Submission #397857

#	Time	Username	Problem	Language	Result	Execution time	Memory
397857		Anand	Strange Device (APIO19_strange_device)	C++14	100 / 100	1899 ms	53408 KiB

strange_device

#include<bits/stdc++.h>

using namespace std;


int main()
{
    vector<pair<long long , long long>> v;
    long long n , a , b;
    cin >> n >> a >> b;

    long long s , f , ans = 0;

    a/=__gcd(a , b+1);

    if(a > 1e18/b) a = 1e18 + 1;
    else a = a * b;

    for(long long i = 0; i < n; i++)
    {
        long long l , r;
        cin >> l >> r;
        if(r - l + 1 >= a) v.push_back({0,a-1});
        else if((r % a) < (l % a)) {v.push_back({l % a , a - 1}); v.push_back({0 , r % a});}
        else v.push_back({l % a , r % a});
    }

    sort(v.begin(),v.end());

    s = v[0].first , f = v[0].second;

    for(int i = 1; i < v.size(); i++)
    {
        if(v[i].first>f) ans += f - s + 1 , tie(s , f) = v[i];
        else f = max(f,v[i].second);
    }
    cout << ans+f-s+1 << endl;;
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:32:22: 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]
   32 |     for(int i = 1; i < v.size(); 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