Submission #1349387

#	Time	Username	Problem	Language	Result	Execution time	Memory
1349387		icebear	Fuel Station (NOI20_fuelstation)	C++20	0 / 100	31 ms	2724 KiB

FuelStation

/* AUTHOR: TUAN ANH - BUI */
// ~~ icebear ~~
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;

template<class X, class Y>
    bool minimize(X &x, const Y &y) {
        if (x > y) return x = y, true;
        return false;
    }

template<class X, class Y>
    bool maximize(X &x, const Y &y) {
        if (x < y) return x = y, true;
        return false;
    }

#define FOR(i,a,b) for(int i=(a); i<=(b); ++i)
#define FORR(i,a,b) for(int i=(a); i>=(b); --i)
#define REP(i, n) for(int i=0; i<(n); ++i)
#define RED(i, n) for(int i=(n)-1; i>=0; --i)
#define MASK(i) (1LL << (i))
#define BIT(S, i) (((S) >> (i)) & 1)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define task "icebear"
/*END OF TEMPLATE. I love my cats <3 */

const int MOD = 1e9 + 7;
const int inf = (int)1e9 + 27092008;
const ll INF  = (ll)1e18 + 27092008;
const int N = 2e5 + 5;
int n, H;
struct Station {
    int x, f, r;
    bool operator < (const Station &other) const {
        return x < other.x;
    }
} S[N];

void init(void) {
    cin >> n >> H;
    FOR(i, 1, n) cin >> S[i].x >> S[i].f >> S[i].r;
    sort(S + 1, S + n + 1);
}

void process(void) {
    auto check = [&](long long V) {
        int last = 0;
        FOR(i, 1, n) {
            V -= S[i].x - last;
            if (V < 0) return false;
            if (V <= S[i].r) V += S[i].f;
            last = S[i].x;
        }
        V -= H - last;
        return V >= 0;
    };

    int low = 0, high = H, res = 0;
    while(low <= high) {
        int mid = (low + high) >> 1;
        if (check(mid)) res = mid, high = mid - 1;
        else low = mid + 1;
    }
    cout << res;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int tc = 1;
//    cin >> tc;
    while(tc--) {
        init();
        process();
    }
    return 0;
}

Compilation message (stderr)

FuelStation.cpp: In function 'int main()':
FuelStation.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
FuelStation.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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