> d;
    for (int i = 1; i <= n; ++ i) {
        cin >> x[i] >> a[i] >> b[i];
        sr[i] = x[i];
        t[i] = i;
    }
    ++ n;
    x[n] = d;
    sr[n] = d;
    a[n] = 0;
    t[n] = n;
    sort(sr + 1, sr + n + 1);
    for (int i = 1; i <= n; ++ i) x[i] = lower_bound(sr + 1, sr + n + 1, x[i]) - sr;
    sort(t + 1, t + n + 1, [&](int u, int v){
         return b[u] > b[v];
    });

    int ans = d;
    build(1, 1, n);
    for (int z = 1; z <= n; ++ z){
        //cout << Max[1] << endl;
        int i = t[z];
        if (x[i] + 1 <= n) update(1, 1, n, x[i] + 1, -a[i]);
        if (Max[1] <= b[i]) ans = min(ans, Max[1]);
    }

    cout << max(0ll, ans);
}

signed main(){
    //freopen("code.inp", "r", stdin);
    //freopen("code.out", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    while (t --) solve();

    return 0;
}

Compilation message (stderr)

FuelStation.cpp: In function 'void build(long long int, long long int, long long int)':
FuelStation.cpp:22:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   22 |     int mid = l + r >> 1;
      |               ~~^~~
FuelStation.cpp: In function 'void update(long long int, long long int, long long int, long long int, long long int)':
FuelStation.cpp:34:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   34 |     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