Submission #304825

#	Time	Username	Problem	Language	Result	Execution time	Memory
304825		Hemimor	Strange Device (APIO19_strange_device)	C++14	100 / 100	799 ms	69148 KiB

strange_device

#include <algorithm>
#include <iostream>
#include <iomanip>
#include <numeric>
#include <cassert>
#include <bitset>
#include <vector>
#include <cmath>
#include <queue>
#include <stack>
#include <set>
#include <map>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<P,int> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-8;
const ll mod=1e9+7;
const int dx[4]={-1,0,1,0},dy[4]={0,-1,0,1};

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

typedef __int128 b128;

int n;
ll A,B,res=0;

int main(){
	scanf("%d%lld%lld",&n,&A,&B);
	b128 m=A/gcd(A,B+1)*b128(B);
	vector<pair<ll,int>> a;
	for(int i=0;i<n;i++){
		ll l,r;
		scanf("%lld%lld",&l,&r);
		if(r-l+1>=m){
			cout<<(ll)m<<endl;
			return 0;
		}
		l%=m,r%=m;
		r++;
		a.push_back({l,1});
		a.push_back({r,-1});
		if(l>r){
			a.push_back(make_pair(0LL,1));
			a.push_back(make_pair((ll)m,-1));
		}
	}
	sort(a.begin(),a.end());
	ll N=a.size(),x=0,s=0;
	for(int i=0;i<N;i++){
		ll y=a[i].first,t=a[i].second;
		if(s) res+=y-x;
		x=y,s+=t;
	}
	printf("%lld\n",res);
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:51:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   51 |  scanf("%d%lld%lld",&n,&A,&B);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:56:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |   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