제출 #963546

#제출 시각아이디문제언어결과실행 시간메모리
963546maxFedorchukArranging Shoes (IOI19_shoes)C++17
100 / 100
177 ms279632 KiB
#include <bits/stdc++.h> #include "shoes.h" using namespace std; const long long MX=2e5+5; queue < long long > st[2*MX]; long long fen[2*MX],a[2*MX]; long long n; void upd(long long in,long long zn) { while(in<=n) { fen[in]+=zn; in|=(in+1); } } long long fget(long long in) { long long rt=0; while(in>0) { rt+=fen[in]; in=(in&(in+1))-1; } return rt; } long long count_swaps(vector<int> s) { n=s.size(); for(long long i=0;i<n;i++) { a[i+1]=s[i]; } for(long long i=1;i<=n;i++) { upd(i,1); } long long ans=0; for(long long i=1;i<=n;i++) { if(!st[MX-a[i]].empty()) { long long l=st[MX-a[i]].front(); st[MX-a[i]].pop(); ans+=fget(i)-fget(l)-(a[i]>0); upd(i,-1); upd(l,1); } else { st[MX+a[i]].push(i); } } return ans; }
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