Submission #206593

#	Time	Username	Problem	Language	Result	Execution time	Memory
206593		kshitij_sodani	Strange Device (APIO19_strange_device)	C++17	35 / 100	849 ms	81768 KiB

strange_device

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define mp make_pair
#define pb push_back
typedef int64_t llo;
#define a first
#define  b second
#define endl "\n"
llo gcd(llo kk,llo ll){
	if(ll==0){
		return kk;
	}
	return gcd(ll,kk%ll);
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	llo n,a,b;
	cin>>n>>a>>b;
	llo x;
	pair<llo,llo> it;
	x=b;
	x*=(a/gcd(a,b+1));
/*	if((b+1)%a==0){
		x=b;
	}
	else{
		x=a*b;
	}*/


	llo aa,bb;
	llo s=0;
	set<pair<llo,llo>> ac;
	for(llo i=0;i<n;i++){
		cin>>aa>>bb;
		/*if(bb-aa+1>=x){
			cout<<x<<endl;
			return 0;
		}*/
		if(bb-aa+1>=x){
			ac.insert(mp(0,x-1));
		}
		aa%=x;
		bb%=x;
		if(bb<aa){
			ac.insert(mp(aa,x-1));
			ac.insert(mp(0,bb));
		}
		else{
			ac.insert(mp(aa,bb));
		}

	}
	if(s==1){
		cout<<x<<endl;
	}
	else{
		vector<pair<llo,llo>> prev;
		for(auto cc:ac){
			if(prev.size()==0){
				prev.pb(cc);
			}
			else{
				if(cc.a>prev.back().b){
					prev.pb(cc);
				}
				else{
					prev[prev.size()-1].b=max(prev[prev.size()-1].b,cc.b);
				}
			}
		}
		llo tot=0;
		for(llo i=0;i<prev.size();i++){
			tot+=prev[i].b-prev[i].a+1;
		}
		if(s==1 and tot<x){
			while(true){
				int y=1;
			}
		}

		cout<<tot<<endl;
	}













	return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:75:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(llo i=0;i<prev.size();i++){
               ~^~~~~~~~~~~~
strange_device.cpp:80:9: warning: unused variable 'y' [-Wunused-variable]
     int y=1;
         ^

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