Submission #997084

#	Time	Username	Problem	Language	Result	Execution time	Memory
997084		LOLOLO	Fuel Station (NOI20_fuelstation)	C++17	13 / 100	286 ms	30664 KiB

FuelStation

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
#define           f     first
#define           s     second
#define           pb    push_back
#define           ep    emplace
#define           eb    emplace_back
#define           lb    lower_bound
#define           ub    upper_bound
#define       all(x)    x.begin(), x.end()
#define      rall(x)    x.rbegin(), x.rend()
#define   uniquev(v)    sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define     mem(f,x)    memset(f , x , sizeof(f))
#define        sz(x)    (ll)(x).size()
#define  __lcm(a, b)    (1ll * ((a) / __gcd((a), (b))) * (b))
#define          mxx    *max_element
#define          mnn    *min_element
#define    cntbit(x)    __builtin_popcountll(x)
#define       len(x)    (int)(x.length())
 
const int N = 3e5 + 10;

vector < vector <int>> v;

bool check(int r) {
    int l = 0, pr = 0;
    for (auto x : v) {
        int d = x[0] - pr;
        pr = x[0];
        r -= d;
        l -= d;
        if (r < 0)
            return 0;

        l = max(l, 0);
        r = min(r + x[1], x[2] + x[1]);
    }

    return l <= r;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n, d;
    cin >> n >> d;

    for (int i = 0; i < n; i++) {
        int x, a, b;
        cin >> x >> a >> b;
        v.pb({x, a, b});
    }

    v.pb({d, 0, 0});
    sort(all(v));

    int l = 1, r = d, m, ans;
    while (l <= r) {
        m = (l + r) / 2;
        if (check(m)) {
            ans = m;
            r = m - 1;
        } else {
            l = m + 1;
        }
    }

    cout << ans << '\n';
    return 0;

}
 

Compilation message (stderr)

FuelStation.cpp: In function 'int main()':
FuelStation.cpp:72:20: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   72 |     cout << ans << '\n';
      |                    ^~~~

• Subtask 1: 0 / 7
• Subtask 2: 13 / 13
• Subtask 3: 0 / 17
• Subtask 4: 0 / 12
• Subtask 5: 0 / 19
• Subtask 6: 0 / 11
• Subtask 7: 0 / 21