Submission #547586

#	Time	Username	Problem	Language	Result	Execution time	Memory
547586		LittleFlowers__	Strange Device (APIO19_strange_device)	C++17	0 / 100	5065 ms	212 KiB

strange_device

#include <algorithm>
#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
using namespace std;
int v2(ll n)
{
  int i = -1;
  while(n != 0)
  {
    n = n / 2;
    i++;
  }

}
int n, i, i1, i2, j, status = 0, idx;
pair<ll, ll> in[10000001];
pair<ll, ll> out[10000001];
ll a, b, tmp, l, r, cnt;
int main()
{
#define task "TASK"
  if(fopen(task".inp", "r")) {
    freopen(task".inp", "r", stdin);
    //freopen(task".out","w",stdout);
  }
  cin.tie(0)->sync_with_stdio(0);
  cin >> n >> a >> b;
  tmp = a / (__gcd(a, b + 1));


  i = 0;
  while(i < n)
  {
    cin >> in[i].fi >> in[i].se;
    i++;
  }



  if(v2(tmp) + v2(b) > 60)
  {
    i = 0;
    tmp = 0;
    while(i < n)
    {
      tmp = tmp + (in[i].se - in[i].fi + 1);
      i++;
    }
    cout << tmp;
  }




  else
  {
      return 0;
    tmp = tmp * b;
    //cout << tmp<<endl;
    i = 0;
    j = 0;
    while(i < n)
    {
      if(in[i].fi / tmp == in[i].se / tmp)
      {
        out[i + j].fi = in[i].fi % tmp;
        out[i + j].se = in[i].se % tmp;
      }
      else if((in[i].fi / tmp) + 1 == in[i].se / tmp)
      {
        out[i + j].fi = in[i].fi % tmp;
        out[i + j].se = tmp - 1;
        j++;
        out[i + j].fi = 0;
        out[i + j].se = in[i].se % tmp;
      }
      else
      {
        status = 1;
      }
      i++;
    }




    if(status == 1)
    {
      cout << tmp;
    }
    else
    {
      idx = i + j;
      //cout << idx<<endl;
      //i=0;
      //while (i<idx)
      //{
      //    cout << out[i].fi <<" "<< out[i].se << endl;
      //    i++;
      //}
      sort(out + 0, out + idx);
      l = out[0].fi;
      r = out[0].se;
      cnt = r - l + 1;
      i = 1;
      while(i < idx)
      {
        if(out[i].fi > out[i - 1].se)
        {
          l = out[i].fi;
          r = out[i].se;
          cnt = cnt + r - l + 1;
        }
        else
        {
          if(out[i].se <= out[i - 1].se)
          {

          }
          else
          {
            r = out[i].se;
            cnt = cnt + r - out[i - 1].se;
          }
        }
        i++;
      }
      cout << cnt;
    }

  }
}

Compilation message (stderr)

strange_device.cpp: In function 'int v2(long long int)':
strange_device.cpp:16:1: warning: no return statement in function returning non-void [-Wreturn-type]
   16 | }
      | ^
strange_device.cpp: In function 'int main()':
strange_device.cpp:25:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |     freopen(task".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• 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