Submission #612367

#	Time	Username	Problem	Language	Result	Execution time	Memory
612367		Theo830	Strange Device (APIO19_strange_device)	C++17	15 / 100	740 ms	53336 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e18+7;
const ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<ii,ll>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
int main(void){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n,A,B;
    cin>>n>>A>>B;
    ll c = B;
    ll g = __gcd(B+1,A);
    A /= g;
    ll maxi = 1e18 + 105;
    if(maxi / c < A){
        c = maxi;
    }
    else{
        c *= A;
    }
    vector<ii>ex;
    f(i,0,n){
        ll l,r;
        cin>>l>>r;
        if(r - l + 1 >= c){
            ex.pb(ii(0,c - 1));
        }
        else{
            l %= c;
            r %= c;
            if(l <= r){
                ex.pb(ii(l,r));
            }
            else{
                ex.pb(ii(l,c-1));
                ex.pb(ii(0,r));
            }
        }
    }
    sort(all(ex));
    ll l = ex[0].F,r = ex[0].S;
    ll ans = 0;
    for(auto x:ex){
        if(x.F <= r){
            r = x.S;
        }
        else{
            ans += r - l + 1;
            l = x.F,r = x.S;
        }
    }
    ans += r - l + 1;
    cout<<ans<<"\n";
}

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