Submission #369486

#	Time	Username	Problem	Language	Result	Execution time	Memory
369486		ali_tavakoli	Strange Device (APIO19_strange_device)	C++14	100 / 100	667 ms	53492 KiB

strange_device

//In The Name Of Allah
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
#define pb push_back
#define F first
#define S second
#define pll pair<ll, ll>
//#pragma GCC optimize("Ofast")

const int maxn = 1e6 + 5;
const ll inf = 1e18 + 5;

bool cmp(pll x, pll y)
{
    if(x.F != y.F)
        return x.F < y.F;
    return x.S > y.S;
}

ll n, A, B, g, ans;
vector<pll> seg;

int main()
{
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> A >> B;
    g = A / __gcd(A, B + 1);
    if(inf / g < B)
        g = inf;
    else
        g = g * B;
    
    //cout << g << '\n';
    for(int i = 0; i < n; i++)
    {
        ll l, r;
        cin >> l >> r;
        if(r - l + 1 >= g)
            seg.pb({0, g - 1});
        else if(l % g <= r % g)
            seg.pb({l % g, r % g});
        else
        {
            seg.pb({l % g, g - 1});
            seg.pb({0, r % g});
        }
    }
    sort(seg.begin(), seg.end(), cmp);
    for(int i = 1; i < seg.size(); i++)
        if(seg[i].F <= seg[i - 1].S)
        {
            seg[i].F = min(seg[i].F, seg[i - 1].F);
            seg[i].S = max(seg[i].S, seg[i - 1].S);
            seg[i - 1] = {1, 0};
        }
    for(auto x : seg)
        ans += x.S - x.F + 1;
    //sort(seg.begin(), seg.end());
    cout << ans << '\n';
}

/*
3 3 3
4 4
7 9
17 18


3 5 10
1 20
50 68
89 98

2 16 13
2 5
18 18
*/

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:51:22: 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]
   51 |     for(int i = 1; i < seg.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