Submission #934545

#	Time	Username	Problem	Language	Result	Execution time	Memory
934545		ByeWorld	Strange Device (APIO19_strange_device)	C++14	100 / 100	1172 ms	53412 KiB

strange_device

#include <bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define int long long
#define ll long long
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii,int> ipii;
const ll INF = 1e18;

int n, a, b;
int F, K, P;
vector <pii> vec;
int ans;

signed main() {
	cin >> n >> a >> b;
	b++;
    F = __gcd(a, b);
    a /= F;
    if (INF/b < a) K = INF;
    else K = a * b;
    P = K - a;
    
    for(int i=1; i<=n; i++){
        int l, r; cin >> l >> r;
        if(r-l+1 >= P){
            cout << P << '\n'; exit(0);
        }
        l %= P; r %= P;
        if(l<=r){
            vec.pb({l, r});
        } else {
            vec.pb({l, P-1}); 
            vec.pb({0, r});
        }
    }
    sort(vec.begin(), vec.end());
    int las = -1, ans = 0;
    for(auto in : vec){
        if(in.se <= las) continue;
        ans += in.se - max(in.fi-1, las);
        las = in.se;
    }
    cout << ans << '\n';
}

• 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