Submission #655055

#	Time	Username	Problem	Language	Result	Execution time	Memory
655055		horiseun	Fuel Station (NOI20_fuelstation)	C++11	13 / 100	178 ms	14648 KiB

FuelStation

#include <iostream>
#include <vector>
#include <tuple>
#include <algorithm>
using namespace std;

int n, d, a, b, x, l, r, m;
vector<tuple<int, int, int>> stops;

bool valid(int f) {
    int cd = 0;
    for (int i = 1; i < stops.size(); i++) {
        tie(x, a, b) = stops[i];
        f -= (x - get<0>(stops[i - 1]));
        if (f < 0) return false;
        if (f <= b) f += a;
    }
    return true;
}

int main() {

    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin >> n >> d;
    for (int i = 0; i < n; i++) {
        cin >> x >> a >> b;
        if (x > d) continue;
        stops.push_back({x, a, b});
    }
    stops.push_back({0, 0, 0});
    sort(stops.begin(), stops.end());

    l = 0, r = 1e9 + 5;
    while (l + 1 != r) {
        m = (l + r) / 2;
        if (valid(m)) r = m;
        else l = m;
    }

    cout << r << "\n";


}

Compilation message (stderr)

FuelStation.cpp: In function 'bool valid(int)':
FuelStation.cpp:12:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::tuple<int, int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for (int i = 1; i < stops.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~
FuelStation.cpp:11:9: warning: unused variable 'cd' [-Wunused-variable]
   11 |     int cd = 0;
      |         ^~

• 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