oj.uz

Submission #933132

# Submission time Handle Problem Language Result Execution time Memory
933132 2024-02-25T06:42:06 Z 8pete8 Strange Device (APIO19_strange_device) C++17
35 / 100
 1055 ms 125888 KB 
#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=2e5,lg=30,inf=2e18,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;
int32_t main(){
	fastio
	int n;cin>>n;
	int a,b;cin>>a>>b;
	int k=(a*(b+1))/gcd(a,b+1);
	k=(k/(b+1));
	k=min(inf,k*b);
	mp[k-1]=0;
	mp[0]=0;
	bool yes=false;
	for(int i=0;i<n;i++){
		int l,r;cin>>l>>r;
//		if(r-l+1>k)yes=true;
		l%=k,r%=k;
		mp[l-1]+=0;
		mp[l]+=1,mp[r+1]-=1;
		mp[r]+=0;
		if(l>r)mp[0]+=1;
	}
	if(yes)return cout<<k<<'\n',0;
	int sum=0,ans=0,last=-1;
	for(auto i:mp){
		if(i.f>=k)break;
		sum+=i.s;
		if(sum)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%(a*b) or x%b
	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 '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);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 6 ms 1628 KB Output is correct
3 Correct 6 ms 1628 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 6 ms 1624 KB Output is correct
17 Correct 57 ms 6740 KB Output is correct
18 Incorrect 0 ms 348 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Incorrect 0 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 604 KB Output is correct
3 Correct 1 ms 604 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 173 ms 436 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 605 ms 63028 KB Output is correct
3 Correct 829 ms 125864 KB Output is correct
4 Correct 950 ms 125572 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 605 ms 63028 KB Output is correct
3 Correct 829 ms 125864 KB Output is correct
4 Correct 950 ms 125572 KB Output is correct
5 Correct 0 ms 344 KB Output is correct
6 Correct 783 ms 125712 KB Output is correct
7 Correct 649 ms 63280 KB Output is correct
8 Correct 790 ms 125724 KB Output is correct
9 Correct 1055 ms 125676 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 605 ms 63028 KB Output is correct
3 Correct 829 ms 125864 KB Output is correct
4 Correct 950 ms 125572 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 60 ms 12856 KB Output is correct
7 Correct 61 ms 12884 KB Output is correct
8 Correct 63 ms 13100 KB Output is correct
9 Correct 69 ms 12876 KB Output is correct
10 Correct 61 ms 12884 KB Output is correct
11 Correct 61 ms 12884 KB Output is correct
12 Correct 63 ms 13000 KB Output is correct
13 Correct 70 ms 12884 KB Output is correct
14 Correct 61 ms 12884 KB Output is correct
15 Correct 73 ms 12880 KB Output is correct
16 Correct 74 ms 12992 KB Output is correct
17 Correct 80 ms 12916 KB Output is correct
18 Correct 746 ms 125500 KB Output is correct
19 Correct 927 ms 125688 KB Output is correct
20 Correct 959 ms 125532 KB Output is correct
21 Correct 66 ms 12828 KB Output is correct
22 Correct 86 ms 12728 KB Output is correct
23 Correct 81 ms 432 KB Output is correct

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 73 ms 12880 KB Output is correct
3 Correct 76 ms 12884 KB Output is correct
4 Correct 962 ms 125888 KB Output is correct
5 Correct 76 ms 12848 KB Output is correct
6 Correct 77 ms 12968 KB Output is correct
7 Correct 74 ms 12884 KB Output is correct
8 Correct 73 ms 12816 KB Output is correct
9 Correct 71 ms 12748 KB Output is correct
10 Correct 65 ms 12880 KB Output is correct
11 Correct 69 ms 12884 KB Output is correct
12 Correct 68 ms 12944 KB Output is correct
13 Correct 74 ms 12792 KB Output is correct
14 Correct 1018 ms 125672 KB Output is correct
15 Correct 62 ms 12884 KB Output is correct
16 Correct 741 ms 125512 KB Output is correct
17 Correct 741 ms 125720 KB Output is correct
18 Incorrect 0 ms 344 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #8
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 6 ms 1628 KB Output is correct
3 Correct 6 ms 1628 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 6 ms 1624 KB Output is correct
17 Correct 57 ms 6740 KB Output is correct
18 Incorrect 0 ms 348 KB Output isn't correct
19 Halted 0 ms 0 KB -