Submission #139532

#	Time	Username	Problem	Language	Result	Execution time	Memory
139532		jovan_b	Strange Device (APIO19_strange_device)	C++17	100 / 100	980 ms	34808 KiB

strange_device

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

typedef long long ll;
typedef long double ld;

vector <pair <ll, ll>> vec;

int main(){
    ios_base::sync_with_stdio(false);
    cout.precision(10);
    cout<<fixed;

    int n;
    cin >> n;
    ll a, b;
    cin >> a >> b;
    a /= __gcd(a, b+1);
    if(a <= 2000000000000000000LL/b) a *= b;
    //cout << a << endl;
    while(n--){
        ll l, r;
        cin >> l >> r;
        if(r-l+1 >= a){
            cout << a << "\n";
            return 0;
        }
        l %= a;
        r %= a;
        if(l > r){
            vec.push_back({0, 1});
            vec.push_back({r+1, -1});
            vec.push_back({l, 1});
            vec.push_back({a, -1});
        }
        else{
            vec.push_back({l, 1});
            vec.push_back({r+1, -1});
        }
    }
    sort(vec.begin(), vec.end());
    n = vec.size();
    ll res = 0;
    ll tren = 0;
    for(int i=0; i<n; i++){
        ll val = vec[i].first;
        //cout << vec[i].first << " " << vec[i].second << endl;
        if(i > 0) val -= vec[i-1].first;
        if(tren) res += val;
        tren += vec[i].second;
        //cout << res << endl;
    }
    cout << res;
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20
• Subtask 8: 30 / 30