Submission #405042

#	Time	Username	Problem	Language	Result	Execution time	Memory
405042		A_D	Strange Device (APIO19_strange_device)	C++14	100 / 100	612 ms	72268 KiB

strange_device

#include <bits/stdc++.h>
#define int long long
#define ii pair<int,int>
#define F first
#define S second
#define du long double
using namespace std;
const int N=1e6+100;
ii a[N];
vector<int> l;
vector<int> r;
vector<ii> b;
set<ii> st;

void solve()
{
    int n,A,B,m=1e18+1;
    cin>>n>>A>>B;
    B++;
    du aa=A;
    du bb=B;
    du sum=aa*bb;
    du q=__gcd(A,B);
    du lcm=sum/q;
    lcm/=B;
    lcm*=B-1;
    if(lcm<=1e18){
        m=lcm;
    }
    for(int i=1;i<=n;i++){
        scanf("%lld",&a[i].F);
        scanf("%lld",&a[i].S);
        if(a[i].F+m<=a[i].S){
            b.push_back({0,m-1});
        }
        a[i].F%=m;
        a[i].S%=m;
        if(a[i].S<a[i].F){
            b.push_back({a[i].F,m-1});
            b.push_back({(int)0,a[i].S});
        }
        else{
            b.push_back({a[i].F,a[i].S});
        }
    }
    sort(b.begin(),b.end());
    l.push_back(b[0].F);
    r.push_back(b[0].S);
    for(int i=1;i<b.size();i++){
        int ll=l.back();
        int rr=r.back();
        if(!(ll>b[i].S||rr<b[i].F)){
            l.pop_back();
            r.pop_back();
            l.push_back(min(ll,b[i].F));
            r.push_back(max(rr,b[i].S));
        }
        else{
            l.push_back(b[i].F);
            r.push_back(b[i].S);
        }
    }
    int ans=0;
    for(int i=0;i<l.size();i++){
//        cout<<l[i]<<" "<<r[i]<<endl;
        ans+=r[i]-l[i]+1;
    }
    cout<<ans<<endl;
}
main()
{
    int t=1;
//    cin>>t;
    while(t--)solve();
}

Compilation message (stderr)

strange_device.cpp: In function 'void solve()':
strange_device.cpp:49:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |     for(int i=1;i<b.size();i++){
      |                 ~^~~~~~~~~
strange_device.cpp:64:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |     for(int i=0;i<l.size();i++){
      |                 ~^~~~~~~~~
strange_device.cpp: At global scope:
strange_device.cpp:70:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   70 | main()
      | ^~~~
strange_device.cpp: In function 'void solve()':
strange_device.cpp:31:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         scanf("%lld",&a[i].F);
      |         ~~~~~^~~~~~~~~~~~~~~~
strange_device.cpp:32:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         scanf("%lld",&a[i].S);
      |         ~~~~~^~~~~~~~~~~~~~~~

• 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