Submission #1013433

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013433		TrinhKhanhDung	Fuel Station (NOI20_fuelstation)	C++14	100 / 100	260 ms	32796 KiB

FuelStation

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define sz(x) (int)x.size()
#define ALL(v) v.begin(),v.end()
#define MASK(k) (1LL << (k))
#define BIT(x, i) (((x) >> (i)) & 1)
#define oo (ll)1e18
#define INF (ll)1e9
#define MOD (ll)(998244353)

using namespace std;

template<class T1, class T2>
    bool maximize(T1 &a, T2 b){if(a < b){a = b; return true;} return false;}

template<class T1, class T2>
    bool minimize(T1 &a, T2 b){if(a > b){a = b; return true;} return false;}

template<class T1, class T2>
    void add(T1 &a, T2 b){a += b; if(a >= MOD) a -= MOD;}

template<class T1, class T2>
    void sub(T1 &a, T2 b){a -= b; if(a < 0) a += MOD;}

template<class T>
    void cps(T &v){sort(ALL(v)); v.resize(unique(ALL(v)) - v.begin());}

const int MAX = 3e5 + 10;

int N, D;
tuple<int, int, int> a[MAX];

ll Min[MAX * 4], laz[MAX * 4];

void push(int i){
    Min[i * 2] += laz[i];
    Min[i * 2 + 1] += laz[i];
    laz[i * 2] += laz[i];
    laz[i * 2 + 1] += laz[i];
    laz[i] = 0;
}

void update(int i, int l, int r, int u, int v, ll c){
    if(r < u || v < l) return;
    if(u <= l && r <= v){
        Min[i] += c;
        laz[i] += c;
        return;
    }
    push(i);
    int m = (l + r) >> 1;
    update(i * 2, l, m, u, v, c);
    update(i * 2 + 1, m + 1, r, u, v, c);
    Min[i] = min(Min[i * 2], Min[i * 2 + 1]);
}

void solve(){
    cin >> N >> D;
    for(int i=1; i<=N; i++){
        cin >> get<0>(a[i]) >> get<1>(a[i]) >> get<2>(a[i]);
    }
    sort(a + 1, a + N + 1, [&](tuple<int, int, int> a, tuple<int, int, int> b){
        return get<2>(a) > get<2>(b);
    });
    a[N + 1] = make_tuple(D, 0, 0);

    vector<int> v;
    for(int i=1; i<=N; i++){
        v.push_back(get<0>(a[i]));
    }
    v.push_back(0);
    v.push_back(D);
    cps(v);

    for(int i=0; i<sz(v); i++){
        update(1, 1, sz(v), i + 1, i + 1, -v[i]);
    }

    ll ans = D;
    for(int i=1; i<=N; i++){
        int x = lower_bound(ALL(v), get<0>(a[i])) - v.begin() + 1;
        update(1, 1, sz(v), x + 1, sz(v), get<1>(a[i]));
        if(abs(Min[1]) <= get<2>(a[i])){
            minimize(ans, abs(Min[1]));
        }
    }
    cout << ans << '\n';
}


int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
//    freopen("split.inp", "r", stdin);
//    freopen("split.out", "w", stdout);

    int tt = 1;
//    cin >> tt;

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

    return 0;
}

• 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