Submission #1113796

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113796		Aviansh	Fuel Station (NOI20_fuelstation)	C++17	67 / 100	3054 ms	16908 KiB

FuelStation

#include <bits/stdc++.h>

using namespace std;

long long n,d;
bool check(array<long long,3>fuels[], long long f){
    long long F=f;
    //cout << "attempting: " << f << "\n";
    for(long long i = 1;i<n+2;i++){
      //  cout << "at station " << i << "\n";
        //cout << fuels[i][0] << " " << fuels[i][1] << " " << fuels[i][2] << "\n";
        f-=fuels[i][0]-fuels[i-1][0];
      //  cout << "current fuel: " << f << "\n";
        if(f<0){
            return 0;
        }
        if(F>fuels[i][2]){
            continue;
        }
        f+=fuels[i][1];
        //cout << "fueled from station " << i << "\n";
    }
    return 1;
}

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin >> n>>d;
    array<long long,3> fuels[n+2];
    fuels[0][0]=0;
    fuels[0][1]=0;
    fuels[0][2]=d+5;
    fuels[n+1][0]=d;
    fuels[n+1][1]=0;
    fuels[n+1][2]=d+5;
    vector<long long>bs;
    for(long long i = 1;i<=n;i++){
        long long a,b,x;
        cin >> x >> a >> b;
        fuels[i][0]=x;
        fuels[i][1]=a;
        fuels[i][2]=b;
        bs.push_back(b);
    }
    bs.push_back(d);
    sort(bs.begin(),bs.end());
    sort(fuels,fuels+n+2);

    if(d<=1e4){
        for(int i = 0;i<d;i++){
            if(check(fuels,i)){
                cout << i;
                return 0;
            }
        }
    }
    long long hi = d;
    for(long long i : bs){
        if(check(fuels,i)){
            hi=i;
            break;
        }
    }
    long long lo = 0;
    while(lo<hi){
        long long mid = (lo+hi)/2;
        if(check(fuels,mid)){
            hi=mid;
        }
        else{
            lo=mid+1;
        }
    }
    cout << lo;
    return 0;
}

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