제출 #283544

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
283544		test2	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	1 ms	256 KiB

shoes

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

#define I inline void 


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) {

	map<int,vector<int> > mp ; 

	ll ret = 1e9 ; 

	vector<pair<int,int>> v ; 

	int pos = 0 ; 
	for(auto u : s){
		if(mp[-u].size()){
			v.push_back({mp[-u].back() , pos}) ; 
			mp[-u].pop_back() ; 
		}
		else{
			mp[u].push_back(pos) ; 
		}

		pos ++ ; 
	}
	int n = (int) s.size() ; 
	vector<int> per ; 
	for(int i = 0 ;i < n / 2 ;i ++){
		per.push_back(i) ; 
	}

	for(auto u : v){
		//cout<< u.first <<" " << u.second <<"..\n" ;
	}

	do{
		int k = 0;
		ll ret1 = 0 ; 
		for(int i = 0 ; i < n/2 ;i++){
			pair<int,int> u = v[per[i]] ; 
			int l = u.first , r = u.second ; 
			if(s[l] > s[r])
				swap(l , r) ; 
			ret1+= abs(k - l) ; 
			ret1+= abs((k+1) - r) ; 
			k+= 2; 
		} 
		ret = min(ret , ret1/2) ;

	}
	while(next_permutation(per.begin() , per.end())) ; 


	return ret;
}

컴파일 시 표준 에러 (stderr) 메시지

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:45:11: warning: variable 'u' set but not used [-Wunused-but-set-variable]
   45 |  for(auto u : v){
      |           ^

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