제출 #873513

#제출 시각아이디문제언어결과실행 시간메모리
873513CutebolArranging Shoes (IOI19_shoes)C++17
10 / 100
0 ms444 KiB
#include "shoes.h" #include <bits/stdc++.h> using namespace std ; const int N = 2e5 + 5 ; map <int , set <int>> l , r ; bool f[N] ; long long count_swaps(vector<int> s) { int n = s.size() , ans = 0 , cnt = 0 ; for ( int i = 0 ; i < n ; i ++ ){ if ( s[i] < 0 ) l[-s[i]].insert(i) ; else r[s[i]].insert(i) ; } for ( int i = 0 ; i < n ; i ++ ){ if ( f[i] == 1 ) continue ; if ( s[i] < 0 ){ int ind = *r[-s[i]].begin() ; r[-s[i]].erase(r[-s[i]].begin()) ; ans += (ind+cnt)-(i+1+cnt) ; f[ind] = 1 ; } else{ int ind = *l[s[i]].begin() ; l[s[i]].erase(l[s[i]].begin()) ; ans += (ind+cnt)-(i+1+cnt)+1 ; f[ind] = 1 ; } cnt ++ ; } return ans ; }
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