Submission #781780

#	Time	Username	Problem	Language	Result	Execution time	Memory
781780		andecaandeci	Strange Device (APIO19_strange_device)	C++17	0 / 100	665 ms	118824 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,a,b;
ll l[1000005],r[1000005];
ll gcd (ll a, ll b){
    if (b==0) return a;
    return gcd(b,a%b);
}
ll lcm(ll a, ll b){
    return a/gcd(a,b)*b;
}
int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin>>n>>a>>b;
    ll t=1000005;
    ll x;
    // if ((b+1)%a==0){
    //     if (b>1000005){
    //         t=1000005;
    //     }
    //     else
    //         t=b;
    // }
    // else{
    //     if (b>1000005||a>1000005||a*b>1000005){
    //         t=1000005;
    //     }
    //     else
    //         t=a*b;
    // }
    // cout<<t;
    for (int i=b;i<=1000005;i++){
        if((i+(i/b))%a==0&&i%b==0){
            t=i;
            break;
        }
        // cout<<i<<endl;
    }
    if (lcm(t,b)<1000005)
        t=lcm(t,b);
    // cout<<t;
    set <pair<ll,ll>> st;
    for (int i=1;i<=n;i++){
        cin>>l[i]>>r[i];
        ll u=r[i]-l[i]+1;
        if (u>=t){
            l[i]=0;
            r[i]=t-1;
        }
        else{
            ll q=r[i]-l[i];
            ll p=l[i]%t;
            l[i]=p;
            r[i]=l[i]+q;
        }
        if (r[i]<=t-1){
            st.insert({l[i],r[i]});
            // cout<<l[i]<<" "<<r[i]<<endl;
        }
        else{
            st.insert({l[i],t-1});
            // cout<<l[i]<<" "<<t-1<<endl;
            st.insert({0,(u-(t-l[i]))-1});
            // cout<<0<<" "<<(u-(t-l[i]))-1<<endl;
        }
        // cout<<l[i]<<" "<<r[i]<<endl;
    }
    vector <pair<ll,ll>> pasang;
    for (auto z:st){
        pasang.push_back(z);
        // cout<<z.first<<" "<<z.second<<endl;
    }
    sort(pasang.begin(),pasang.begin()+n);
    vector <pair<ll,ll>> jawab;
    ll last=pasang[0].second,previous=pasang[0].first;
    pasang.push_back({(ll)1e18+100,(ll)1e18+100});
    sort(pasang.begin(),pasang.end());
    for (int i=1;i<pasang.size();i++){
        if (pasang[i].first<=last){
            last=max(last,pasang[i].second);
        }
        else{
            jawab.push_back({previous,last});
            previous=pasang[i].first;
            last=max(last,pasang[i].second);
        }
    }
    // if (previous>jawab[jawab.size()-1].second){
    //     // jawab.push_back({previous,last});
    // }
    ll ans=0;
    for (int i=0;i<jawab.size();i++){
        ans+=jawab[i].second-jawab[i].first+1;
        // cout<<jawab[i].first<<" "<<jawab[i].second<<":::"<<endl;
    }
    cout<<"  "<<ans;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:79:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |     for (int i=1;i<pasang.size();i++){
      |                  ~^~~~~~~~~~~~~~
strange_device.cpp:93:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   93 |     for (int i=0;i<jawab.size();i++){
      |                  ~^~~~~~~~~~~~~
strange_device.cpp:17:8: warning: unused variable 'x' [-Wunused-variable]
   17 |     ll x;
      |        ^

• 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