Submission #1168648

#	Time	Username	Problem	Language	Result	Execution time	Memory
1168648		vibeduck	Fuel Station (NOI20_fuelstation)	C++20	17 / 100	3095 ms	672 KiB

FuelStation

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

#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define int long long
#define all(x) (x).begin(), (x).end()

typedef long double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<bool>> vvb;
typedef vector<vector<ll>> vvll;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef map<int, int> mii;
typedef unordered_map<int, int> umii;

const int mod = 1e9 + 7;
const int inf = INTMAX_MAX;
const bool tc = false;

struct st {
    int x, a, b;
    bool operator<(st other) {
        return x < other.x;
    }
};

int n, d;
const int mxn = 1e4 + 1;
st fuels[mxn];

bool can(int f) {
    int ptr = 0; int cur = f;
    for (int i = 0; i < d; i++) {
        if (cur < 0) return 0;
        while (ptr < n && fuels[ptr].x == i) {
            if (f <= fuels[ptr].b) {
                cur += fuels[ptr].a;
            }
            ptr++;
        }
        cur--;
    }
    return (cur >= 0);
}

inline void solve() {
    cin >> n >> d;
    for (int i = 0; i < n; i++) cin >> fuels[i].x >> fuels[i].a >> fuels[i].b;
    sort(fuels, fuels + n);
    for (int f = 0; f <= d; f++) {
        if (can(f)) {
            cout << f << '\n';
            return;
        }
    }
}

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

signed main() {
    ios::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    //setIO();

    int t = 1;
    if (tc) {
        cin >> t;
    }

    while (t--) {
        solve();
    }
}

Compilation message (stderr)

FuelStation.cpp: In function 'void setIO(std::string)':
FuelStation.cpp:72:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
FuelStation.cpp:73:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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