Submission #169012

#	Time	Username	Problem	Language	Result	Execution time	Memory
169012		kshitij_sodani	Strange Device (APIO19_strange_device)	C++17	5 / 100	677 ms	34388 KiB

strange_device

#include <iostream>
#include <bits/stdc++.h>
#include <stdio.h>
using namespace std;
typedef   unsigned long long int llo;
#define pb push_back

#define a first
#define b second

#include <iostream>
#include <fstream>
#include <set>
#include <map>
#include <algorithm>
#include <vector>

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	llo n,aa,bb;
	cin>>n>>aa>>bb;
	pair<llo,llo> it[n];
	for(llo i=0;i<n;i++){
		cin>>it[i].a>>it[i].b;
	}
	if((bb+1)%aa==0){
		
		vector<pair<llo,llo>> tt;
		for(llo i=0;i<n;i++){
			it[i].b%=bb;
			it[i].a%=bb;
			if(it[i].a<=it[i].b){
				tt.pb(make_pair(it[i].a,it[i].b));
			}
			else{
				tt.pb(make_pair(it[i].a,bb-1));
				tt.pb(make_pair(0,it[i].b));
			}

		}
		sort(tt.begin(),tt.end());
		llo tot=0;
		llo st,end;
		for(llo i=0;i<tt.size();i++){
			if(i==0){
				st=tt[i].a;
				end=tt[i].b;
			}
			else{
				if(tt[i].a<=end){
					end=max(end,tt[i].b);
				}
				else{
					tot+=end-st+1;
					st=tt[i].a;
					end=tt[i].b;
				}
			}
		}
		tot+=end-st+1;
		cout<<tot<<endl;
	}
	else{

			vector<pair<llo,llo>> tt;
		/*	llo num[2];
			num[0]=0;
			num[1]=0;
			//llo co=0;
			llo aaa;
			llo aab;

			llo cc=aa*bb;
		//	int co=aa;
			aaa=aa%(1000000000);
			aab=(aa-aaa)/(1000000000);

			llo bba;
			llo bbb;
			bba=bb%(1000000000);
			bbb=(bb-bba)/(1000000000);
			num[0]+=aaa*bba;

			llo ccc=aaa*bbb;
			ccc=(ccc%1000000000)*(1000000000);
			num[0]+=ccc%1000000000;
			num[1]+=ccc/1000000000;

			ccc=aab*bba;
			ccc=(ccc%1000000000)*(1000000000);
			num[0]+=ccc%1000000000;
			num[1]+=ccc/1000000000;

			llo x=num[0]/1000000000000000000;

			num[0]%=1000000000000000000;
			num[1]+=x;
			num[1]+=bbb*aab;*/
			
			llo co=0;
			llo ac=aa;
			while(ac>0){
				ac/=10;
				co+=1;
			}
			llo bc=bb;
			while(bc>0){
				bc/=10;
				co+=1;
			}
			llo cc;
		//	cout<<co<<endl;
			if(co<=(llo)19){
				cc=aa*bb;
			}
		//	cout<<cc<<endl;
		//	cout<<"done";
			for(llo i=0;i<n;i++){
				if(co<=19){
					it[i].b%=cc;
				}
				if(co<=19){
					it[i].a%=cc;
				}
			//	it[i].b%=bb;

				
			//	it[i].a%=bb;
				//it[i].a%=cc;
				if(it[i].a<=it[i].b){
					tt.pb(make_pair(it[i].a,it[i].b));
				}
				else{
					tt.pb(make_pair(it[i].a,cc-1));
					tt.pb(make_pair(0,it[i].b));
				}

			}
			sort(tt.begin(),tt.end());
			llo tot=0;

			llo st,end;
			for(llo i=0;i<tt.size();i++){
				if(i==0){
					st=tt[i].a;
					end=tt[i].b;
				}
				else{
					if(tt[i].a<=end){
						end=max(end,tt[i].b);
					}
					else{
						tot+=end-st+1;
						//tot+=end-st+1;
						st=tt[i].a;
						end=tt[i].b;
					//	cout<<tot[1]<<" "<<tot[0]<<endl;
					}

				}
			}
		//	cout<<aaa<<" "<<aab<<" "<<bba<<" "<<bbb<<endl;
		//	cout<<num[1]<<" "<<num[0]<<endl;
			tot+=end-st+1;
			cout<<tot;
			cout<<endl;
		
	}

}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:144:11: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
    llo st,end;
           ^~~
strange_device.cpp:166:7: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized]
    tot+=end-st+1;
    ~~~^~~~~~~~~~
strange_device.cpp:125:13: warning: 'cc' may be used uninitialized in this function [-Wmaybe-uninitialized]
      it[i].a%=cc;
      ~~~~~~~^~~~
strange_device.cpp:45:10: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
   llo st,end;
          ^~~
strange_device.cpp:62:6: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized]
   tot+=end-st+1;
   ~~~^~~~~~~~~~

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