Submission #677193

#	Time	Username	Problem	Language	Result	Execution time	Memory
677193		Iliya	Strange Device (APIO19_strange_device)	C++17	100 / 100	1094 ms	63256 KiB

strange_device

#include<bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define Sz(x) int((x).size())
#define All(x) (x).begin(), (x).end()

using namespace std;
typedef long long ll;
typedef long double ld;

const int N = 1e5 + 10;
const ll INF = 1e18;
const int MOD = 1e9 + 7;

ll gcd(ll a, ll b) {
	return !b ? a : gcd(b, a % b);
}

map<ll, ll> PS;
ll n, l, r, A, B, G, P, pos, ans, last;

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	
	scanf("%lld%lld%lld", &n, &A, &B);
	G = gcd(A, B + 1);
	P = (INF / B < A / G ? INF : A / G * B);
	for(int i = 0; i < n; i++) {
		scanf("%lld%lld", &l, &r);
		if(r - l + 1 >= P)
			return !(printf("%lld", P));
		l %= P, r %= P;
		if(l <= r) 
			PS[l]++, PS[r + 1]--;
		else 
			PS[0]++, PS[r + 1]--, PS[l]++, PS[P]--;
	}
	for(auto x : PS) {
		if(pos) ans += x.F - last;
		pos += x.S;
		if(pos) last = x.F;
	}
	printf("%lld", ans);

	return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |  scanf("%lld%lld%lld", &n, &A, &B);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:31:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |   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