Submission #897821

#	Time	Username	Problem	Language	Result	Execution time	Memory
897821		Dec0Dedd	Strange Device (APIO19_strange_device)	C++14	100 / 100	1377 ms	118904 KiB

strange_device

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pii;

void solve() {
    ll n, a, b; cin>>n>>a>>b;
    a/=__gcd(a, b+1);

    ll md=1e18+10;
    if (a <= LLONG_MAX/b) md=a*b;

    map<ll, ll> cnt;
    for (int i=1; i<=n; ++i) {
        ll lf, rf; cin>>lf>>rf;

        if (rf-lf+1 >= md) {
            cout<<md<<"\n";
            return;
        } lf%=md, rf%=md;

        if (lf <= rf) {
            ++cnt[lf], --cnt[rf+1];
        } else {
            ++cnt[lf], --cnt[md];
            ++cnt[0], --cnt[rf+1];
        }
    } vector<pii> v;
    for (auto u : cnt) v.push_back(u);

    ll ans=0, sz=v.size(), sm=0;
    for (int i=0; i+1<sz; ++i) {
        sm+=v[i].second;
        if (sm > 0) ans+=v[i+1].first-v[i].first;
    } cout<<ans<<"\n";
}

int main() {
    int t=1; //cin>>t;
    while (t--) solve();
}

• 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