Submission #283558

#	Time	Username	Problem	Language	Result	Execution time	Memory
283558		test2	Arranging Shoes (IOI19_shoes)	C++14	30 / 100	1076 ms	7416 KiB

shoes

#include<bits/stdc++.h>
//#include "shoes.h"
#include<ext/rope>
#define I inline void 

using namespace __gnu_cxx ; 

using namespace std ; 

using ll = long long ; 
using ld = long double ; 

const int N = 3000 + 7 , mod = 1e9 + 7 ;

// How interesting!

int n; 


long long count_swaps(std::vector<int> s) {

	int n = (int) s.size() ;
	ll ret = 0 ; 
	rope<int> shoes (n * 2 , 0) ; 
	for(int i = 0 ;i < n;i ++){
		shoes.mutable_reference_at(i) = s[i] ; 
	}

	for(int i = 0 ;i < n / 2; i++){	
		int pos = shoes.find(-shoes.mutable_reference_at(i)) ; 

		ret += pos - i - 1;  

		if( shoes[i] > 0 ){
			ret++ ;
		}
		shoes.erase(pos , 1) ; 

	}

	return ret;
}

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