제출 #144057

#제출 시각아이디문제언어결과실행 시간메모리
144057LyestriaArranging Shoes (IOI19_shoes)C++14
100 / 100
438 ms273080 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; const int mn=2e5+10; queue<int>pos[mn],neg[mn]; int par[mn]; int bit[mn]; void up(int a,int b){for(;a<mn;a+=a&-a)bit[a]+=b;} int qu(int a){int b=0;for(;a;a-=a&-a)b+=bit[a];return b;} bool done[mn]; long long count_swaps(std::vector<int> s) { int n=s.size(); ll ans=0; int i; for(i=0;i<n;i++){ if(s[i]>0){ pos[s[i]].push(i); } else{ neg[-s[i]].push(i); } } for(i=1;i<mn;i++)up(i,1); int ac=1; for(i=0;i<n;i++){ if(done[i])continue; int p; if(s[i]>0){ ans++; p=neg[s[i]].front(); } else{ p=pos[-s[i]].front(); } ans+=qu(p)-ac; done[p]=1; up(i+1,1); up(p,-1); neg[abs(s[i])].pop(); pos[abs(s[i])].pop(); ac+=2; } return ans; }
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