Submission #1044633

#	Time	Username	Problem	Language	Result	Execution time	Memory
1044633		vjudge1	Strange Device (APIO19_strange_device)	C++17	100 / 100	280 ms	54044 KiB

strange_device

#include "bits/stdc++.h"
using namespace std;

#define int int64_t    
#define pb push_back

using lint=__int128_t;

const int lim=200100;
const int mod=1e9+7;

using pii=pair<int,int>;

signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#ifdef Local  
    freopen(".in","r",stdin);freopen(".out","w",stdout);
#endif
    int n,a,b;
    cin>>n>>a>>b;
    lint cntofdif=a/__gcd(a,(b+1));
    cntofdif*=b;
    cntofdif=min(cntofdif,lint(2e18));
    int all=cntofdif;
    //cerr<<all<<"\n";
    vector<pii>ranges;
    for(int i=0;i<n;i++){
        int l,r;
        cin>>l>>r;
        if(all<=r-l+1){
            cout<<all;
            return 0;
        }
        l%=all;
        r%=all;
        if(l<=r){
            ranges.pb({l,r});
            //cerr<<"inserted "<<l<<" "<<r<<"\n";
        }
        else{
            //cerr<<"oops "<<l<<" "<<r<<"\n";
            ranges.pb({l,all-1});
            ranges.pb({0,r});
        }
    }
    sort(ranges.begin(),ranges.end());
    int cnt=0,left=-1;
    for(auto[f,s]:ranges){
        if(left<f){
            cnt+=s-f+1;
        }else if(left<s){
            cnt+=s-left;
        }
        left=max(left,s);
    }
    cout<<cnt<<"\n";
}

• 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