Submission #169002

#	Time	Username	Problem	Language	Result	Execution time	Memory
169002		kshitij_sodani	Strange Device (APIO19_strange_device)	C++17	5 / 100	704 ms	33152 KiB

strange_device

#include <iostream>
#include <bits/stdc++.h>
#include <stdio.h>
using namespace std;
typedef 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%=aa;
			it[i].a%=aa;
			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,aa-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 cc=aa*bb;
			for(llo i=0;i<n;i++){
				it[i].b%=cc;
				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;
						st=tt[i].a;
						end=tt[i].b;
					}
				}
			}
			tot+=end-st+1;
			cout<<tot<<endl;
		
	}

}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:46:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(llo i=0;i<tt.size();i++){
               ~^~~~~~~~~~
strange_device.cpp:83:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(llo i=0;i<tt.size();i++){
                ~^~~~~~~~~~
strange_device.cpp:99:12: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
    tot+=end-st+1;
         ~~~^~~
strange_device.cpp:99:12: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized]
strange_device.cpp:62:11: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
   tot+=end-st+1;
        ~~~^~~
strange_device.cpp:62:11: warning: 'st' may be used uninitialized in this function [-Wmaybe-uninitialized]

• 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