답안 #933149

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
933149 2024-02-25T07:22:45 Z 8pete8 이상한 기계 (APIO19_strange_device) C++17
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#include<iostream>
#include<stack>
#include<map>
#include<vector>
#include<string>
#include<unordered_map>
#include <queue>
#include<cstring>
#include<cassert>
#include<limits.h>
#include<cmath>
#include<set>
#include<numeric> //gcd(a,b)
#include<algorithm>
#include<bitset> 
#include<stack>
using namespace std;
#define ll long long
#define f first
#define endl "\n"
#define s second
#define pii pair<int,int>
#define pppiiii pair<pii,pii>
#define ppii pair<int,pii>
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define pb push_back
//#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define fastio ios::sync_with_stdio(false);cin.tie(NULL);
#pragma GCC optimize ("03,unroll-loops")
#define int long long
const int mod=1e9+7,mxn=1e6,lg=30,inf=2e18+1,minf=-1e18,Mxn=2e6,root=700;
void setIO(string name){
	ios_base::sync_with_stdio(0); cin.tie(0);		
	freopen((name+".in").c_str(),"r",stdin);		
	freopen((name+".out").c_str(),"w",stdout);	
}	 
map<int,int>mp;
int GCD(int x, int y)
{
    if (y == 0) return x;
    return GCD(y, x%y);
}
int li[mxn+10],ri[mxn+10];
int32_t main(){
	fastio
	int n;cin>>n;
	int a,b;cin>>a>>b;
	int k;
	int sum=0;
	for(int i=0;i<n;i++)cin>>li[i]>>ri[i],sum+=ri[i]-li[i]+1;
	k=(a/GCD(a,b+1));
	int c=k/inf;
	if(c>b){
		cout<<sum;
		return 0;
	}
	else k=k*b;
	mp[0]=0;
	mp[k-1]=0;
	//if(k<=0)assert(0);
	for(int i=0;i<n;i++){
		int l=li[i],r=ri[i];
		l=(l%k);
		r=(r%k);
		mp[l-1]+=0;
		mp[l]+=1;
		if(r+1<k)mp[r+1]-=1;
		mp[r]+=0;
		if(l>r)mp[0]+=1;
	}
	int sum=0,ans=0,last=-1;
	for(auto i:mp){
		//if(i.f>k)break;
		sum+=i.s;
		if(sum>0)ans+=i.f-last;
		last=i.f;
	}
	cout<<ans;


	/*
	observation:
	y=t mod b
	x=(t+(k*b)+[t/b]+k)%a
	x=t+t[t/b]%a
	(k*(b+1))%a==0
	case 1 : (b+1)%a==0 -> k can be anything -> if y equal is equal ->k==1
	case 2 : k%a==0 -> k=g(a) -> k is a multiple of a ->val jump every k*b
	*|k=lcm(a,b+1)/(b+1)|*
	considering 1 range l,r
	first occurance of y=t mod b
 
	if r-l+1>k then it will cover all k
 
	block of b (range where all y value will be distinct)
	|		|		|		|
	if(k==2)
	block will be (range where all (x,y) value will be distinct)
	|				|				|
	
	find ways to count x%(k) 
	in a given set of range l,r
	l,r will cover a range of block
	can use prefix sum??
	*/
}

Compilation message

strange_device.cpp: In function 'int32_t main()':
strange_device.cpp:74:6: error: redeclaration of 'long long int sum'
   74 |  int sum=0,ans=0,last=-1;
      |      ^~~
strange_device.cpp:52:6: note: 'long long int sum' previously declared here
   52 |  int sum=0;
      |      ^~~
strange_device.cpp: In function 'void setIO(std::string)':
strange_device.cpp:37:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:38:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~