Submission #985049

#	Time	Username	Problem	Language	Result	Execution time	Memory
985049		SyedSohaib_123	Strange Device (APIO19_strange_device)	C++17	20 / 100	1077 ms	33216 KiB

strange_device

#include<bits/stdc++.h>
 
 
 
using namespace std;
 
 
 
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
 
 
 
#define str string
#define append push_back
#define vector deque
#define vi vector<int>
#define int long long
#define yes cout<<"YES"<<endl;
#define no cout<<"NO"<<endl;
#define endl '\n'
#define all(ls) ls.begin(),ls.end()
#define sorted(ls) sort(ls.begin(),ls.end());
#define reversed(ls) reverse(ls.begin(),ls.end());
#define print(n) for(auto i:n)cout<<i<<' ';cout<<endl;
#define input(n,ls,m) deque<n>ls(m);for(int i=0;i<m;i++)cin>>ls[i];
#define len(s) s.size()
#define ff first
#define ss second
#define N (int const) 3e5+1
#define pii pair<int,int>
#define SQ(x) ((x)*(x))
#define float double
 
 
int mod=1e9+7;
int mod1=998244353;
 
 
 
int sum_(vector<int>ls){int s=0;for(auto i:ls){s+=i;}return s;}
int min(int a,int b){if (a>b){return b;}return a;}
int max(int a,int b){if (a<b){return b;}return a;}
 
 
 
//......................................tHe ReaL cOdE beGinS HerE....................................../



int solve2(vector<pii> ls,int a,int b){
    map<pair<int,int>,bool>m;
    for(auto i:ls){
        for(int j=i.ff;j<=i.ss;j++){
            m[{(j+j/b)%a,j%b}]=1;
        }
    }
    return len(m);
}


 
void solve(){
    int n,a,b;
    cin>>n>>a>>b;
    vector<pii>ls;
    int cnt=0;
    for(int i=0;i<n;i++){
        int x,y;
        cin>>x>>y;
        cnt+=y-x+1;
        ls.append({x,y});
    }
    if(cnt<=1e6){cout<<solve2(ls,a,b)<<endl;return;}
    a/=gcd(a,b+1);
    a*=b;
    for(auto i:ls){
        if(i.ss-i.ff+1>=a){
            cout<<a<<endl;return;
        }
    }
    vector<pii>q;
    for(auto i:ls){
        int f=i.ff%a,s=i.ss%a;
        if(f<s or i.ff==i.ss) q.append({f,s});
        else{
            q.append({f,a-1});
            q.append({0,s});
        }
    }
    sorted(q);
    int ans=a-q[0].ff;
    int maxi=q[0].ss;
    for(int i=1;i<q.size();i++){
        if(q[i-1].ss<q[i].ff){
            ans-=q[i].ff-q[i-1].ss;
        }
        maxi=max(maxi,q[i].ss);
    }
    cout<<ans-(a-maxi-1)<<endl;
}
 
 
 
 
 
signed main(){
    int t=1;
    // cin>>t;
    while(t--)
        solve();
}

Compilation message (stderr)

strange_device.cpp: In function 'void solve()':
strange_device.cpp:95:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::deque<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |     for(int i=1;i<q.size();i++){
      |                 ~^~~~~~~~~

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