Submission #932227

#	Time	Username	Problem	Language	Result	Execution time	Memory
932227		Baizho	Strange Device (APIO19_strange_device)	C++17	10 / 100	427 ms	18744 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
  
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
 
// #pragma GCC optimize("Ofast,unroll-loops,fast-math")
// #pragma GCC target("popcnt")
 
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll,ll> pll;
 
#define sz size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define pb push_back
 
const int mod = ll(1e9)+7; //(b + (a%b)) % b (to mod -1%(10^9+7) correctly in c++ its -1 but its suppose to be 10^9+6
const ll MOD = 998244353;  // (a%mod)*(binpow(b,mod-2,mod) = (a/b)%mod
const int N = ll(2e3)+100;
const int M = ll(2e5) + 100;
const long long inf = 5e18;
const long double eps = 1e-15L;
 
ll lcm(ll a, ll b) { return (a / __gcd(a,b))*b; }
 
ll binpow(ll a, ll b, ll m) { ll res=1; a %= m; while(b>0){ if(b&1)res=(res * a) % m; a=(a * a) % m; b/=2; } return res%m;}
 
void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
 
#define int ll

bool comp(pair<int, int> a, pair<int, int> b) {
	if(a.ss == b.ss) return a.ff > b.ff;
	return a.ss < b.ss;
}

void Baizho() {
	int n, a, b; cin>>n>>a>>b;
	int siz = a / __gcd(a, b + 1);
	if(siz <= 1LL * 2e18 / b)	siz *= b;
	else siz = 2e18;
	vector<pair<int, int> > range;
	while(n --) {
		int l, r; cin>>l>>r;
		l %= siz; r %= siz;
		if(l <= r) {
			range.pb({l, r});
		} else {
			range.pb({0, r});
			range.pb({l, siz - 1});
		}
	}
	sort(all(range), comp);
	int maxr = -1, ans = 0;
	for(auto c : range) {
		if(maxr < c.ff) {
			// new segment started
			ans += c.ss - c.ff + 1;
			maxr = c.ss;
		} else if(c.ff <= maxr && maxr <= c.ss) {
			// not completely new
			ans += c.ss - maxr;
			maxr = c.ss;
		}
	}
	cout<<ans<<"\n";
}
 
signed main() {		
// 	Freopen("nondec");
    ios_base::sync_with_stdio(false);   
    cin.tie(0);cout.tie(0); 
//   	precalc();
   	
    int ttt = 1;
//    cin>>ttt;
 
    for(int i=1; i<=ttt; i++) {Baizho(); }
}

Compilation message (stderr)

strange_device.cpp: In function 'void Freopen(std::string)':
strange_device.cpp:35:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:35:76: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 5
• Subtask 3: 0 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30