Submission #1368286

#	Time	Username	Problem	Language	Result	Execution time	Memory
1368286		husseinjuanda	Strange Device (APIO19_strange_device)	C++20	30 / 100	268 ms	48968 KiB

strange_device

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

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, A, B; cin >> n >> A >> B;
    vector<pair<int, int>> seg(n);
    for(auto &i : seg){
        cin >> i.first >> i.second;
    }
    int j = lcm(A, B+1);
    if(j < 0 || j%A != 0 || j%(B+1) != 0){
        j = 2e18;
    }else{
        j/=(B+1);
        j*=B;
    }
    vector<pair<int, int>> se;
    for(auto y : seg){
        if(y.second-y.first+1 >= j){
            cout << j << "\n";
            return 0;
        }else{
            if(y.first%j < y.second%j){
                se.push_back({y.first%j, y.second%j});
            }else{
                se.push_back({y.first%j, j-1});
                se.push_back({0, y.second%j});
            }
        }
    }
    sort(se.begin(), se.end());
    int mx = -1;
    int sum = j;
    for(auto i : se){
        if(i.first > mx+1){
            sum -= (i.first-(mx+1));
        }
        mx = max(mx, i.second);
    }
    if(j > mx+1){
        sum -= (j-(mx+1));
    }
    cout << sum << "\n";
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 20 / 20
• Subtask 8: 0 / 30