Submission #543137

#	Time	Username	Problem	Language	Result	Execution time	Memory
543137		OttoTheDino	Strange Device (APIO19_strange_device)	C++17	0 / 100	32 ms	340 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
int main(){
long long n, a, b, ans=0;
cin>>n>>a>>b;
if (log(a)+log(b)>log(__gcd(a,b+1))+log(1e18)){
    for (int i =0; i<n; ++i){
        long long li,ri;cin>>li>>ri;
        ans += ri-li+1;
    }
    cout<<ans<<endl;
    return 0;
}
long long s = a/__gcd(a,b+1)*b;
set<pair<long long, long long>> st;
for (int i = 0; i<n;++i){
    int li, ri; cin >> li >> ri;
    if (ri-li>=s) st.insert({0,s-1});
    else if (ri%s<li%s){
        st.insert({0,ri%s});
        st.insert({li%s,s-1});
    }
    else st.insert({li%s,ri%s});
}
ans =s;
long long x = -1;
for (auto el : st) {
    ans -= max (el.first-x-1, 0LL);
    x = max (x, el.second);
}
ans -= s-1-x;
cout << ans << endl;
return 0;
}

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