Submission #713522

#	Time	Username	Problem	Language	Result	Execution time	Memory
713522		bin9638	Strange Device (APIO19_strange_device)	C++17	100 / 100	668 ms	51752 KiB

strange_device

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
#define N 2000010
#define ii pair<int,int>
#define fs first
#define sc second
#define ld double
#define int ll

const int MAX_VAL=2e18;

int S,cnt[N],n,A,B,dem=0,ans=0;
vector<int>s;

void sub_AB()
{
    int res=0;
    for(int i=1;i<=n;i++)
    {
        int l,r;
        cin>>l>>r;
        res+=(r-l+1);
    }
    cout<<res;
    exit(0);
}

ii a[N];

int32_t main()
{
    #ifdef SKY
    freopen("A.inp","r",stdin);
    freopen("A.out","w",stdout);
    #endif // SKY
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n>>A>>B;
    if(MAX_VAL/B<=A/__gcd(A,B+1))
        sub_AB();
    S=B*(A/__gcd(A,B+1));
    for(int i=1;i<=n;i++)
    {
        int l,r;
        cin>>l>>r;
        if(r-l+1>=S)
        {
            cout<<S;
            return 0;
        }
        int lef=l%S,righ=r%S;
        if(lef<=righ)
        {
            a[++dem]={lef,righ};
        }else
        {
            a[++dem]={lef,S-1};
            a[++dem]={0,righ};
        }
    }
    for(int i=1;i<=dem;i++)
    {
        s.pb(a[i].fs);
        s.pb(a[i].sc+1);
    }
    sort(s.begin(),s.end());
    s.erase(unique(s.begin(),s.end()),s.end());
    for(int i=1;i<=dem;i++)
    {
        cnt[lower_bound(s.begin(),s.end(),a[i].fs)-s.begin()]++;
        cnt[lower_bound(s.begin(),s.end(),a[i].sc+1)-s.begin()]--;
    }
    for(int i=0;i<s.size()-1;i++)
    {
        if(i>0)
            cnt[i]+=cnt[i-1];
        if(cnt[i]>0)
            ans+=(s[i+1]-s[i]);
    }
    cout<<ans;
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int32_t main()':
strange_device.cpp:78:18: 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]
   78 |     for(int i=0;i<s.size()-1;i++)
      |                 ~^~~~~~~~~~~

• 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