Submission #250334

#	Time	Username	Problem	Language	Result	Execution time	Memory
250334		_7_7_	Strange Device (APIO19_strange_device)	C++14	100 / 100	797 ms	45168 KiB

strange_device

#include <bits/stdc++.h>                                           
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
 

using namespace std;
using namespace __gnu_pbds;
#define int long long
//#pragma GCC optimize("Ofast")
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4")
 
 
#define file(s) freopen(s".in","r",stdin); freopen(s".out","w",stdout);
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define all(x) x.begin(), x.end()
#define sz(s) (int)s.size()
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define s second
#define f first
 
 

 
 
typedef pair < long long, long long > pll;    
typedef pair < int, int > pii;
typedef unsigned long long ull;         
typedef vector < pii > vpii;
typedef vector < int > vi;
typedef long double ldb;  
typedef long long ll;  
typedef double db;                             
 
typedef tree<pii, null_type, less<pii>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
 
const int dx[] = {1, -1, 0, 0}, dy[] = {0, 0, 1, -1}, block = 555;
const pii base = mp(1171, 3307), Mod = mp(1e9 + 7, 1e9 + 9);
const int inf = 1e9, maxn = 4e5 + 148, mod = 1e9 + 7, N = 2e5 + 11;
const db eps = 1e-12, pi = 3.14159265359;
const ll INF = 1e18;


int n, a, b, l, r;
vpii v;


main () {
	fastio
	scanf("%lld%lld%lld", &n, &a, &b);

	int g = __gcd(a, b + 1);
	a /= g;
	if (a <= 2*INF / b)
		a *= b;
	else
		a = 2*INF;

	while (n--) {
		scanf("%lld%lld", &l, &r);
		if (r - l + 1 >= a) {
			cout << a << endl;
			return 0;
		}

		l %= a;
		r %= a;
		if (l > r) {
			v.pb({0ll, 1ll});
			v.pb({r + 1, -1ll});
			v.pb({l, 1ll});
			v.pb({a, -1ll});
		} else {
			v.pb({l, 1ll});
			v.pb({r + 1, -1ll});
		}
	}
	
	sort(all(v));


	int ans = 0, cur = 0;
	for (int i = 0; i < sz(v); ++i) {
		if (cur > 0) 
			ans += v[i].f - v[i - 1].f;			
		cur += v[i].s;
	}

	cout << ans << endl;
}

Compilation message (stderr)

strange_device.cpp:50:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () {
       ^
strange_device.cpp: In function 'int main()':
strange_device.cpp:52:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld%lld", &n, &a, &b);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:62:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld", &l, &r);
   ~~~~~^~~~~~~~~~~~~~~~~~~~

• 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