Submission #721626

#	Time	Username	Problem	Language	Result	Execution time	Memory
721626		victor_gao	Strange Device (APIO19_strange_device)	C++17	10 / 100	592 ms	7072 KiB

strange_device

//#pragma GCC optimize("Ofast,unroll-loops,O3")
//#pragma GCC optimize("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma,tune=native")
#include<bits/stdc++.h>
//#include<bits/extc++.h>
//#pragma pack(1)
#define fast ios::sync_with_stdio(0); cin.tie(0);
#define int long long
#define pii pair<int,int>
#define x first
#define y second
using namespace std;
//using namespace __gnu_pbds;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//typedef tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update> order_multiset;
//typedef tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> order_set;
int n,a,b,t;
int findt(){
    if (a<b&&(b+1)%a==0) return b;
    int go=b+1,g=__gcd(go,a);
   // cout<<go<<" "<<a<<' '<<b<<" "<<g<<'\n';
    // lcm(go,a)/go*b
    if ((double)(log10(a/g)+log10(b))>=18.0001) return 2e18;
    else return a/g*b;
}
set<pii>st;
void add(int l,int r){
    if (st.empty()){
        st.insert(pii(l,r-l+1));
        return;
    }
    auto it=st.insert(pii(l,r-l+1)).x;
    pii now={l,r-l+1};
    while (it!=st.begin()){
        auto it1=prev(it);
        pii last=*it1;
        if (last.x+last.y>=l){
            st.erase(it1);
            it=st.erase(it);
            now.y=(now.x+now.y-1)-last.x+1;
            now.x=last.x;
            it=st.insert(now).x;
        }
        else break;
    }
    while (it!=st.end()){
        auto it1=next(it);
        if (it1==st.end()) break;
        pii nxt=*it1;
        if (now.x+now.y>=nxt.x){
            st.erase(it1);
            it=st.erase(it);
            now.y=(nxt.x+nxt.y-1)-now.x+1;
            it=st.insert(now).x;
        }
        else break;
    }
}
signed main(){
    fast
    cin>>n>>a>>b;
    t=findt();
    if (t>(int)1e18){
        int ans=0;
        for (int i=1;i<=n;i++){
            int l,r; cin>>l>>r;
            ans+=(r-l+1);
        }
        cout<<ans<<'\n';
    }
    else {
        for (int i=1;i<=n;i++){
            int l,r; cin>>l>>r;
            l%=t; r%=t;
            if (l>r){
                add(l,t-1);
                add(0,r);
            }
            else add(l,r);
        }
        int ans=0;
        for (auto i:st){
            ans+=i.y;
           // cout<<i.x<<" ~ "<<i.x+i.y-1<<'\n';
        }
        cout<<ans<<'\n';
    }
}

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