Submission #783498

#	Time	Username	Problem	Language	Result	Execution time	Memory
783498		makanhulia	Strange Device (APIO19_strange_device)	C++17	100 / 100	368 ms	19088 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;
    if(cycle <= 1e18) {
        int tm=a*b;
        for(int i=1; i<=n; i++) {
            int l, r;
            cin >> l >> r;
            if((r-l+1) >= tm) {
                cout << min(r-l+1, tm) << endl;
                return;
            }
            l%=cycle;
            r%=cycle;
            if(r < l) {
                v.pb({l, cycle-1});
                v.pb({0, r});
            } else {
                v.pb({l, r});
            }
        }
    } else {
        for(int i=1; i<=n; i++) {
            int l, r;
            cin >> l >> r;
            if((r-l+1) >= cycle) {
                cout << r-l+1 << endl;
                return;
            }
            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;
        }
    }
    ans+=(r-l+1);
    cout << ans << endl;
}
 
signed main() {
    jess;
    solve();
}

Compilation message (stderr)

strange_device.cpp: In function 'void solve()':
strange_device.cpp:20:10: warning: unused variable 'ok' [-Wunused-variable]
   20 |     bool ok=1;
      |          ^~
strange_device.cpp:21:9: warning: unused variable 'ya' [-Wunused-variable]
   21 |     int ya;
      |         ^~

• 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