Submission #206585

#	Time	Username	Problem	Language	Result	Execution time	Memory
206585		kshitij_sodani	Strange Device (APIO19_strange_device)	C++17	65 / 100	894 ms	86900 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;
	set<pair<llo,llo>> ac;
	for(llo i=0;i<n;i++){
		cin>>aa>>bb;
		aa%=x;
		bb%=x;
		if(bb<aa){
			ac.insert(mp(aa,x-1));
			ac.insert(mp(0,bb));
		}
		else{
			ac.insert(mp(aa,bb));
		}

	}
	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;
	}
	cout<<tot<<endl;













	return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:63:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(llo i=0;i<prev.size();i++){
              ~^~~~~~~~~~~~

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