Submission #399078

#	Time	Username	Problem	Language	Result	Execution time	Memory
399078		amunduzbaev	Strange Device (APIO19_strange_device)	C++14	100 / 100	635 ms	69076 KiB

strange_device

/* made by amunduzbaev */
 
#include <bits/stdc++.h>
 
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
 
using namespace std;
//using namespace __gnu_pbds;
 
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define NeedForSpeed ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define vv vector
#define tut(x) array<int, x> 
#define int long long
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii; 
typedef vector<int> vii;
typedef vector<pii> vpii;
 
template<class T> bool umin(T& a, const T& b) { return a > b? a = b, true:false; }
template<class T> bool umax(T& a, const T& b) { return a < b? a = b, true:false; }
//void usaco(string s) { freopen((s+".in").c_str(),"r",stdin);  
	//freopen((s+".out").c_str(),"w",stdout); }
//template<class T> tree<T, 
//less<T>, null_type, rb_tree_tag, 
//tree_order_statistics_node_update> ordered_set;
 
const int N = 1e6+5;
const int mod = 1e9+7;
const ll inf = 1e18;
const ld Pi = acos(-1);
 
#define MULTI 0
int n, m, K, s, ans, q, res, a;
int b, l[N], r[N];

bool cmp(pii a, pii b){
	if(a.ff != b.ff) return a.ff < b.ff;
	else return a.ss > b.ss;
}

void solve(int t_case){
	cin>>n>>a>>b;
	
	int cyc = a / __gcd(a, b+1);
	if(cyc > inf / b) cyc = inf;
	else cyc = cyc * b;
	
	vpii tt;
	
	for(int i=0;i<n;i++){
		cin>>l[i]>>r[i];
		if(r[i] - l[i] + 1 >= cyc){
			cout<<cyc<<"\n";
			return;
		}
		
		int lx = l[i] % cyc, rx = r[i] % cyc;
		if(lx <= rx) tt.pb({lx, rx});
		else tt.pb({lx, cyc - 1}), tt.pb({0, rx});
	}	
	
	sort(all(tt));
	
	int lx = -1, rx = -1;
	
	for(auto x : tt){
		if(x.ff > rx){
			if(~lx && ~rx) res += (rx - lx + 1);
			lx = x.ff, rx = x.ss;
		} else umax(rx, x.ss);
	}
	if(~lx && ~rx) res += (rx - lx + 1);
	cout<<res<<"\n";
}

signed main(){ 
	NeedForSpeed
	if(!MULTI) {
		solve(1);
	} else {
		int t; cin>>t;
		for(int t_case = 1; t_case <= t; t_case++) solve(t_case);
	} return 0;
}

• 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