Submission #382993

#	Time	Username	Problem	Language	Result	Execution time	Memory
382993		Kalashnikov	Strange Device (APIO19_strange_device)	C++17	100 / 100	746 ms	35876 KiB

strange_device

#include <bits/stdc++.h>
 
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define all(a) a.begin() , a.end()
#define F first
#define S second
 
using namespace std;
using ll = long long;
 
const int N = 2e5+5 , inf = 2e9 + 7;
const ll INF = 1e18 ,   mod = 1e9+7 , P = 6547;

void solve() {
	ll n, A , B , l , r , ans = 0 , cur = 0;
	cin >> n >> A >> B;
	ll L = A / __gcd(A , B+1);
	if(L > 1e18/B) {
		for(int i = 1; i <= n; i ++) {cin >> l >> r; ans += r-l+1;}
		cout << ans;
		return;
	}
	L *= B;
	vector<pair<ll,ll>> v;
	for(int i = 1; i <= n; i ++) {
		cin >> l >> r;
		if(r-l+1 > L) {
			cout << L;
			return;
		}

		l %= L;
		r %= L;
		if(l > r) {
			v.push_back({0 , 1});
			v.push_back({r+1 , -1});
			v.push_back({l , 1});
			v.push_back({L , -1});
		}
		else {
			v.push_back({l , 1});
			v.push_back({r+1 , -1});
		}
	}
	sort(all(v));
	for(int i = 0; i < v.size(); i ++) {
		while(i+1 < v.size() && v[i].F == v[i+1].F) {
			cur += v[i].S;
			i ++;
		}
		cur += v[i].S;
		if(cur) ans += v[i+1].F - v[i].F;
	}
	cout << ans;
}
/*
*/
main() {
    ios;
    int tt = 1;
    //cin >> tt;
    while(tt --) {
        solve();
    }
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'void solve()':
strange_device.cpp:47:19: 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]
   47 |  for(int i = 0; i < v.size(); i ++) {
      |                 ~~^~~~~~~~~~
strange_device.cpp:48:13: 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]
   48 |   while(i+1 < v.size() && v[i].F == v[i+1].F) {
      |         ~~~~^~~~~~~~~~
strange_device.cpp: At global scope:
strange_device.cpp:59:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   59 | main() {
      |      ^

• 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