Submission #231722

#	Time	Username	Problem	Language	Result	Execution time	Memory
231722		mohamedsobhi777	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	40 ms	3320 KiB

shoes

#include<bits/stdc++.h>
#include "shoes.h"

using namespace std ; 

const int N =1e5 + 7 ; 

int n; 

long long count_swaps(std::vector<int> s) {
        int val = abs(s[0]) ;   
        n = s.size() ; 
        int ret = 0 ; 
        for(int i = 0 ; i < n ;i++){
                s[i] = (s[i] > 0) ;
        }
        deque<int> dq ;
        int l = 1 ;
        int x = 0 ;   
        for(int i = 0 ;i < n;i++){

                if(s[i] == 1 - l){
                        ret+= abs(i - x++) ; 
                        l = 1 - l ; 
                }
                else{
                        dq.push_back(i) ; 
                }
                while(dq.size() && s[dq.front()] == 1 - l){
                        ret+=abs(dq.front() - x++) ; 
                        dq.pop_front() ; 
                        l = 1 - l ; 
                }                
        }
	return ret / 2;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:11:13: warning: unused variable 'val' [-Wunused-variable]
         int val = abs(s[0]) ;   
             ^~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15