Submission #782615

#	Time	Username	Problem	Language	Result	Execution time	Memory
782615		andecaandeci	Strange Device (APIO19_strange_device)	C++17	65 / 100	367 ms	16856 KiB

strange_device

# include <bits/stdc++.h>
# define int long long
# define vi vector<int>
# define pb push_back
# define pii pair<int, int>
# define fi first
# define se second
# define endl '\n'
# define jess ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

int n, a, b;

void solve() {
    cin >> n >> a >> b;
    __int128_t t=(__int128_t)a*b;
    __int128_t cycle=t / __gcd(a, b+1);
    vector<pii> v;
    bool ok=1;
    int ya;
    for(int i=1; i<=n; i++) {
        int l, r;
        cin >> l >> r;
        if((r-l+1) >= cycle) {
            ya=r-l+1;
            ok=0;
        }
        l%=cycle;
        r%=cycle;
        if(r < l) {
            v.pb({l, cycle-1});
            v.pb({0, r});
        } else {
            v.pb({l, r});
        }
    }
    sort(v.begin(), v.end());
    bool st=1;
    int l=0, r=1, ans=0;
    // for(pii i : v) cout << "l r " << i.fi << " " << i.se << endl;
    for(auto i : v) {
        if(st) {
            l=i.fi, r=i.se;
            st=0;
            continue;
        }
        if(i.fi>=l && i.fi<=r) {
            r=max(r, i.se);
        } else {
            ans+=(r-l+1);
            l=i.fi, r=i.se;
        }
    }
    if(!ok) {
        cout << ya << endl;
        return;
    }
    ans+=(r-l+1);
    cout << ans << endl;
}
 
signed main() {
    jess;
    solve();
}

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