Submission #1175284

#	Time	Username	Problem	Language	Result	Execution time	Memory
1175284		nguyenkhangninh99	Fuel Station (NOI20_fuelstation)	C++17	37 / 100	196 ms	15624 KiB

FuelStation

#include<bits/stdc++.h>

using namespace std;

#define int long long

const int maxn = 3e5 + 5;

struct ttt{
    int x, a, b;
} tram[maxn];

bool cmp(ttt c1, ttt c2){
    return c1.x < c2.x;
}

vector<pair<int, int>> tram2[10005];

int n, d; 

bool check(int mid){
    int fuel = mid;
    for(int i = 1; i <= n; i++){
        if(fuel >= tram[i].x) fuel += tram[i].a;
        else return false;
    }
    return true;
}

bool check2(int f){
    int fuel = f;
    for(int i = 1; i <= d; i++){
        if(fuel < i) return false;
        int l = 0, r = tram2[i].size() - 1, ans = -1;
        while(l <= r){
            int mid = (l + r) / 2;
            if(tram2[i][mid].first >= f){
                ans = mid;
                l = mid + 1;
            }
            else r = mid - 1;
        }
        if(ans != -1) fuel += tram2[i][ans].second;
    }
    return true;
}
void solve(){
   cin >> n >> d;

    int mn = 1e9;
    for(int i = 1; i <= n; i++){
        cin >> tram[i].x >> tram[i].a >> tram[i].b;
        mn = min(mn, tram[i].b);
    }
    sort(tram + 1, tram + n + 1, cmp);

    if(n == 1){
        if(max(tram[1].x, d - tram[1].a) <= tram[1].b) cout << max(tram[1].x, d - tram[1].a);
        else cout << d;
    }


    else if(mn == 1e9){
        int l = 1, r = d, ans = 1;
        while(l <= r){
            int mid = (l + r) / 2;

            if(check(mid)){
                ans = mid;
                r = mid - 1;
            }
            else l = mid + 1;
        }

        cout << ans;
    }

    else{
        for(int i = 1; i <= n; i++) tram2[tram[i].x].push_back({tram[i].b, tram[i].a});
        for(int i = 1; i <= d; i++){
            sort(tram2[i].begin(), tram2[i].end(), greater<>());
            for(int j = 1; j < tram2[i].size(); j--) tram2[i][j].second += tram2[i][j - 1].second;
        }

        for(int f = 1; f <= d; f++){
            if(check2(f)){
                cout << f;
                return;
            }
        }
    }
}


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

    solve();
}

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