Submission #649763

#	Time	Username	Problem	Language	Result	Execution time	Memory
649763		ToroTN	Strange Device (APIO19_strange_device)	C++14	65 / 100	516 ms	24524 KiB

strange_device

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define X first
#define Y second
#define pb push_back
ll n,a,b,x,y,md,cnt=0,mx=-1,l,r;
set<pair<ll,ll> > s;
vector<pair<ll,ll> > v;
int main()
{
    scanf("%lld%lld%lld",&n,&a,&b);
    /*for(int i=1;i<=100;i++)
    {
        printf("%d %d %d\n",i,(i+i/b)%a,i%b);
    }*/
    //printf("%d\n",s.size());
    md=b*a/__gcd(b+1,a);
    for(int i=1;i<=n;i++)
    {
        scanf("%lld%lld",&x,&y);
        x%=md;
        y%=md;
        if(x<=y)
        {
            v.pb({x,y});
        }else
        {
            v.pb({x,md-1});
            v.pb({0,y});
        }
    }
    sort(v.begin(),v.end());
    for(int i=0;i<v.size();i++)
    {
        l=v[i].X;
        r=v[i].Y;
        if(l>mx)
        {
            cnt+=(r-l+1);
            mx=r;
        }else
        {
            if(r>mx)
            {
                cnt+=r-mx;
                mx=r;
            }
        }
    }
    printf("%lld\n",cnt);
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:34:18: 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]
   34 |     for(int i=0;i<v.size();i++)
      |                 ~^~~~~~~~~
strange_device.cpp:12:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |     scanf("%lld%lld%lld",&n,&a,&b);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:21:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         scanf("%lld%lld",&x,&y);
      |         ~~~~~^~~~~~~~~~~~~~~~~~

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